HttpListenerResponse.ContentLength64 Property

Gets or sets the number of bytes in the body data included in the response.

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

public long ContentLength64 { get; set; }

Property Value

Type: System.Int64
The value of the response's Content-Length header.

ExceptionCondition
ArgumentOutOfRangeException

The value specified for a set operation is less than zero.

InvalidOperationException

The response is already being sent.

ObjectDisposedException

This object is closed.

The Content-Length header expresses the length, in bytes, of the response's body data. When using a format that is not send the data chunked or raw, you must set the ContentLength64 property. If you do not, the HttpListener does not send the response data.

For a complete list of response headers, see the HttpResponseHeader enumeration.

The following code example demonstrates setting the value of this property.

// 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();
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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