Path Combine for URLs

Question

Path Combine is handy  but is there a similar function in the  NET framework for URLs   I m looking for syntax like this   Url Combine  http   MyUrl com      Images Image jpg     which would return    http   MyUrl com Images Image jpg

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So I have another approach  similar to everyone who used UriBuilder   I did not want to split my BaseUrl  which can contain a part of the path - e g  http   mybaseurl com dev   as javajavajavajavajava did   The following snippet shows the code   Tests   Beware  This solution lowercases the host and appends a port  If this is not desired  one can write a string representation by e g  leveraging the Uri Property of UriBuilder     public class Tests              public static string CombineUrl  string baseUrl  string path                        var uriBuilder   new UriBuilder  baseUrl              uriBuilder Path   Path Combine  uriBuilder Path  path              return uriBuilder ToString                          TestCase  http   MyUrl com      Images Image jpg    http   myurl com 80 Images Image jpg              TestCase  http   MyUrl com basePath     Images Image jpg    http   myurl com 80 Images Image jpg              TestCase  http   MyUrl com basePath    Images Image jpg    http   myurl com 80 basePath Images Image jpg              TestCase  http   MyUrl com basePath     Images Image jpg    http   myurl com 80 basePath Images Image jpg             public void Test1  string baseUrl  string path  string expected                        var result   CombineUrl  baseUrl  path               Assert That  result  Is EqualTo  expected                     Tested with  NET Core 2 1 on Windows 10   Why does this work   Even though Path Combine will return Backslashes  on Windows atleast   the UriBuilder handles this case in the Setter of Path   Taken from https   github com dotnet corefx blob master src System Private Uri src System UriBuilder cs  mind the call to string Replace    AllowNull  public string Path         get                   return  path                set                   if   value    null      value Length    0                             value                               path   Uri InternalEscapeString value Replace                         changed   true               Is this the best approach   Certainly this solution is pretty self describing  at least in my opinion   But you are relying on undocumented  at least I found nothing with a quick google search   feature  from the  NET API  This may change with a future release so please cover the Method with Tests   There are tests in https   github com dotnet corefx blob master src System Private Uri tests FunctionalTests UriBuilderTests cs  Path Get Set  which check  if the   is correctly transformed   Side Note  One could also work with the UriBuilder Uri property directly  if the uri will be used for a System Uri ctor

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A simple one liner   public static string Combine this string uri1  string uri2    gt     uri1 TrimEnd        uri2 TrimStart           Inspired by  Matt Sharpe s answer

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Recently Combine method was added to Energy Core package  so you might want to use it to join URL parts      string url      url   Energy Base Url Combine  quot https   www youtube com quot    quot watch v NHCgbs3TcYg quot        Console WriteLine url       url   Energy Base Url Combine  quot https   www youtube com quot    quot watch v NHCgbs3TcYg quot    quot t 150 quot        Console WriteLine url    Additionally it will recognize parameter part  so it will work as you might expect  joining path with slash and parameters with ampersand    https   www youtube com watch v NHCgbs3TcYg https   www youtube com watch v NHCgbs3TcYg amp t 150  Documentation for Energy Base Url class Package on NuGet gallery Code sample

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I found that the Uri constructor flips     into      So you can also use Path Combine  with the Uri constructor    Uri baseUri   new Uri  http   MyUrl com     string path   Path Combine  Images    Image jpg     Uri myUri   new Uri baseUri  path

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I created this function that will make your life easier            lt summary gt          The ultimate Path combiner of all time          lt  summary gt           lt param name  IsURL  gt          true - if the paths are Internet URLs  false - if the paths are local URLs  this is very important as this will be used to decide which separator will be used           lt  param gt           lt param name  IsRelative  gt Just adds the separator at the beginning lt  param gt           lt param name  IsFixInternal  gt Fix the paths from within  by removing duplicate separators and correcting the separators  lt  param gt           lt param name  parts  gt The paths to combine lt  param gt           lt returns gt the combined path lt  returns gt      public static string PathCombine bool IsURL   bool IsRelative   bool IsFixInternal   params string   parts                if  parts    null    parts Length    0  return string Empty          char separator   IsURL                        if  parts Length    1  amp  amp  IsFixInternal                        string validsingle              if  IsURL                                validsingle   parts 0  Replace                                        else                               validsingle   parts 0  Replace                                        validsingle   validsingle Trim separator               return  IsRelative   separator ToString     string Empty    validsingle                     string final   parts              Aggregate                            string first   string second    gt                                string validfirst                  string validsecond                  if  IsURL                                        validfirst   first Replace                                  validsecond   second Replace                                                else                                       validfirst   first Replace                                  validsecond   second Replace                                                var prefix   string Empty                  if  IsFixInternal                                        if  IsURL                                                if  validfirst Contains                                                               var tofix   validfirst Substring validfirst IndexOf          3                               prefix   validfirst Replace tofix   string Empty  TrimStart separator                                var tofixlist   tofix Split new     separator     StringSplitOptions RemoveEmptyEntries                                validfirst   separator   string Join separator ToString     tofixlist                                                     else                                                       var firstlist   validfirst Split new     separator     StringSplitOptions RemoveEmptyEntries                               validfirst   string Join separator ToString     firstlist                                                      var secondlist   validsecond Split new     separator     StringSplitOptions RemoveEmptyEntries                           validsecond   string Join separator ToString     secondlist                                             else                                               var firstlist   validfirst Split new     separator     StringSplitOptions RemoveEmptyEntries                           var secondlist   validsecond Split new     separator     StringSplitOptions RemoveEmptyEntries                            validfirst   string Join separator ToString     firstlist                           validsecond   string Join separator ToString     secondlist                                                           return prefix   validfirst Trim separator    separator   validsecond Trim separator                                        return  IsRelative   separator ToString     string Empty    final          It works for URLs as well as normal paths   Usage          Fixes internal paths     Console WriteLine PathCombine true   true   true         folder 1          folder2    folder3           somefile ext                  Result   folder 1 folder2 folder3 somefile ext         Doesn t fix internal paths     Console WriteLine PathCombine true   true   false         folder 1          folder2    folder3           somefile ext                 result    folder 1          folder2    folder3 somefile ext         Don t worry about URL prefixes when fixing internal paths     Console WriteLine PathCombine true   false   true          https       lul com          folder2    folder3           somefile ext                  Result  https   lul com folder2 folder3 somefile ext      Console WriteLine PathCombine false   true   true                            somepath      anotherpath            Result                        somepath anotherpath

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There s already some great answers here  Based on mdsharpe suggestion  here s an extension method that can easily be used when you want to deal with Uri instances   using System  using System Linq   public static class UriExtensions       public static Uri Append this Uri uri  params string   paths                return new Uri paths Aggregate uri AbsoluteUri   current  path    gt  string Format   0   1    current TrimEnd       path TrimStart                    And usage example   var url   new Uri  http   example com subpath    Append   part1     part2   AbsoluteUri    This will produce http   example com subpath part1 part2

