How to parse a query string into a NameValueCollection in NET

Question

I would like to parse a string such as p1 6 amp p2 7 amp p3 8 into a NameValueCollection   What is the most elegant way of doing this when you don t have access to the Page Request object

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private void button1 Click  object sender  EventArgs e                 string s     p1 6 amp p2 7 amp p3 8           NameValueCollection nvc   new NameValueCollection             foreach   string vp in Regex Split  s    amp                             string   singlePair   Regex Split  vp                     if   singlePair Length    2                                 nvc Add  singlePair  0    singlePair  1

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Hit up Request QueryString Keys for a NameValueCollection of all query string parameters

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let search   window location search   console log search    let qString   search substring 1    while qString indexOf          -1      qString    qString replace            let qArray   qString split   amp      let values        for let i   0  i  lt  qArray length  i        let pos   qArray i  search          let keyVal   qArray i  substring 0  pos      let dataVal   qArray i  substring pos   1      dataVal   decodeURIComponent dataVal      values keyVal    dataVal

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A lot of the answers are providing custom examples because of the accepted answer s dependency on System Web  From the Microsoft AspNet WebApi Client NuGet package there is a UriExtensions ParseQueryString  method that can also be used   var uri   new Uri  https   stackoverflow com a 22167748 p1 6 amp p2 7 amp p3 8    NameValueCollection query   uri ParseQueryString      So if you want to avoid the System Web dependency and don t want to roll your own  this is a good option

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private void button1 Click  object sender  EventArgs e                 string s     p1 6 amp p2 7 amp p3 8           NameValueCollection nvc   new NameValueCollection             foreach   string vp in Regex Split  s    amp                             string   singlePair   Regex Split  vp                     if   singlePair Length    2                                 nvc Add  singlePair  0    singlePair  1

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There s a built-in  NET utility for this   HttpUtility ParseQueryString     C  NameValueCollection qscoll   HttpUtility ParseQueryString querystring       VB NET Dim qscoll As NameValueCollection   HttpUtility ParseQueryString querystring    You may need to replace querystring with new Uri fullUrl  Query

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I translate to C  version of josh-brown in VB  private System Collections Specialized NameValueCollection ParseQueryString Uri uri        var result   new System Collections Specialized NameValueCollection 4       var query   uri Query      if   String IsNullOrEmpty query                 var pairs   query Substring 1  Split   amp   ToCharArray             foreach  var pair in pairs                        var parts   pair Split     ToCharArray    2               var name   System Uri UnescapeDataString parts 0                var value    parts Length    1    String Empty   System Uri UnescapeDataString parts 1                result Add name  value                       return result

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I wanted to remove the dependency on System Web so that I could parse the query string of a ClickOnce deployment  while having the prerequisites limited to the  Client-only Framework Subset    I liked rp s answer   I added some additional logic   public static NameValueCollection ParseQueryString string s                NameValueCollection nvc   new NameValueCollection                remove anything other than query string from url         if s Contains                             s   s Substring s IndexOf        1                      foreach  string vp in Regex Split s    amp                           string   singlePair   Regex Split vp                    if  singlePair Length    2                                nvc Add singlePair 0   singlePair 1                              else                                  only one key with no value specified in query string                 nvc Add singlePair 0   string Empty                                    return nvc

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HttpUtility ParseQueryString will work as long as you are in a web app or don t mind including a dependency on System Web  Another way to do this is   NameValueCollection queryParameters   new NameValueCollection    string   querySegments   queryString Split   amp     foreach string segment in querySegments       string   parts   segment Split          if  parts Length  gt  0             string key   parts 0  Trim new char                        string val   parts 1  Trim           queryParameters Add key  val

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var q   Request QueryString          NameValueCollection qscoll   HttpUtility ParseQueryString q ToString

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HttpUtility ParseQueryString will work as long as you are in a web app or don t mind including a dependency on System Web  Another way to do this is   NameValueCollection queryParameters   new NameValueCollection    string   querySegments   queryString Split   amp     foreach string segment in querySegments       string   parts   segment Split          if  parts Length  gt  0             string key   parts 0  Trim new char                        string val   parts 1  Trim           queryParameters Add key  val

