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HttpListener.Start Method

Allows this instance to receive incoming requests.

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

'Declaration
Public Sub Start
'Usage
Dim instance As HttpListener

instance.Start()

ExceptionCondition
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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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