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Both of these work     Uri final   new Uri Regex Replace baseUrl         relativePath      lt  http    2              Or    Uri final  new Uri string Format   0   1    baseUrl ToString   TrimEnd       relativePath ToString   TrimStart           I e  if   baseUrl    http   tesrurl test com Int18    and  relativePath    To Folder   output   http   tesrurl test com Int18 To Folder   Some errors will appear for the code below       If you use the below code  some issues will be there in the final URI  Uri final   new Uri baseUrl  relativePath

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This may be a suitably simple solution   public static string Combine string uri1  string uri2        uri1   uri1 TrimEnd           uri2   uri2 TrimStart           return string Format   0   1    uri1  uri2

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This may be a suitably simple solution   public static string Combine string uri1  string uri2        uri1   uri1 TrimEnd           uri2   uri2 TrimStart           return string Format   0   1    uri1  uri2

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Well  I just concatenate two strings and use regular expressions to do the cleaning part       public class UriTool               public static Uri Join string path1  string path2                        string url   path1         path2              url   Regex Replace url      lt  http    2                        return new Uri url                     So  you can use it like this       string path1    http   someaddress com something        string path2     another address html       Uri joinedUri   UriTool Join path1  path2           joinedUri ToString   returns  http   someaddress com something another address html

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Combining multiple parts of a URL could be a little bit tricky  You can use the two-parameter constructor Uri baseUri  relativeUri   or you can use the Uri TryCreate   utility function   In either case  you might end up returning an incorrect result because these methods keep on truncating the relative parts off of the first parameter baseUri  i e  from something like http   google com some thing to http   google com   To be able to combine multiple parts into a final URL  you can copy the two functions below       public static string Combine params string   parts                if  parts    null    parts Length    0  return string Empty           var urlBuilder   new StringBuilder            foreach  var part in parts                        var tempUrl   tryCreateRelativeOrAbsolute part               urlBuilder Append tempUrl                     return VirtualPathUtility RemoveTrailingSlash urlBuilder ToString                private static string tryCreateRelativeOrAbsolute string s                System Uri uri          System Uri TryCreate s  UriKind RelativeOrAbsolute  out uri           string tempUrl   VirtualPathUtility AppendTrailingSlash uri ToString             return tempUrl          Full code with unit tests to demonstrate usage can be found at https   uricombine codeplex com SourceControl latest UriCombine Uri cs  I have unit tests to cover the three most common cases

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I find the following useful and has the following features     Throws on null or white space Takes multiple params parameter for multiple Url segments throws on null or empty   Class  public static class UrlPath      private static string InternalCombine string source  string dest             if  string IsNullOrWhiteSpace source            throw new ArgumentException  Cannot be null or white space   nameof source           if  string IsNullOrWhiteSpace dest            throw new ArgumentException  Cannot be null or white space   nameof dest           return    source TrimEnd              dest TrimStart                        public static string Combine string source  params string   args            gt  args Aggregate source  InternalCombine       Tests  UrlPath Combine  test1    test2    UrlPath Combine  test1      test2    UrlPath Combine  test1     test2        Result   test1 test2  UrlPath Combine   test1                      test2                test3          Result   test1 test2 test3  UrlPath Combine   test1      test2    null   UrlPath Combine       test2     UrlPath Combine   test1    null       Throws an ArgumentException

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Here is my approach and I will use it for myself too   public static string UrlCombine string part1  string part2        string newPart1   string Empty      string newPart2   string Empty      string seperator                If either part1 or part 2 is empty         we don t need to combine with seperator     if  string IsNullOrEmpty part1     string IsNullOrEmpty part2                 seperator   string Empty                If part1 is not empty         remove     at last     if   string IsNullOrEmpty part1                 newPart1   part1 TrimEnd                     If part2 is not empty         remove     at first     if   string IsNullOrEmpty part2                 newPart2   part2 TrimStart                     Now finally combine     return string Format   0  1  2    newPart1  seperator  newPart2

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An easy way to combine them and ensure it s always correct is   string Format   0   1    Url1 Trim       Url2

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Why not just use the following   System IO Path Combine rootUrl  subPath  Replace

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Uri has a constructor that should do this for you  new Uri Uri baseUri  string relativeUri   Here s an example   Uri baseUri   new Uri  http   www contoso com    Uri myUri   new Uri baseUri   catalog shownew htm      Note from editor  Beware  this method does not work as expected  It can cut part of baseUri in some cases  See comments and other answers

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Well  I just concatenate two strings and use regular expressions to do the cleaning part       public class UriTool               public static Uri Join string path1  string path2                        string url   path1         path2              url   Regex Replace url      lt  http    2                        return new Uri url                     So  you can use it like this       string path1    http   someaddress com something        string path2     another address html       Uri joinedUri   UriTool Join path1  path2           joinedUri ToString   returns  http   someaddress com something another address html

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As found in other answers  either new Uri   or TryCreate   can do the tick  However  the base Uri has to end with   and the relative has to NOT begin with    otherwise it will remove the trailing part of the base Url  I think this is best done as an extension method  i e   public static Uri Append this Uri uri  string relativePath        var baseUri   uri AbsoluteUri EndsWith        uri   new Uri uri AbsoluteUri             var relative   relativePath StartsWith        relativePath Substring 1    relativePath      return new Uri baseUri  relative       and to use it   var baseUri   new Uri  http   test com test     var combinedUri    baseUri Append   Do Something      In terms of performance  this consumes more resources than it needs  because of the Uri class which does a lot of parsing and validation  a very rough profiling  Debug  did a million operations in about 2 seconds  This will work for most scenarios  however to be more efficient  it s better to manipulate everything as strings  this takes 125 milliseconds for 1 million operations  I e   public static string Append this Uri uri  string relativePath          avoid the use of Uri as it s not needed  and adds a bit of overhead      var absoluteUri   uri AbsoluteUri    a calculated property  better cache it     var baseUri   absoluteUri EndsWith        absoluteUri   absoluteUri            var relative   relativePath StartsWith        relativePath Substring 1    relativePath      return baseUri   relative      And if you still want to return a URI  it takes around 600 milliseconds for 1 million operations   public static Uri AppendUri this Uri uri  string relativePath          avoid the use of Uri as it s not needed  and adds a bit of overhead      var absoluteUri   uri AbsoluteUri    a calculated property  better cache it     var baseUri   absoluteUri EndsWith        absoluteUri   absoluteUri            var relative   relativePath StartsWith        relativePath Substring 1    relativePath      return new Uri baseUri   relative       I hope this helps

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I think this should give you more flexibility as you can deal with as many path segments as you want    public static string UrlCombine this string baseUrl  params string   segments    gt  string Join      new     baseUrl TrimEnd        Concat segments Select s   gt  s Trim