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I needed a function that is a little more versatile than what was provided already when working with OLSC queries    Values may contain multiple equal signs Decode encoded characters in both name and value Capable of running on Client Framework Capable of running on Mobile Framework    Here is my solution   Public Shared Function ParseQueryString ByVal uri As Uri  As System Collections Specialized NameValueCollection     Dim result   New System Collections Specialized NameValueCollection 4      Dim query   uri Query     If Not String IsNullOrEmpty query  Then         Dim pairs   query Substring 1  Split   amp  c          For Each pair In pairs             Dim parts   pair Split     c   2               Dim name   System Uri UnescapeDataString parts 0               Dim value   If parts Length   1  String Empty                  System Uri UnescapeDataString parts 1                 result Add name  value          Next     End If     Return result End Function   It may not be a bad idea to tack  lt Extension   gt  on that too to add the capability to Uri itself

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let search   window location search   console log search    let qString   search substring 1    while qString indexOf          -1      qString    qString replace            let qArray   qString split   amp      let values        for let i   0  i  lt  qArray length  i        let pos   qArray i  search          let keyVal   qArray i  substring 0  pos      let dataVal   qArray i  substring pos   1      dataVal   decodeURIComponent dataVal      values keyVal    dataVal

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If you want to avoid the dependency on System Web that is required to use HttpUtility ParseQueryString  you could use the Uri extension method ParseQueryString found in System Net Http   Make sure to add a reference  if you haven t already   to System Net Http in your project   Note that you have to convert the response body to a valid Uri so that ParseQueryString  in System Net Http works   string body    value1 randomvalue1 amp value2 randomValue2        http   localhost query   is added to the string  body  in order to create a valid Uri  string urlBody    http   localhost query     body  NameValueCollection coll   new Uri urlBody  ParseQueryString

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I just realized that Web API Client has a ParseQueryString extension method that works on a Uri and returns a HttpValueCollection   var parameters   uri ParseQueryString    string foo   parameters  foo

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There s a built-in  NET utility for this   HttpUtility ParseQueryString     C  NameValueCollection qscoll   HttpUtility ParseQueryString querystring       VB NET Dim qscoll As NameValueCollection   HttpUtility ParseQueryString querystring    You may need to replace querystring with new Uri fullUrl  Query

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Since everyone seems to be pasting his solution   here s mine  -  I needed this from within a class library without System Web to fetch id parameters from stored hyperlinks   Thought I d share because I find this solution faster and better looking   public static class Statics     public static Dictionary lt string  string gt  QueryParse string url                Dictionary lt string  string gt  qDict   new Dictionary lt string  string gt             foreach  string qPair in url Substring url IndexOf        1  Split   amp                           string   qVal   qPair Split                   qDict Add qVal 0   Uri UnescapeDataString qVal 1                       return qDict             public static string QueryGet string url  string param                var qDict   QueryParse url           return qDict param             Usage   Statics QueryGet url   id

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To do this without System Web  without writing it yourself  and without additional NuGet packages    Add a reference to System Net Http Formatting Add using System Net Http  Use this code   new Uri uri  ParseQueryString      https   msdn microsoft com en-us library system net http uriextensions v vs 118  aspx

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There s a built-in  NET utility for this   HttpUtility ParseQueryString     C  NameValueCollection qscoll   HttpUtility ParseQueryString querystring       VB NET Dim qscoll As NameValueCollection   HttpUtility ParseQueryString querystring    You may need to replace querystring with new Uri fullUrl  Query

User · Answer

private void button1 Click  object sender  EventArgs e                 string s     p1 6 amp p2 7 amp p3 8           NameValueCollection nvc   new NameValueCollection             foreach   string vp in Regex Split  s    amp                             string   singlePair   Regex Split  vp                     if   singlePair Length    2                                 nvc Add  singlePair  0    singlePair  1

User · Answer

To do this without System Web  without writing it yourself  and without additional NuGet packages    Add a reference to System Net Http Formatting Add using System Net Http  Use this code   new Uri uri  ParseQueryString      https   msdn microsoft com en-us library system net http uriextensions v vs 118  aspx

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If you don t want the System Web dependency  just paste this source code from HttpUtility class   I just whipped this together from the source code of Mono  It contains the HttpUtility and all it s dependencies  like IHtmlString  Helpers  HttpEncoder  HttpQSCollection    Then use HttpUtility ParseQueryString   https   gist github com bjorn-ali-goransson b04a7c44808bb2de8cca3fc9a3762f9c

