How can I remove item from querystring in asp net using c

Question

I want remove  quot Language quot  querystring from my url  How can I do this   using Asp net 3 5   c   Default aspx Agent 10 amp Language 2  I want to remove  quot Language 2 quot   but language would be the first middle or last  So I will have this Default aspx Agent 20

User · Answer

You re probably going to want use a Regular Expression to find the parameter you want to remove from the querystring  then remove it and redirect the browser to the same file with your new querystring

User · Answer

Parse Querystring into a NameValueCollection  Remove an item  And use the toString to convert it back to a querystring   using System Collections Specialized   NameValueCollection filteredQueryString   System Web HttpUtility ParseQueryString Request QueryString ToString     filteredQueryString Remove  appKey     var queryString        filteredQueryString ToString

User · Answer

Get the querystring collection  parse it into a  name value pair  string  excluding the one you want to REMOVE  and name it newQueryString  Then call Response Redirect known path newqueryString

User · Answer

My personal preference here is rewriting the query or working with a namevaluecollection at a lower point  but there are times where the business logic makes neither of those very helpful and sometimes reflection really is what you need  In those circumstances you can just turn off the readonly flag for a moment like so      reflect to readonly property PropertyInfo isreadonly   typeof System Collections Specialized NameValueCollection  GetProperty  IsReadOnly   BindingFlags Instance   BindingFlags NonPublic       make collection editable isreadonly SetValue this Request QueryString  false  null       remove this Request QueryString Remove  foo        modify this Request QueryString Set  bar    123        make collection readonly again isreadonly SetValue this Request QueryString  true  null

User · Answer

Try this      PropertyInfo isreadonly    typeof System Collections Specialized NameValueCollection  GetProperty  IsReadOnly   BindingFlags Instance   BindingFlags NonPublic        isreadonly SetValue this Request QueryString  false  null   this Request QueryString Remove  foo

User · Answer

Here is a simple way  Reflector is not needed       public static string GetQueryStringWithOutParameter string parameter                var nameValueCollection   System Web HttpUtility ParseQueryString HttpContext Current Request QueryString ToString             nameValueCollection Remove parameter           string url   HttpContext Current Request Path         nameValueCollection           return url          Here QueryString ToString   is required because Request QueryString collection is read only

User · Answer

You don t make it clear whether you re trying to modify the Querystring in place in the Request object   Since that property is read-only  I guess we ll assume you just want to mess with the string       In which case  it s borderline trivial    grab the querystring off the Request  split   it on   amp   put it back together into a new string  while sniffing for and tossing out anything starting with  language

User · Answer

Gather your query string by using HttpContext Request QueryString  It defaults as a NameValueCollection type  Cast it as a string and use System Web HttpUtility ParseQueryString   to parse the query string  which returns a NameValueCollection again   You can then use the Remove   function to remove the specific parameter  using the key to reference that parameter to remove   Use case the query parameters back to a string and use string Join   to format the query string as something readable by your URL as valid query parameters    See below for a working example  where param to remove is the parameter you want to remove   Let s say your query parameters are param1 1 amp param to remove stuff amp param2 2  Run the following lines   var queryParams   System Web HttpUtility ParseQueryString HttpContext Request QueryString ToString     queryParams Remove  param to remove    string queryString   string Join   amp    queryParams Cast lt string gt    Select e   gt  e         queryParams e       Now your query string should be param1 1 amp param2 2

User · Answer

If it s the HttpRequest QueryString then you can copy the collection into a writable collection and have your way with it   NameValueCollection filtered   new NameValueCollection request QueryString   filtered Remove  Language

User · Answer

string queryString    Default aspx Agent 10 amp Language 2     Request QueryString ToString    string parameterToRemove  Language       parameter which we want to remove string regex string Format    amp  0     amp  s    0     amp  s   amp     parameterToRemove   string finalQS   Regex Replace queryString  regex         https   regexr com 3i9vj

User · Answer

well I have a simple solution   but there is a little javascript involve   assuming the Query String is  ok 1       string url   Request Url AbsoluteUri Replace   amp ok 1           url   Request Url AbsoluteUri Replace   ok 1          Response Write   lt script gt window location      url     lt  script gt

User · Answer

Finally   hmemcpy answer was totally for me and thanks to other friends who answered   I grab the HttpValueCollection using Reflector and wrote the following code          var hebe   new HttpValueCollection            hebe Add HttpUtility ParseQueryString Request Url Query             if   string IsNullOrEmpty hebe  Language                 hebe Remove  Language             Response Redirect Request Url AbsolutePath         hebe

User · Answer

I answered a similar question a while ago  Basically  the best way would be to use the class HttpValueCollection  which the QueryString property actually is  unfortunately it is internal in the  NET framework  You could use Reflector to grab it  and place it into your Utils class   This way you could manipulate the query string like a NameValueCollection  but with all the url encoding decoding issues taken care for you   HttpValueCollection extends NameValueCollection  and has a constructor that takes an encoded query string  ampersands and question marks included   and it overrides a ToString   method to later rebuild the query string from the underlying collection

User · Answer

If you have already the Query String as a string  you can also use simple string manipulation   int pos   queryString ToLower   IndexOf  parameter     if  pos  gt   0        int pos end   queryString IndexOf   amp    pos       if  pos end  gt   0       there are additional parameters after this one         queryString   queryString Substring 0  pos    queryString Substring pos end   1       else         if  pos    0     this one is the only parameter             queryString               else           this one is the last parameter             queryString queryString Substring 0  pos - 1

User · Answer

Yes  there are no classes built into  NET to edit query strings   You ll have to either use Regex or some other method of altering the string itself

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