Start Method

HttpListener.Start Method ()


Allows this instance to receive incoming requests.

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

public void Start()

Exception Condition

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


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.


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 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 in the .NET Framework.

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)
    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.");
    Console.WriteLine("Request processed asyncronously.");

.NET Framework
Available since 2.0
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