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Path Combine does not work for me because there can be characters like     in QueryString arguments and therefore the URL  which will result in an ArgumentException   I first tried the new Uri Uri baseUri  string relativeUri  approach  which failed for me because of URIs like http   www mediawiki org wiki Special SpecialPages   new Uri new Uri  http   www mediawiki org wiki      Special SpecialPages     will result in Special SpecialPages  because of the colon after Special that denotes a scheme   So I finally had to take mdsharpe Brian MacKays route and developed it a bit further to work with multiple URI parts   public static string CombineUri params string   uriParts        string uri   string Empty      if  uriParts    null  amp  amp  uriParts Length  gt  0                char   trims   new char                          uri    uriParts 0     string Empty  TrimEnd trims           for  int i   1  i  lt  uriParts Length  i                          uri   string Format   0   1    uri TrimEnd trims    uriParts i     string Empty  TrimStart trims                        return uri      Usage  CombineUri  http   www mediawiki org     wiki    Special SpecialPages

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Rules while combining URLs with a URI  To avoid strange behaviour there s one rule to follow    The path  directory  must end with      If the path ends without      the last part is treated like a file-name  and it ll be concatenated when trying to combine with the next URL part  There s one exception  the base URL address  without directory info  needs not to end with     the path part must not start with      If it start with      every existing relative information from URL is dropped   adding a string Empty part path will remove the relative directory from the URL too    If you follow rules above  you can combine URLs with the code below  Depending on your situation  you can add multiple  directory  parts to the URL             var pathParts   new string     destinationBaseUrl  destinationFolderUrl  fileName             var destination   pathParts Aggregate  left  right    gt                        if  string IsNullOrWhiteSpace right                   return left               return new Uri new Uri left   right  ToString

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I created this function that will make your life easier            lt summary gt          The ultimate Path combiner of all time          lt  summary gt           lt param name  IsURL  gt          true - if the paths are Internet URLs  false - if the paths are local URLs  this is very important as this will be used to decide which separator will be used           lt  param gt           lt param name  IsRelative  gt Just adds the separator at the beginning lt  param gt           lt param name  IsFixInternal  gt Fix the paths from within  by removing duplicate separators and correcting the separators  lt  param gt           lt param name  parts  gt The paths to combine lt  param gt           lt returns gt the combined path lt  returns gt      public static string PathCombine bool IsURL   bool IsRelative   bool IsFixInternal   params string   parts                if  parts    null    parts Length    0  return string Empty          char separator   IsURL                        if  parts Length    1  amp  amp  IsFixInternal                        string validsingle              if  IsURL                                validsingle   parts 0  Replace                                        else                               validsingle   parts 0  Replace                                        validsingle   validsingle Trim separator               return  IsRelative   separator ToString     string Empty    validsingle                     string final   parts              Aggregate                            string first   string second    gt                                string validfirst                  string validsecond                  if  IsURL                                        validfirst   first Replace                                  validsecond   second Replace                                                else                                       validfirst   first Replace                                  validsecond   second Replace                                                var prefix   string Empty                  if  IsFixInternal                                        if  IsURL                                                if  validfirst Contains                                                               var tofix   validfirst Substring validfirst IndexOf          3                               prefix   validfirst Replace tofix   string Empty  TrimStart separator                                var tofixlist   tofix Split new     separator     StringSplitOptions RemoveEmptyEntries                                validfirst   separator   string Join separator ToString     tofixlist                                                     else                                                       var firstlist   validfirst Split new     separator     StringSplitOptions RemoveEmptyEntries                               validfirst   string Join separator ToString     firstlist                                                      var secondlist   validsecond Split new     separator     StringSplitOptions RemoveEmptyEntries                           validsecond   string Join separator ToString     secondlist                                             else                                               var firstlist   validfirst Split new     separator     StringSplitOptions RemoveEmptyEntries                           var secondlist   validsecond Split new     separator     StringSplitOptions RemoveEmptyEntries                            validfirst   string Join separator ToString     firstlist                           validsecond   string Join separator ToString     secondlist                                                           return prefix   validfirst Trim separator    separator   validsecond Trim separator                                        return  IsRelative   separator ToString     string Empty    final          It works for URLs as well as normal paths   Usage          Fixes internal paths     Console WriteLine PathCombine true   true   true         folder 1          folder2    folder3           somefile ext                  Result   folder 1 folder2 folder3 somefile ext         Doesn t fix internal paths     Console WriteLine PathCombine true   true   false         folder 1          folder2    folder3           somefile ext                 result    folder 1          folder2    folder3 somefile ext         Don t worry about URL prefixes when fixing internal paths     Console WriteLine PathCombine true   false   true          https       lul com          folder2    folder3           somefile ext                  Result  https   lul com folder2 folder3 somefile ext      Console WriteLine PathCombine false   true   true                            somepath      anotherpath            Result                        somepath anotherpath

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Use       private Uri UriCombine string path1  string path2  string path3       string path4                     string path   System IO Path Combine path1  path2 TrimStart             path3 TrimStart             path4 TrimStart                      string url   path Replace                    return new Uri url           It has the benefit of behaving exactly like Path Combine

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Based on the sample URL you provided  I m going to assume you want to combine URLs that are relative to your site   Based on this assumption I ll propose this solution as the most appropriate response to your question which was   Path Combine is handy  is there a similar function in the framework for URLs    Since there the is a similar function in the framework for URLs I propose the correct is   VirtualPathUtility Combine  method  Here s the MSDN reference link  VirtualPathUtility Combine Method  There is one caveat  I believe this only works for URLs relative to your site  that is  you cannot use it to generate links to another web site  For example  var url   VirtualPathUtility Combine  www google com    accounts widgets

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I found that the Uri constructor flips     into      So you can also use Path Combine  with the Uri constructor    Uri baseUri   new Uri  http   MyUrl com     string path   Path Combine  Images    Image jpg     Uri myUri   new Uri baseUri  path

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Combining multiple parts of a URL could be a little bit tricky  You can use the two-parameter constructor Uri baseUri  relativeUri   or you can use the Uri TryCreate   utility function   In either case  you might end up returning an incorrect result because these methods keep on truncating the relative parts off of the first parameter baseUri  i e  from something like http   google com some thing to http   google com   To be able to combine multiple parts into a final URL  you can copy the two functions below       public static string Combine params string   parts                if  parts    null    parts Length    0  return string Empty           var urlBuilder   new StringBuilder            foreach  var part in parts                        var tempUrl   tryCreateRelativeOrAbsolute part               urlBuilder Append tempUrl                     return VirtualPathUtility RemoveTrailingSlash urlBuilder ToString                private static string tryCreateRelativeOrAbsolute string s                System Uri uri          System Uri TryCreate s  UriKind RelativeOrAbsolute  out uri           string tempUrl   VirtualPathUtility AppendTrailingSlash uri ToString             return tempUrl          Full code with unit tests to demonstrate usage can be found at https   uricombine codeplex com SourceControl latest UriCombine Uri cs  I have unit tests to cover the three most common cases

