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Home Architecture, security and coding Force the use of a networking adapter using C#
Force the use of a networking adapter using C#
Written by Division by Zero   
Thursday, 12 April 2012 11:03

A while ago I described a problem I had with PHP. I had the same problem using C#. Here's how to force the use of a networking adapter using C#.

// Create a request to a specific url
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("http://www.test.com");
// Add an endPointDelegate
request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);
// Execute the request
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 
// Here's the code of the delegate
private IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
{
    // Fill the byte array with the desired IP-address to force the outgoing request to go to that device
    return new IPEndPoint(new IPAddress(new byte[]{xx,xx,xx,xx}), 0);
}
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