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HttpListenerRequest.QueryString Property

Gets the query string included in the request.

Namespace: System.Net
Assembly: System (in system.dll)

'Declaration
Public ReadOnly Property QueryString As NameValueCollection
'Usage
Dim instance As HttpListenerRequest
Dim value As NameValueCollection

value = instance.QueryString

/** @property */
public NameValueCollection get_QueryString ()

public function get QueryString () : NameValueCollection

Not applicable.

Property Value

A NameValueCollection object that contains the query data included in the request Url.

In a URL, the query information is separated from the path information by a question mark (?). Name/value pairs are separated by an equals sign (=). To access the query data as a single string, get the Query property value from the Uri object returned by Url.

NoteNote:

Queries without an equal sign (example: http://www.contoso.com/query.htm?Name ) are added to the a null reference (Nothing in Visual Basic) key in the NameValueCollection.

The following code example demonstrates using the QueryString property.

public static void ShowRequestProperties1 (HttpListenerRequest request)
{
    // Display the MIME types that can be used in the response.
    string[] types = request.AcceptTypes;
    if (types != null)
    {
        Console.WriteLine("Acceptable MIME types:");
        foreach (string s in types)
        {
            Console.WriteLine(s);
        }
    }
    // Display the language preferences for the response.
    types = request.UserLanguages;
    if (types != null)
    {
        Console.WriteLine("Acceptable natural languages:");
        foreach (string l in types)
        {
            Console.WriteLine(l);
        }
    }
    
    // Display the URL used by the client.
    Console.WriteLine("URL: {0}", request.Url.OriginalString);
    Console.WriteLine("Raw URL: {0}", request.RawUrl);
    Console.WriteLine("Query: {0}", request.QueryString);

    // Display the referring URI.
    Console.WriteLine("Referred by: {0}", request.UrlReferrer);

    //Display the HTTP method.
    Console.WriteLine("HTTP Method: {0}", request.HttpMethod);
    //Display the host information specified by the client;
    Console.WriteLine("Host name: {0}", request.UserHostName);
    Console.WriteLine("Host address: {0}", request.UserHostAddress);
    Console.WriteLine("User agent: {0}", request.UserAgent);
}

public static void ShowRequestProperties1(HttpListenerRequest request)
{
    // Display the MIME types that can be used in the response.
    String types[] = request.get_AcceptTypes();
    if (types != null) {
        Console.WriteLine("Acceptable MIME types:");
        for (int iCtr = 0; iCtr < types.get_Length(); iCtr++) {
            String s = types[iCtr];
            Console.WriteLine(s);
        }
    }
    // Display the language preferences for the response.
    types = request.get_UserLanguages();
    if (types != null) {
        Console.WriteLine("Acceptable natural languages:");
        for (int iCtr = 0; iCtr < types.get_Length(); iCtr++) {
            String l = types[iCtr];
            Console.WriteLine(l);
        }
    }
    // Display the URL used by the client.
    Console.WriteLine("URL: {0}", request.get_Url().get_OriginalString());
    Console.WriteLine("Raw URL: {0}", request.get_RawUrl());
    Console.WriteLine("Query: {0}", request.get_QueryString());
    // Display the referring URI.
    Console.WriteLine("Referred by: {0}", request.get_UrlReferrer());
    //Display the HTTP method.
    Console.WriteLine("HTTP Method: {0}", request.get_HttpMethod());
    //Display the host information specified by the client;
    Console.WriteLine("Host name: {0}", request.get_UserHostName());
    Console.WriteLine("Host address: {0}", request.get_UserHostAddress());
    Console.WriteLine("User agent: {0}", request.get_UserAgent());
} //ShowRequestProperties1

Windows 98, Windows Server 2003, Windows XP Media Center Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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