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I found UriBuilder worked really well for this sort of thing   UriBuilder urlb   new UriBuilder  http    serverAddress   webPort   filePath   Uri url   urlb Uri  return url AbsoluteUri    See UriBuilder Class - MSDN for more constructors and documentation

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Recently Combine method was added to Energy Core package  so you might want to use it to join URL parts      string url      url   Energy Base Url Combine  quot https   www youtube com quot    quot watch v NHCgbs3TcYg quot        Console WriteLine url       url   Energy Base Url Combine  quot https   www youtube com quot    quot watch v NHCgbs3TcYg quot    quot t 150 quot        Console WriteLine url    Additionally it will recognize parameter part  so it will work as you might expect  joining path with slash and parameters with ampersand    https   www youtube com watch v NHCgbs3TcYg https   www youtube com watch v NHCgbs3TcYg amp t 150  Documentation for Energy Base Url class Package on NuGet gallery Code sample

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My generic solution   public static string Combine params string   uriParts        string uri   string Empty      if  uriParts    null  amp  amp  uriParts Any                  char   trims   new char                          uri    uriParts 0     string Empty  TrimEnd trims            for  int i   1  i  lt  uriParts Length  i                          uri   string Format   0   1    uri TrimEnd trims    uriParts i     string Empty  TrimStart trims                         return uri

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Based on the sample URL you provided  I m going to assume you want to combine URLs that are relative to your site   Based on this assumption I ll propose this solution as the most appropriate response to your question which was   Path Combine is handy  is there a similar function in the framework for URLs    Since there the is a similar function in the framework for URLs I propose the correct is   VirtualPathUtility Combine  method  Here s the MSDN reference link  VirtualPathUtility Combine Method  There is one caveat  I believe this only works for URLs relative to your site  that is  you cannot use it to generate links to another web site  For example  var url   VirtualPathUtility Combine  www google com    accounts widgets

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You use Uri TryCreate           Uri result   null   if  Uri TryCreate new Uri  http   msdn microsoft com en-us library       en-us library system uri trycreate aspx   out result         Console WriteLine result       Will return      http   msdn microsoft com en-us library system uri trycreate aspx

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Use this   public static class WebPath       public static string Combine params string   args                var prefixAdjusted   args Select x   gt  x StartsWith       amp  amp   x StartsWith  http     x Substring 1    x           return string Join      prefixAdjusted

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If you don t want to have a dependency like Flurl  you can use its source code           lt summary gt          Basically a Path Combine for URLs  Ensures exactly one     separates each segment          and exactly on   amp amp   separates each query parameter          URL-encodes illegal characters but not reserved characters           lt  summary gt           lt param name  quot parts quot  gt URL parts to combine  lt  param gt      public static string Combine params string   parts            if  parts    null              throw new ArgumentNullException nameof parts             string result    quot  quot           bool inQuery   false  inFragment   false           string CombineEnsureSingleSeparator string a  string b  char separator                if  string IsNullOrEmpty a   return b              if  string IsNullOrEmpty b   return a              return a TrimEnd separator    separator   b TrimStart separator                      foreach  var part in parts                if  string IsNullOrEmpty part                   continue               if  result EndsWith  quot   quot      part StartsWith  quot   quot                    result   CombineEnsureSingleSeparator result  part                    else if  result EndsWith  quot   quot      part StartsWith  quot   quot                    result   CombineEnsureSingleSeparator result  part                    else if  inFragment                  result    part              else if  inQuery                  result   CombineEnsureSingleSeparator result  part    amp                 else                 result   CombineEnsureSingleSeparator result  part                     if  part Contains  quot   quot                      inQuery   false                  inFragment   true                            else if   inFragment  amp  amp  part Contains  quot   quot                      inQuery   true                                  return EncodeIllegalCharacters result                   lt summary gt          URL-encodes characters in a string that are neither reserved nor unreserved  Avoids encoding reserved characters such as     and      Avoids encoding     if it begins a  -hex-hex sequence  i e  avoids double-encoding            lt  summary gt           lt param name  quot s quot  gt The string to encode  lt  param gt           lt param name  quot encodeSpaceAsPlus quot  gt If true  spaces will be encoded as   signs  Otherwise  they ll be encoded as  20  lt  param gt           lt returns gt The encoded URL  lt  returns gt      public static string EncodeIllegalCharacters string s  bool encodeSpaceAsPlus   false            if  string IsNullOrEmpty s               return s           if  encodeSpaceAsPlus              s   s Replace  quot   quot    quot   quot                Uri EscapeUriString mostly does what we want - encodes illegal characters only - but it has a quirk            in that   isn t illegal if it s the start of a  -encoded sequence https   stackoverflow com a 47636037 62600             no   characters  so avoid the regex overhead         if   s Contains  quot   quot                return Uri EscapeUriString s               pick out all  -hex-hex matches and avoid double-encoding          return Regex Replace s   quot          0-9A-Fa-f  2      quot   c   gt                var a   c Groups 1  Value     group 1 is a sequence with no  -encoding - encode illegal characters             var b   c Groups 2  Value     group 2 is a valid 3-character  -encoded sequence - leave it alone              return Uri EscapeUriString a    b

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I find the following useful and has the following features     Throws on null or white space Takes multiple params parameter for multiple Url segments throws on null or empty   Class  public static class UrlPath      private static string InternalCombine string source  string dest             if  string IsNullOrWhiteSpace source            throw new ArgumentException  Cannot be null or white space   nameof source           if  string IsNullOrWhiteSpace dest            throw new ArgumentException  Cannot be null or white space   nameof dest           return    source TrimEnd              dest TrimStart                        public static string Combine string source  params string   args            gt  args Aggregate source  InternalCombine       Tests  UrlPath Combine  test1    test2    UrlPath Combine  test1      test2    UrlPath Combine  test1     test2        Result   test1 test2  UrlPath Combine   test1                      test2                test3          Result   test1 test2 test3  UrlPath Combine   test1      test2    null   UrlPath Combine       test2     UrlPath Combine   test1    null       Throws an ArgumentException

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Path Combine  Http   MyUrl com      Images Image jpg   Replace

