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HttpRequest.QueryString Property

.NET Framework 4.5

Gets the collection of HTTP query string variables.

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

public NameValueCollection QueryString { get; }

Property Value

Type: System.Collections.Specialized.NameValueCollection
A NameValueCollection containing the collection of query string variables sent by the client. For example, If the request URL is http://www.contoso.com/default.aspx?id=44 then the value of QueryString is "id=44".

Examples

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>");
   }
}

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Reference

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