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HttpListener.IsSupported Property

Gets a value that indicates whether HttpListener can be used with the current operating system.

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

public static bool IsSupported { get; }
/** @property */
public static boolean get_IsSupported ()

public static function get IsSupported () : boolean

Not applicable.

Property Value

true if HttpListener is supported; otherwise, false.

This class is available only on computers running the Windows XP SP2 or Windows Server 2003 operating systems.

The following code example demonstrates the use of the IsSupported property to detect whether an HttpListener object can be used with the current operating system.

// This example requires the System and System.Net namespaces.
public static void SimpleListenerExample(string[] prefixes)
{
    if (!HttpListener.IsSupported)
    {
        Console.WriteLine ("Windows XP SP2 or Server 2003 is required to use the HttpListener class.");
        return;
    }
    // URI prefixes are required,
    // for example "http://contoso.com:8080/index/".
    if (prefixes == null || prefixes.Length == 0)
      throw new ArgumentException("prefixes");
    
    // Create a listener.
    HttpListener listener = new HttpListener();
    // Add the prefixes.
    foreach (string s in prefixes)
    {
        listener.Prefixes.Add(s);
    }
    listener.Start();
    Console.WriteLine("Listening...");
    // Note: The GetContext method blocks while waiting for a request. 
    HttpListenerContext context = listener.GetContext();
    HttpListenerRequest request = context.Request;
    // Obtain a response object.
    HttpListenerResponse response = context.Response;
    // Construct a response.
    string responseString = "<HTML><BODY> Hello world!</BODY></HTML>";
    byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
    // Get a response stream and write the response to it.
    response.ContentLength64 = buffer.Length;
    System.IO.Stream output = response.OutputStream;
    output.Write(buffer,0,buffer.Length);
    // You must close the output stream.
    output.Close();
    listener.Stop();
}

// This example requires the System and System.Net namespaces.
public static void SimpleListenerExample(String prefixes[])
{
    if (!(HttpListener.get_IsSupported())) {
        Console.WriteLine("Windows XP SP2 or Server 2003 is required to " 
            + "use the HttpListener class.");
        return;
    }
    // URI prefixes are required,
    // for example "http://contoso.com:8080/index/".
    if (prefixes == null || prefixes.get_Length() == 0) {
        throw new ArgumentException("prefixes");
    }
    // Create a listener.
    HttpListener listener = new HttpListener();
    // Add the prefixes.
    for (int iCtr = 0; iCtr < prefixes.get_Length(); iCtr++) {
        String s = prefixes[iCtr];
        listener.get_Prefixes().Add(s);
    }
    listener.Start();
    Console.WriteLine("Listening...");
    // Note: The GetContext method blocks while waiting for a request. 
    HttpListenerContext context = listener.GetContext();
    HttpListenerRequest request = context.get_Request();
    // Obtain a response object.
    HttpListenerResponse response = context.get_Response();
    // Construct a response.
    String responseString = "<HTML><BODY> Hello world!</BODY></HTML>";
    ubyte buffer[] = System.Text.Encoding.get_UTF8().GetBytes(responseString);
    // Get a response stream and write the response to it.
    response.set_ContentLength64(buffer.get_Length());
    System.IO.Stream output = response.get_OutputStream();
    output.Write(buffer, 0, buffer.get_Length());
    // You must close the output stream.
    output.Close();
    listener.Stop();
} //SimpleListenerExample

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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