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Ryan Cook s answer is close to what I m after and may be more appropriate for other developers  However  it adds http    to the beginning of the string and in general it does a bit more formatting than I m after   Also  for my use cases  resolving relative paths is not important   mdsharp s answer also contains the seed of a good idea  although that actual implementation needed a few more details to be complete  This is an attempt to flesh it out  and I m using this in production    C   public string UrlCombine string url1  string url2        if  url1 Length    0            return url2             if  url2 Length    0            return url1             url1   url1 TrimEnd                 url2   url2 TrimStart                  return string Format   0   1    url1  url2       VB NET  Public Function UrlCombine ByVal url1 As String  ByVal url2 As String  As String     If url1 Length   0 Then         Return url2     End If      If url2 Length   0 Then         Return url1     End If      url1   url1 TrimEnd    c     c      url2   url2 TrimStart    c     c       Return String Format   0   1    url1  url2  End Function   This code passes the following test  which happens to be in VB    lt TestMethod   gt  Public Sub UrlCombineTest       Dim target As StringHelpers   New StringHelpers        Assert IsTrue target UrlCombine  test1    test2      test1 test2       Assert IsTrue target UrlCombine  test1     test2      test1 test2       Assert IsTrue target UrlCombine  test1     test2      test1 test2       Assert IsTrue target UrlCombine  test1      test2      test1 test2       Assert IsTrue target UrlCombine   test1      test2        test1 test2        Assert IsTrue target UrlCombine       test2        test2        Assert IsTrue target UrlCombine   test1            test1    End Sub

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I have combined all the previous answers       public static string UrlPathCombine string path1  string path2                path1   path1 TrimEnd                     path2   path2 TrimStart                return Path Combine path1  path2               Replace Path DirectorySeparatorChar  Path AltDirectorySeparatorChar               TestMethod      public void TestUrl                 const string P1    http   msdn microsoft com slash library             Assert AreEqual  http   msdn microsoft com slash library site aspx   UrlPathCombine P1     site aspx              var path   UrlPathCombine  Http   MyUrl com     Images Image jpg             Assert AreEqual               Http   MyUrl com Images Image jpg               path

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I found UriBuilder worked really well for this sort of thing   UriBuilder urlb   new UriBuilder  http    serverAddress   webPort   filePath   Uri url   urlb Uri  return url AbsoluteUri    See UriBuilder Class - MSDN for more constructors and documentation

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You use Uri TryCreate           Uri result   null   if  Uri TryCreate new Uri  http   msdn microsoft com en-us library       en-us library system uri trycreate aspx   out result         Console WriteLine result       Will return      http   msdn microsoft com en-us library system uri trycreate aspx

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Why not just use the following   System IO Path Combine rootUrl  subPath  Replace

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I just put together a small extension method   public static string UriCombine  this string val  string append                        if  String IsNullOrEmpty val   return append              if  String IsNullOrEmpty append   return val              return val TrimEnd              append TrimStart                   It can be used like this    www example com   UriCombine   images   UriCombine  first jpeg

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An easy way to combine them and ensure it s always correct is   string Format   0   1    Url1 Trim       Url2

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Witty example  Ryan  to end with a link to the function  Well done   One recommendation Brian  if you wrap this code in a function  you may want to use a UriBuilder to wrap the base URL prior to the TryCreate call   Otherwise  the base URL MUST include the scheme  where the UriBuilder will assume http      Just a thought   public string CombineUrl string baseUrl  string relativeUrl        UriBuilder baseUri   new UriBuilder baseUrl       Uri newUri       if  Uri TryCreate baseUri Uri  relativeUrl  out newUri           return newUri ToString        else         throw new ArgumentException  Unable to combine specified url values

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Rules while combining URLs with a URI  To avoid strange behaviour there s one rule to follow    The path  directory  must end with      If the path ends without      the last part is treated like a file-name  and it ll be concatenated when trying to combine with the next URL part  There s one exception  the base URL address  without directory info  needs not to end with     the path part must not start with      If it start with      every existing relative information from URL is dropped   adding a string Empty part path will remove the relative directory from the URL too    If you follow rules above  you can combine URLs with the code below  Depending on your situation  you can add multiple  directory  parts to the URL             var pathParts   new string     destinationBaseUrl  destinationFolderUrl  fileName             var destination   pathParts Aggregate  left  right    gt                        if  string IsNullOrWhiteSpace right                   return left               return new Uri new Uri left   right  ToString

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For what it s worth  here a couple of extension methods   The first one will combine paths and the second one adds parameters to the URL       public static string CombineUrl this string root  string path  params string   paths                if  string IsNullOrWhiteSpace path                         return root                     Uri baseUri   new Uri root           Uri combinedPaths   new Uri baseUri  path            foreach  string extendedPath in paths                       combinedPaths   new Uri combinedPaths  extendedPath                      return combinedPaths AbsoluteUri             public static string AddUrlParams this string url  Dictionary lt string  string gt  parameters                if  parameters    null     parameters Keys Any                          return url                     var tempUrl   new StringBuilder    url              int count   0           foreach  KeyValuePair lt string  string gt  parameter in parameters                        if  count  gt  0                                tempUrl Append   amp                                tempUrl Append    WebUtility UrlEncode parameter Key    WebUtility UrlEncode parameter Value                  count                       return tempUrl ToString

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If you don t want to add a third-party dependency such as Flurl or create a custom extension method  in ASP NET Core  also available in Microsoft Owin   you can use PathString which is intended for the purpose of building up URI paths  You can then create your full URI using a combination of this  Uri and UriBuilder   In this case  it would be   new Uri new UriBuilder  http    MyUrl com   Uri  new PathString   Images   Add   Image jpg   ToString      This gives you all the constituent parts without having to specify the separators in the base URL  Unfortunately  PathString requires that   is prepended to each string otherwise it in fact throws an ArgumentException  But at least you can build up your URI deterministically in a way that is easily unit-testable

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There is a Todd Menier s comment above that Flurl includes a Url Combine      More details      Url Combine is basically a Path Combine for URLs  ensuring one   and only one separator character between parts    var url   Url Combine       http   MyUrl com          too      many      slashes         too    few         x 1    y 2     result   http   www MyUrl com too many slashes too few x 1 amp y 2     Get Flurl Http on NuGet   PM  Install-Package Flurl Http  Or get the stand-alone URL builder without the HTTP features   PM  Install-Package Flurl

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Witty example  Ryan  to end with a link to the function  Well done   One recommendation Brian  if you wrap this code in a function  you may want to use a UriBuilder to wrap the base URL prior to the TryCreate call   Otherwise  the base URL MUST include the scheme  where the UriBuilder will assume http      Just a thought   public string CombineUrl string baseUrl  string relativeUrl        UriBuilder baseUri   new UriBuilder baseUrl       Uri newUri       if  Uri TryCreate baseUri Uri  relativeUrl  out newUri           return newUri ToString        else         throw new ArgumentException  Unable to combine specified url values

