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HttpRequest.QueryString Property

Gets the collection of HTTP query string variables.

Namespace: System.Web
Assembly: System.Web (in system.web.dll)

public NameValueCollection QueryString { get; }
/** @property */
public NameValueCollection get_QueryString ()

public function get QueryString () : NameValueCollection

Property Value

A NameValueCollection containing the collection of query string variables sent by the client.

The following code example accepts the query string from a client form (with a GET method attribute) and writes out the names and values of each named input element on the form. Place this code on the ASP.NET page referenced by the form's ACTION attribute.

int loop1, loop2;
 
// Load NameValueCollection object.
NameValueCollection coll=Request.QueryString; 
// Get names of all keys into a string array.
String[] arr1 = coll.AllKeys; 
for (loop1 = 0; loop1 < arr1.Length; loop1++) 
{
   Response.Write("Key: " + Server.HtmlEncode(arr1[loop1]) + "<br>");
   String[] arr2 = coll.GetValues(arr1[loop1]);
   for (loop2 = 0; loop2 < arr2.Length; loop2++) 
   {
      Response.Write("Value " + loop2 + ": " + Server.HtmlEncode(arr2[loop2]) + "<br>");
   }
}
   

int loop1, loop2;

// Load NameValueCollection object.
NameValueCollection coll = get_Request().get_QueryString();
// Get names of all keys into a string array.
String arr1[] = coll.get_AllKeys();
for (loop1 = 0; loop1 < arr1.length; loop1++) {
    get_Response().Write(("Key: " + 
        get_Server().HtmlEncode(arr1[loop1]) + "<br>"));
    String arr2[] = coll.GetValues(arr1[loop1]);
    for (loop2 = 0; loop2 < arr2.length; loop2++) {
        get_Response().Write(("Value " + loop2 + ": "
            + get_Server().HtmlEncode(arr2[loop2]) + "<br>"));
    }
}

var arr1, arr2 : String[]
var coll : NameValueCollection

coll=Request.QueryString // Load Form variables into NameValueCollection variable.
arr1 = coll.AllKeys // Get names of all keys into a string array.
for(var i=0; i < arr1.Length; i++){
  Response.Write("Key: " + Server.HtmlEncode(arr1[i]) + "<br>")
  arr2 = coll.GetValues(i)  // Get all values under this key.
  for(var j=0; j < arr2.Length; j++){
      Response.Write("Value " + j + ": " + Server.HtmlEncode(arr2[j]) + "<br><br>")
  }
}
  

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0
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