How do you UrlEncode without using System Web

Question

I am trying to write a windows client application that calls a web site for data  To keep the install to a minimum I am trying only use dlls in the  NET Framework Client Profile  Trouble is that I need to UrlEncode some parameters  is there an easy way to do this without importing System Web dll which is not part of the Client Pofile

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The answers here are very good  but still insufficient for me   I wrote a small loop that compares Uri EscapeUriString with Uri EscapeDataString for all characters from 0 to 255   NOTE  Both functions have the built-in intelligence that characters above 0x80 are first UTF-8 encoded and then percent encoded   Here is the result           Different              - gt  Uri     Data   23      - gt  Uri     Data   24    amp   - gt  Uri   amp   Data   26      - gt  Uri     Data   2B      - gt  Uri     Data   2C      - gt  Uri     Data   2F      - gt  Uri     Data   3A      - gt  Uri     Data   3B      - gt  Uri     Data   3D      - gt  Uri     Data   3F      - gt  Uri     Data   40            Not escaped              - gt  Uri     Data         - gt  Uri     Data         - gt  Uri     Data         - gt  Uri     Data         - gt  Uri     Data      -  - gt  Uri  -  Data  -      - gt  Uri     Data         - gt  Uri     Data         - gt  Uri     Data       0  - gt  Uri  0  Data  0         9  - gt  Uri  9  Data  9    A  - gt  Uri  A  Data  A          Z  - gt  Uri  Z  Data  Z    a  - gt  Uri  a  Data  a         z  - gt  Uri  z  Data  z           UTF 8                     - gt  Uri   C3 92  Data   C3 92       - gt  Uri   C3 93  Data   C3 93       - gt  Uri   C3 94  Data   C3 94       - gt  Uri   C3 95  Data   C3 95       - gt  Uri   C3 96  Data   C3 96          EscapeUriString is to be used to encode URLs  while EscapeDataString is to be used to encode for example the content of a Cookie  because Cookie data must not contain the reserved characters     and

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There s a client profile usable version  System Net WebUtility class  present in client profile System dll  Here s the MSDN Link   WebUtility

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Here s an example of sending a POST request that properly encodes parameters using  application x-www-form-urlencoded content type   using  var client   new WebClient          var values   new NameValueCollection                  param1    value1                param2    value2                var result   client UploadValues  http   foo com   values

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In  Net 4 5  use WebUtility  Just for formatting I m submitting this as an answer   Couldn t find any good examples comparing them so   string testString    http   test  space 123 text var val amp another two   Console WriteLine  UrlEncode              System Web HttpUtility UrlEncode testString    Console WriteLine  EscapeUriString        Uri EscapeUriString testString    Console WriteLine  EscapeDataString       Uri EscapeDataString testString    Console WriteLine  EscapeDataReplace      Uri EscapeDataString testString  Replace   20           Console WriteLine  HtmlEncode             System Web HttpUtility HtmlEncode testString    Console WriteLine  UrlPathEncode          System Web HttpUtility UrlPathEncode testString        Net 4 0  Console WriteLine  WebUtility HtmlEncode      WebUtility HtmlEncode testString       Net 4 5  Console WriteLine  WebUtility UrlEncode       WebUtility UrlEncode testString      Outputs   UrlEncode              http 3a 2f 2ftest 23 space 123 2ftext 3fvar 3dval 26another 3dtwo EscapeUriString        http   test  20space 20123 text var val amp another two EscapeDataString       http 3A 2F 2Ftest 23 20space 20123 2Ftext 3Fvar 3Dval 26another 3Dtwo EscapeDataReplace      http 3A 2F 2Ftest 23 space 123 2Ftext 3Fvar 3Dval 26another 3Dtwo  HtmlEncode             http   test  space 123 text var val amp amp another two UrlPathEncode          http   test  20space 20123 text var val amp another two     Net 4 0  WebUtility HtmlEncode  http   test  space 123 text var val amp amp another two    Net 4 5  WebUtility UrlEncode   http 3A 2F 2Ftest 23 space 123 2Ftext 3Fvar 3Dval 26another 3Dtwo   In  Net 4 5  use WebUtility UrlEncode  This appears to replicate HttpUtility UrlEncode  pre-v4 0  for the more common characters  Uri EscapeDataString testString  Replace   20        Replace        27   Replace        7E   Note  EscapeUriString will keep a valid uri string  which causes it to use as many plaintext characters as possible   See this answer for a Table Comparing the various Encodings  https   stackoverflow com a 11236038 555798  Line Breaks All of them listed here  other than HttpUtility HtmlEncode  will convert   n r  into  0a 0d or  0A 0D  Please feel free to edit this and add new characters to my test string  or leave them in the comments and I ll edit it

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System Net WebUtility HtmlDecode

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To UrlEncode without using System Web   String s   System Net WebUtility UrlEncode str     fix some different between WebUtility UrlEncode and HttpUtility UrlEncode s   Regex Replace s      0-9A-F  2     c   gt  c Value ToLowerInvariant       more details  https   www samnoble co uk 2014 05 21 beware-webutility-urlencode-vs-httputility-urlencode

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System Uri EscapeUriString   can be problematic with certain characters  for me it was a number   pound     sign in the string   If that is an issue for you  try   System Uri EscapeDataString     Works excellent with individual values   Here is a SO question answer that explains the difference   What  39 s the difference between EscapeUriString and EscapeDataString   and recommends to use Uri EscapeDataString   in any aspect

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You can use  Uri EscapeUriString  see http   msdn microsoft com en-us library system uri escapeuristring aspx

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