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HttpListener.Start Method

Note: This method is new in the .NET Framework version 2.0.

Allows this instance to receive incoming requests.

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

public:
void Start ()
public void Start ()
public function Start ()

Exception typeCondition

HttpListenerException

A Win32 function call failed. Check the exception's ErrorCode property to determine the cause of the exception.

ObjectDisposedException

This object is closed.

This method must be called before you call the GetContext or BeginGetContext method.

After you have started an HttpListener object, you can use the Stop method to stop it.

NoteNote

If this listener instance uses https, you must install and select a Server Certificate. Otherwise, an HttpWebRequest query of this HttpListener will fail with an unexpected close of the connection. You can configure Server Certificates and other listener options by using HttpCfg.exe. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/http/http/httpcfg_exe.asp for more details.

Notes to Callers This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example demonstrates using the Start method to begin processing incoming requests.


public static void NonblockingListener(string [] prefixes)
{
    HttpListener listener = new HttpListener();
    foreach (string s in prefixes)
    {
        listener.Prefixes.Add(s);
    }
    listener.Start();
    IAsyncResult result = listener.BeginGetContext(new AsyncCallback(ListenerCallback),listener);
    // Applications can do some work here while waiting for the 
    // request. If no work can be done until you have processed a request,
    // use a wait handle to prevent this thread from terminating
    // while the asynchronous operation completes.
    Console.WriteLine("Waiting for request to be processed asyncronously.");
    result.AsyncWaitHandle.WaitOne();
    Console.WriteLine("Request processed asyncronously.");
    listener.Close();
}

Windows 98, Windows Server 2003, Windows XP Media Center 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

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