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copied!<p>The <code>Socket</code> class has the <code>Handle</code> property, which could be used.</p> <p><a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.handle.aspx" rel="noreferrer">Socket.Handle @ MSDN</a></p> <p>I was skeptical about whether this would work, but I was able to get it to work with no fuss at all.</p> <p>To start, I made an unmanaged C++ dll to export a single function that can do something with a socket. Here's the function I created.</p> <pre><code>#include <WinSock.h> // This is an example of an exported function. extern "C" __declspec(dllexport) void __stdcall DoStuffWithSocket(DWORD sock) { const char *data = "woot\r\n"; send((SOCKET)sock, data, strlen(data), 0); } </code></pre> <p>The project outputs a dll named <code>UnmanagedSocketHandler.dll</code>, which is the library mentioned in the P/Invoke signature in the next snippet.</p> <p>Here's a quick and dirty C# console app to call that function as a Server.</p> <pre><code>using System.Net; using System.Net.Sockets; using System.Runtime.InteropServices; namespace SocketHandleShareTest { class Program { static void Main(string[] args) { IPEndPoint ep = new IPEndPoint(IPAddress.Any, 5353); Socket sListen = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); sListen.Bind(ep); sListen.Listen(10); Socket sClient = sListen.Accept(); Console.WriteLine("DoStuffWithSocket() enter"); Console.ReadLine(); DoStuffWithSocket(sClient.Handle); Console.WriteLine("DoStuffWithSocket() exit"); Console.ReadLine(); sClient.Close(); sListen.Close(); Console.WriteLine("Done."); Console.ReadLine(); } [DllImport("UnmanagedSocketHandler.dll")] static extern void DoStuffWithSocket(IntPtr sock); } } </code></pre> <p>Last, a quick and dirty C# client app to talk to the server. I was unable to find any documentation on why this works, but it works. I'd be wary about what you try to do with the socket.</p> <pre><code>using System.Net; using System.Net.Sockets; namespace SocketHandleShareTestClient { class Program { static void Main(string[] args) { byte[] buf = new byte[40]; Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP); s.Connect("localhost", 5353); int len = s.Receive(buf); Console.WriteLine("{0} bytes read.", len); if (len > 0) { string data = Encoding.ASCII.GetString(buf, 0, len); Console.WriteLine(data); } s.Close(); Console.ReadLine(); } } } </code></pre>

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