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A lot of the answers are providing custom examples because of the accepted answer s dependency on System Web  From the Microsoft AspNet WebApi Client NuGet package there is a UriExtensions ParseQueryString  method that can also be used   var uri   new Uri  https   stackoverflow com a 22167748 p1 6 amp p2 7 amp p3 8    NameValueCollection query   uri ParseQueryString      So if you want to avoid the System Web dependency and don t want to roll your own  this is a good option

User · Answer

I translate to C  version of josh-brown in VB  private System Collections Specialized NameValueCollection ParseQueryString Uri uri        var result   new System Collections Specialized NameValueCollection 4       var query   uri Query      if   String IsNullOrEmpty query                 var pairs   query Substring 1  Split   amp   ToCharArray             foreach  var pair in pairs                        var parts   pair Split     ToCharArray    2               var name   System Uri UnescapeDataString parts 0                var value    parts Length    1    String Empty   System Uri UnescapeDataString parts 1                result Add name  value                       return result

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var q   Request QueryString          NameValueCollection qscoll   HttpUtility ParseQueryString q ToString

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Hit up Request QueryString Keys for a NameValueCollection of all query string parameters

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Just access Request QueryString  AllKeys mentioned as another answer just gets you an array of keys

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This is my code  I think it s very useful    public String GetQueryString string ItemToRemoveOrInsert   null  string InsertValue   null         System Collections Specialized NameValueCollection filtered   new System Collections Specialized NameValueCollection Request QueryString       if  ItemToRemoveOrInsert    null                filtered Remove ItemToRemoveOrInsert           if   string IsNullOrWhiteSpace InsertValue                         filtered Add ItemToRemoveOrInsert  InsertValue                        string StrQr   string Join   amp    filtered AllKeys Select key   gt  key         filtered key   ToArray         if   string IsNullOrWhiteSpace StrQr            StrQr       StrQr             return StrQr

User · Answer

Just access Request QueryString  AllKeys mentioned as another answer just gets you an array of keys

User · Answer

HttpUtility ParseQueryString will work as long as you are in a web app or don t mind including a dependency on System Web  Another way to do this is   NameValueCollection queryParameters   new NameValueCollection    string   querySegments   queryString Split   amp     foreach string segment in querySegments       string   parts   segment Split          if  parts Length  gt  0             string key   parts 0  Trim new char                        string val   parts 1  Trim           queryParameters Add key  val

User · Answer

If you don t want the System Web dependency  just paste this source code from HttpUtility class   I just whipped this together from the source code of Mono  It contains the HttpUtility and all it s dependencies  like IHtmlString  Helpers  HttpEncoder  HttpQSCollection    Then use HttpUtility ParseQueryString   https   gist github com bjorn-ali-goransson b04a7c44808bb2de8cca3fc9a3762f9c

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HttpUtility ParseQueryString Request Url Query  return is HttpValueCollection  internal class   It inherits from NameValueCollection       var qs   HttpUtility ParseQueryString Request Url Query       qs Remove  foo          string url      Default aspx        if  qs Count  gt  0         url   url         qs ToString         Response Redirect url

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To get all Querystring values try this       Dim qscoll As NameValueCollection   HttpUtility ParseQueryString querystring   Dim sb As New StringBuilder   lt br   gt    For Each s As String In qscoll AllKeys    Response Write s  amp    -    amp  qscoll s   amp    lt br   gt     Next s

User · Answer

Just access Request QueryString  AllKeys mentioned as another answer just gets you an array of keys

User · Answer

I needed a function that is a little more versatile than what was provided already when working with OLSC queries    Values may contain multiple equal signs Decode encoded characters in both name and value Capable of running on Client Framework Capable of running on Mobile Framework    Here is my solution   Public Shared Function ParseQueryString ByVal uri As Uri  As System Collections Specialized NameValueCollection     Dim result   New System Collections Specialized NameValueCollection 4      Dim query   uri Query     If Not String IsNullOrEmpty query  Then         Dim pairs   query Substring 1  Split   amp  c          For Each pair In pairs             Dim parts   pair Split     c   2               Dim name   System Uri UnescapeDataString parts 0               Dim value   If parts Length   1  String Empty                  System Uri UnescapeDataString parts 1                 result Add name  value          Next     End If     Return result End Function   It may not be a bad idea to tack  lt Extension   gt  on that too to add the capability to Uri itself