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If you don t want to have a dependency like Flurl  you can use its source code           lt summary gt          Basically a Path Combine for URLs  Ensures exactly one     separates each segment          and exactly on   amp amp   separates each query parameter          URL-encodes illegal characters but not reserved characters           lt  summary gt           lt param name  quot parts quot  gt URL parts to combine  lt  param gt      public static string Combine params string   parts            if  parts    null              throw new ArgumentNullException nameof parts             string result    quot  quot           bool inQuery   false  inFragment   false           string CombineEnsureSingleSeparator string a  string b  char separator                if  string IsNullOrEmpty a   return b              if  string IsNullOrEmpty b   return a              return a TrimEnd separator    separator   b TrimStart separator                      foreach  var part in parts                if  string IsNullOrEmpty part                   continue               if  result EndsWith  quot   quot      part StartsWith  quot   quot                    result   CombineEnsureSingleSeparator result  part                    else if  result EndsWith  quot   quot      part StartsWith  quot   quot                    result   CombineEnsureSingleSeparator result  part                    else if  inFragment                  result    part              else if  inQuery                  result   CombineEnsureSingleSeparator result  part    amp                 else                 result   CombineEnsureSingleSeparator result  part                     if  part Contains  quot   quot                      inQuery   false                  inFragment   true                            else if   inFragment  amp  amp  part Contains  quot   quot                      inQuery   true                                  return EncodeIllegalCharacters result                   lt summary gt          URL-encodes characters in a string that are neither reserved nor unreserved  Avoids encoding reserved characters such as     and      Avoids encoding     if it begins a  -hex-hex sequence  i e  avoids double-encoding            lt  summary gt           lt param name  quot s quot  gt The string to encode  lt  param gt           lt param name  quot encodeSpaceAsPlus quot  gt If true  spaces will be encoded as   signs  Otherwise  they ll be encoded as  20  lt  param gt           lt returns gt The encoded URL  lt  returns gt      public static string EncodeIllegalCharacters string s  bool encodeSpaceAsPlus   false            if  string IsNullOrEmpty s               return s           if  encodeSpaceAsPlus              s   s Replace  quot   quot    quot   quot                Uri EscapeUriString mostly does what we want - encodes illegal characters only - but it has a quirk            in that   isn t illegal if it s the start of a  -encoded sequence https   stackoverflow com a 47636037 62600             no   characters  so avoid the regex overhead         if   s Contains  quot   quot                return Uri EscapeUriString s               pick out all  -hex-hex matches and avoid double-encoding          return Regex Replace s   quot          0-9A-Fa-f  2      quot   c   gt                var a   c Groups 1  Value     group 1 is a sequence with no  -encoding - encode illegal characters             var b   c Groups 2  Value     group 2 is a valid 3-character  -encoded sequence - leave it alone              return Uri EscapeUriString a    b

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We use the following simple helper method to join an arbitrary number of URL parts together   public static string JoinUrlParts params string   urlParts        return string Join      urlParts Where up   gt   string IsNullOrEmpty up   ToList   Select up   gt  up Trim       ToArray         Note  that it doesn t support        something page htm -style relative URLs

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There is a Todd Menier s comment above that Flurl includes a Url Combine      More details      Url Combine is basically a Path Combine for URLs  ensuring one   and only one separator character between parts    var url   Url Combine       http   MyUrl com          too      many      slashes         too    few         x 1    y 2     result   http   www MyUrl com too many slashes too few x 1 amp y 2     Get Flurl Http on NuGet   PM  Install-Package Flurl Http  Or get the stand-alone URL builder without the HTTP features   PM  Install-Package Flurl

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If you don t want to add a third-party dependency such as Flurl or create a custom extension method  in ASP NET Core  also available in Microsoft Owin   you can use PathString which is intended for the purpose of building up URI paths  You can then create your full URI using a combination of this  Uri and UriBuilder   In this case  it would be   new Uri new UriBuilder  http    MyUrl com   Uri  new PathString   Images   Add   Image jpg   ToString      This gives you all the constituent parts without having to specify the separators in the base URL  Unfortunately  PathString requires that   is prepended to each string otherwise it in fact throws an ArgumentException  But at least you can build up your URI deterministically in a way that is easily unit-testable

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Ryan Cook s answer is close to what I m after and may be more appropriate for other developers  However  it adds http    to the beginning of the string and in general it does a bit more formatting than I m after   Also  for my use cases  resolving relative paths is not important   mdsharp s answer also contains the seed of a good idea  although that actual implementation needed a few more details to be complete  This is an attempt to flesh it out  and I m using this in production    C   public string UrlCombine string url1  string url2        if  url1 Length    0            return url2             if  url2 Length    0            return url1             url1   url1 TrimEnd                 url2   url2 TrimStart                  return string Format   0   1    url1  url2       VB NET  Public Function UrlCombine ByVal url1 As String  ByVal url2 As String  As String     If url1 Length   0 Then         Return url2     End If      If url2 Length   0 Then         Return url1     End If      url1   url1 TrimEnd    c     c      url2   url2 TrimStart    c     c       Return String Format   0   1    url1  url2  End Function   This code passes the following test  which happens to be in VB    lt TestMethod   gt  Public Sub UrlCombineTest       Dim target As StringHelpers   New StringHelpers        Assert IsTrue target UrlCombine  test1    test2      test1 test2       Assert IsTrue target UrlCombine  test1     test2      test1 test2       Assert IsTrue target UrlCombine  test1     test2      test1 test2       Assert IsTrue target UrlCombine  test1      test2      test1 test2       Assert IsTrue target UrlCombine   test1      test2        test1 test2        Assert IsTrue target UrlCombine       test2        test2        Assert IsTrue target UrlCombine   test1            test1    End Sub

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Use       private Uri UriCombine string path1  string path2  string path3       string path4                     string path   System IO Path Combine path1  path2 TrimStart             path3 TrimStart             path4 TrimStart                      string url   path Replace                    return new Uri url           It has the benefit of behaving exactly like Path Combine

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I just put together a small extension method   public static string UriCombine  this string val  string append                        if  String IsNullOrEmpty val   return append              if  String IsNullOrEmpty append   return val              return val TrimEnd              append TrimStart                   It can be used like this    www example com   UriCombine   images   UriCombine  first jpeg

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My generic solution   public static string Combine params string   uriParts        string uri   string Empty      if  uriParts    null  amp  amp  uriParts Any                  char   trims   new char                          uri    uriParts 0     string Empty  TrimEnd trims            for  int i   1  i  lt  uriParts Length  i                          uri   string Format   0   1    uri TrimEnd trims    uriParts i     string Empty  TrimStart trims                         return uri

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You use Uri TryCreate           Uri result   null   if  Uri TryCreate new Uri  http   msdn microsoft com en-us library       en-us library system uri trycreate aspx   out result         Console WriteLine result       Will return      http   msdn microsoft com en-us library system uri trycreate aspx

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Path Combine  Http   MyUrl com      Images Image jpg   Replace