User · Answer

I wanted to remove the dependency on System Web so that I could parse the query string of a ClickOnce deployment  while having the prerequisites limited to the  Client-only Framework Subset    I liked rp s answer   I added some additional logic   public static NameValueCollection ParseQueryString string s                NameValueCollection nvc   new NameValueCollection                remove anything other than query string from url         if s Contains                             s   s Substring s IndexOf        1                      foreach  string vp in Regex Split s    amp                           string   singlePair   Regex Split vp                    if  singlePair Length    2                                nvc Add singlePair 0   singlePair 1                              else                                  only one key with no value specified in query string                 nvc Add singlePair 0   string Empty                                    return nvc

User · Answer

HttpUtility ParseQueryString Request Url Query  return is HttpValueCollection  internal class   It inherits from NameValueCollection       var qs   HttpUtility ParseQueryString Request Url Query       qs Remove  foo          string url      Default aspx        if  qs Count  gt  0         url   url         qs ToString         Response Redirect url

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To get all Querystring values try this       Dim qscoll As NameValueCollection   HttpUtility ParseQueryString querystring   Dim sb As New StringBuilder   lt br   gt    For Each s As String In qscoll AllKeys    Response Write s  amp    -    amp  qscoll s   amp    lt br   gt     Next s

User · Answer

I just realized that Web API Client has a ParseQueryString extension method that works on a Uri and returns a HttpValueCollection   var parameters   uri ParseQueryString    string foo   parameters  foo

User · Answer

HttpUtility ParseQueryString will work as long as you are in a web app or don t mind including a dependency on System Web  Another way to do this is   NameValueCollection queryParameters   new NameValueCollection    string   querySegments   queryString Split   amp     foreach string segment in querySegments       string   parts   segment Split          if  parts Length  gt  0             string key   parts 0  Trim new char                        string val   parts 1  Trim           queryParameters Add key  val

User · Answer

Since everyone seems to be pasting his solution   here s mine  -  I needed this from within a class library without System Web to fetch id parameters from stored hyperlinks   Thought I d share because I find this solution faster and better looking   public static class Statics     public static Dictionary lt string  string gt  QueryParse string url                Dictionary lt string  string gt  qDict   new Dictionary lt string  string gt             foreach  string qPair in url Substring url IndexOf        1  Split   amp                           string   qVal   qPair Split                   qDict Add qVal 0   Uri UnescapeDataString qVal 1                       return qDict             public static string QueryGet string url  string param                var qDict   QueryParse url           return qDict param             Usage   Statics QueryGet url   id

User · Answer

Just access Request QueryString  AllKeys mentioned as another answer just gets you an array of keys

User · Answer

If you want to avoid the dependency on System Web that is required to use HttpUtility ParseQueryString  you could use the Uri extension method ParseQueryString found in System Net Http   Make sure to add a reference  if you haven t already   to System Net Http in your project   Note that you have to convert the response body to a valid Uri so that ParseQueryString  in System Net Http works   string body    value1 randomvalue1 amp value2 randomValue2        http   localhost query   is added to the string  body  in order to create a valid Uri  string urlBody    http   localhost query     body  NameValueCollection coll   new Uri urlBody  ParseQueryString

User · Answer

Hit up Request QueryString Keys for a NameValueCollection of all query string parameters

User · Answer

Hit up Request QueryString Keys for a NameValueCollection of all query string parameters

User · Answer

private void button1 Click  object sender  EventArgs e                 string s     p1 6 amp p2 7 amp p3 8           NameValueCollection nvc   new NameValueCollection             foreach   string vp in Regex Split  s    amp                             string   singlePair   Regex Split  vp                     if   singlePair Length    2                                 nvc Add  singlePair  0    singlePair  1

User · Answer

This is my code  I think it s very useful    public String GetQueryString string ItemToRemoveOrInsert   null  string InsertValue   null         System Collections Specialized NameValueCollection filtered   new System Collections Specialized NameValueCollection Request QueryString       if  ItemToRemoveOrInsert    null                filtered Remove ItemToRemoveOrInsert           if   string IsNullOrWhiteSpace InsertValue                         filtered Add ItemToRemoveOrInsert  InsertValue                        string StrQr   string Join   amp    filtered AllKeys Select key   gt  key         filtered key   ToArray         if   string IsNullOrWhiteSpace StrQr            StrQr       StrQr             return StrQr

User · Answer

There s a built-in  NET utility for this   HttpUtility ParseQueryString     C  NameValueCollection qscoll   HttpUtility ParseQueryString querystring       VB NET Dim qscoll As NameValueCollection   HttpUtility ParseQueryString querystring    You may need to replace querystring with new Uri fullUrl  Query

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