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For what it s worth  here a couple of extension methods   The first one will combine paths and the second one adds parameters to the URL       public static string CombineUrl this string root  string path  params string   paths                if  string IsNullOrWhiteSpace path                         return root                     Uri baseUri   new Uri root           Uri combinedPaths   new Uri baseUri  path            foreach  string extendedPath in paths                       combinedPaths   new Uri combinedPaths  extendedPath                      return combinedPaths AbsoluteUri             public static string AddUrlParams this string url  Dictionary lt string  string gt  parameters                if  parameters    null     parameters Keys Any                          return url                     var tempUrl   new StringBuilder    url              int count   0           foreach  KeyValuePair lt string  string gt  parameter in parameters                        if  count  gt  0                                tempUrl Append   amp                                tempUrl Append    WebUtility UrlEncode parameter Key    WebUtility UrlEncode parameter Value                  count                       return tempUrl ToString

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For anyone who is looking for a one-liner and simply wants to join parts of a path without creating a new method or referencing a new library or construct a URI value and convert that to a string  then     string urlToImage   String Join       websiteUrl    folder1    folder2    folder3    item      It s pretty basic  but I don t see what more you need  If you re afraid of doubled     then you can simply do a  Replace            afterward  If you re afraid of replacing the doubled      in  https      then instead do one join  replace the doubled      then join the website url  however I m pretty sure most browsers will automatically convert anything with  https   in the front of it to read in the correct format   This would look like   string urlToImage   String Join      websiteUrl   String Join       folder1    folder2    folder3    item   Replace               There are plenty of answers here that will handle all the above  but in my case  I only needed it once in one location and won t need to heavily rely on it  Also  it s really easy to see what is going on here   See  https   docs microsoft com en-us dotnet api system string join view netframework-4 8

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I have combined all the previous answers       public static string UrlPathCombine string path1  string path2                path1   path1 TrimEnd                     path2   path2 TrimStart                return Path Combine path1  path2               Replace Path DirectorySeparatorChar  Path AltDirectorySeparatorChar               TestMethod      public void TestUrl                 const string P1    http   msdn microsoft com slash library             Assert AreEqual  http   msdn microsoft com slash library site aspx   UrlPathCombine P1     site aspx              var path   UrlPathCombine  Http   MyUrl com     Images Image jpg             Assert AreEqual               Http   MyUrl com Images Image jpg               path

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There s already some great answers here  Based on mdsharpe suggestion  here s an extension method that can easily be used when you want to deal with Uri instances   using System  using System Linq   public static class UriExtensions       public static Uri Append this Uri uri  params string   paths                return new Uri paths Aggregate uri AbsoluteUri   current  path    gt  string Format   0   1    current TrimEnd       path TrimStart                    And usage example   var url   new Uri  http   example com subpath    Append   part1     part2   AbsoluteUri    This will produce http   example com subpath part1 part2

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Uri has a constructor that should do this for you  new Uri Uri baseUri  string relativeUri   Here s an example   Uri baseUri   new Uri  http   www contoso com    Uri myUri   new Uri baseUri   catalog shownew htm      Note from editor  Beware  this method does not work as expected  It can cut part of baseUri in some cases  See comments and other answers

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Both of these work     Uri final   new Uri Regex Replace baseUrl         relativePath      lt  http    2              Or    Uri final  new Uri string Format   0   1    baseUrl ToString   TrimEnd       relativePath ToString   TrimStart           I e  if   baseUrl    http   tesrurl test com Int18    and  relativePath    To Folder   output   http   tesrurl test com Int18 To Folder   Some errors will appear for the code below       If you use the below code  some issues will be there in the final URI  Uri final   new Uri baseUrl  relativePath

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I think this should give you more flexibility as you can deal with as many path segments as you want    public static string UrlCombine this string baseUrl  params string   segments    gt  string Join      new     baseUrl TrimEnd        Concat segments Select s   gt  s Trim

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Use this   public static class WebPath       public static string Combine params string   args                var prefixAdjusted   args Select x   gt  x StartsWith       amp  amp   x StartsWith  http     x Substring 1    x           return string Join      prefixAdjusted

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I haven t used the following code yet  but found it during my internet travels to solve a URL combine problem - hoping it s a succinct  and successful   answer   VirtualPathUtility Combine

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A simple one liner   public static string Combine this string uri1  string uri2    gt     uri1 TrimEnd        uri2 TrimStart           Inspired by  Matt Sharpe s answer

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I have to point out that Path Combine appears to work for this also directly  at least on  NET nbsp 4

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So I have another approach  similar to everyone who used UriBuilder   I did not want to split my BaseUrl  which can contain a part of the path - e g  http   mybaseurl com dev   as javajavajavajavajava did   The following snippet shows the code   Tests   Beware  This solution lowercases the host and appends a port  If this is not desired  one can write a string representation by e g  leveraging the Uri Property of UriBuilder     public class Tests              public static string CombineUrl  string baseUrl  string path                        var uriBuilder   new UriBuilder  baseUrl              uriBuilder Path   Path Combine  uriBuilder Path  path              return uriBuilder ToString                          TestCase  http   MyUrl com      Images Image jpg    http   myurl com 80 Images Image jpg              TestCase  http   MyUrl com basePath     Images Image jpg    http   myurl com 80 Images Image jpg              TestCase  http   MyUrl com basePath    Images Image jpg    http   myurl com 80 basePath Images Image jpg              TestCase  http   MyUrl com basePath     Images Image jpg    http   myurl com 80 basePath Images Image jpg             public void Test1  string baseUrl  string path  string expected                        var result   CombineUrl  baseUrl  path               Assert That  result  Is EqualTo  expected                     Tested with  NET Core 2 1 on Windows 10   Why does this work   Even though Path Combine will return Backslashes  on Windows atleast   the UriBuilder handles this case in the Setter of Path   Taken from https   github com dotnet corefx blob master src System Private Uri src System UriBuilder cs  mind the call to string Replace    AllowNull  public string Path         get                   return  path                set                   if   value    null      value Length    0                             value                               path   Uri InternalEscapeString value Replace                         changed   true               Is this the best approach   Certainly this solution is pretty self describing  at least in my opinion   But you are relying on undocumented  at least I found nothing with a quick google search   feature  from the  NET API  This may change with a future release so please cover the Method with Tests   There are tests in https   github com dotnet corefx blob master src System Private Uri tests FunctionalTests UriBuilderTests cs  Path Get Set  which check  if the   is correctly transformed   Side Note  One could also work with the UriBuilder Uri property directly  if the uri will be used for a System Uri ctor

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Here s Microsoft s  OfficeDev PnP  method UrlUtility Combine       const char PATH DELIMITER                  lt summary gt          Combines a path and a relative path           lt  summary gt           lt param name  path  gt  lt  param gt           lt param name  relative  gt  lt  param gt           lt returns gt  lt  returns gt      public static string Combine string path  string relative                 if relative    null              relative   String Empty           if path    null              path   String Empty           if relative Length    0  amp  amp  path Length    0              return String Empty           if relative Length    0              return path           if path Length    0              return relative           path   path Replace       PATH DELIMITER           relative   relative Replace       PATH DELIMITER            return path TrimEnd PATH DELIMITER    PATH DELIMITER   relative TrimStart PATH DELIMITER           Source  GitHub

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I used this code to solve the problem   string   brokenBaseUrl   Context Url TrimEnd      Split       string   brokenRootFolderPath   RootFolderPath Split        for  int x   0  x  lt  brokenRootFolderPath Length  x            if url doesn t already contain member  append it to the end of the string with   in front     if   brokenBaseUrl Contains brokenRootFolderPath x                  if  x    0                        RootLocationUrl   Context Url TrimEnd                         else                       RootLocationUrl    String Format    0    brokenRootFolderPath x

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For anyone who is looking for a one-liner and simply wants to join parts of a path without creating a new method or referencing a new library or construct a URI value and convert that to a string  then     string urlToImage   String Join       websiteUrl    folder1    folder2    folder3    item      It s pretty basic  but I don t see what more you need  If you re afraid of doubled     then you can simply do a  Replace            afterward  If you re afraid of replacing the doubled      in  https      then instead do one join  replace the doubled      then join the website url  however I m pretty sure most browsers will automatically convert anything with  https   in the front of it to read in the correct format   This would look like   string urlToImage   String Join      websiteUrl   String Join       folder1    folder2    folder3    item   Replace               There are plenty of answers here that will handle all the above  but in my case  I only needed it once in one location and won t need to heavily rely on it  Also  it s really easy to see what is going on here   See  https   docs microsoft com en-us dotnet api system string join view netframework-4 8

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We use the following simple helper method to join an arbitrary number of URL parts together   public static string JoinUrlParts params string   urlParts        return string Join      urlParts Where up   gt   string IsNullOrEmpty up   ToList   Select up   gt  up Trim       ToArray         Note  that it doesn t support        something page htm -style relative URLs

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Here s Microsoft s  OfficeDev PnP  method UrlUtility Combine       const char PATH DELIMITER                  lt summary gt          Combines a path and a relative path           lt  summary gt           lt param name  path  gt  lt  param gt           lt param name  relative  gt  lt  param gt           lt returns gt  lt  returns gt      public static string Combine string path  string relative                 if relative    null              relative   String Empty           if path    null              path   String Empty           if relative Length    0  amp  amp  path Length    0              return String Empty           if relative Length    0              return path           if path Length    0              return relative           path   path Replace       PATH DELIMITER           relative   relative Replace       PATH DELIMITER            return path TrimEnd PATH DELIMITER    PATH DELIMITER   relative TrimStart PATH DELIMITER           Source  GitHub

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I used this code to solve the problem   string   brokenBaseUrl   Context Url TrimEnd      Split       string   brokenRootFolderPath   RootFolderPath Split        for  int x   0  x  lt  brokenRootFolderPath Length  x            if url doesn t already contain member  append it to the end of the string with   in front     if   brokenBaseUrl Contains brokenRootFolderPath x                  if  x    0                        RootLocationUrl   Context Url TrimEnd                         else                       RootLocationUrl    String Format    0    brokenRootFolderPath x

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I haven t used the following code yet  but found it during my internet travels to solve a URL combine problem - hoping it s a succinct  and successful   answer   VirtualPathUtility Combine

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Path Combine does not work for me because there can be characters like     in QueryString arguments and therefore the URL  which will result in an ArgumentException   I first tried the new Uri Uri baseUri  string relativeUri  approach  which failed for me because of URIs like http   www mediawiki org wiki Special SpecialPages   new Uri new Uri  http   www mediawiki org wiki      Special SpecialPages     will result in Special SpecialPages  because of the colon after Special that denotes a scheme   So I finally had to take mdsharpe Brian MacKays route and developed it a bit further to work with multiple URI parts   public static string CombineUri params string   uriParts        string uri   string Empty      if  uriParts    null  amp  amp  uriParts Length  gt  0                char   trims   new char                          uri    uriParts 0     string Empty  TrimEnd trims           for  int i   1  i  lt  uriParts Length  i                          uri   string Format   0   1    uri TrimEnd trims    uriParts i     string Empty  TrimStart trims                        return uri      Usage  CombineUri  http   www mediawiki org     wiki    Special SpecialPages

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You use Uri TryCreate           Uri result   null   if  Uri TryCreate new Uri  http   msdn microsoft com en-us library       en-us library system uri trycreate aspx   out result         Console WriteLine result       Will return      http   msdn microsoft com en-us library system uri trycreate aspx

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I have to point out that Path Combine appears to work for this also directly  at least on  NET nbsp 4

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As found in other answers  either new Uri   or TryCreate   can do the tick  However  the base Uri has to end with   and the relative has to NOT begin with    otherwise it will remove the trailing part of the base Url  I think this is best done as an extension method  i e   public static Uri Append this Uri uri  string relativePath        var baseUri   uri AbsoluteUri EndsWith        uri   new Uri uri AbsoluteUri             var relative   relativePath StartsWith        relativePath Substring 1    relativePath      return new Uri baseUri  relative       and to use it   var baseUri   new Uri  http   test com test     var combinedUri    baseUri Append   Do Something      In terms of performance  this consumes more resources than it needs  because of the Uri class which does a lot of parsing and validation  a very rough profiling  Debug  did a million operations in about 2 seconds  This will work for most scenarios  however to be more efficient  it s better to manipulate everything as strings  this takes 125 milliseconds for 1 million operations  I e   public static string Append this Uri uri  string relativePath          avoid the use of Uri as it s not needed  and adds a bit of overhead      var absoluteUri   uri AbsoluteUri    a calculated property  better cache it     var baseUri   absoluteUri EndsWith        absoluteUri   absoluteUri            var relative   relativePath StartsWith        relativePath Substring 1    relativePath      return baseUri   relative      And if you still want to return a URI  it takes around 600 milliseconds for 1 million operations   public static Uri AppendUri this Uri uri  string relativePath          avoid the use of Uri as it s not needed  and adds a bit of overhead      var absoluteUri   uri AbsoluteUri    a calculated property  better cache it     var baseUri   absoluteUri EndsWith        absoluteUri   absoluteUri            var relative   relativePath StartsWith        relativePath Substring 1    relativePath      return new Uri baseUri   relative       I hope this helps

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Here is my approach and I will use it for myself too   public static string UrlCombine string part1  string part2        string newPart1   string Empty      string newPart2   string Empty      string seperator                If either part1 or part 2 is empty         we don t need to combine with seperator     if  string IsNullOrEmpty part1     string IsNullOrEmpty part2                 seperator   string Empty                If part1 is not empty         remove     at last     if   string IsNullOrEmpty part1                 newPart1   part1 TrimEnd                     If part2 is not empty         remove     at first     if   string IsNullOrEmpty part2                 newPart2   part2 TrimStart                     Now finally combine     return string Format   0  1  2    newPart1  seperator  newPart2

[c#] Path.Combine for URLs?

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