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    <p>You can write a multi threaded pipe server by repeatedly creating a NamedPipeServerStream and waiting for one connection, then spawning a thread for that instance of NamedPipeServerStream. </p> <p>You can only have 254 concurrent clients though according to the .NET MSDN documentation linked below. For Win32 APIs though you can pass a special value to get unlimited based on system resources. It seems the MSDN documentation is wrong as noted below. </p> <p>The below code is not tested so please do not simply copy and paste for production use without testing:</p> <pre><code> public class PipeServer { bool running; Thread runningThread; EventWaitHandle terminateHandle = new EventWaitHandle(false, EventResetMode.AutoReset); public string PipeName { get; set; } void ServerLoop() { while (running) { ProcessNextClient(); } terminateHandle.Set(); } public void Run() { running = true; runningThread = new Thread(ServerLoop); runningThread.Start(); } public void Stop() { running = false; terminateHandle.WaitOne(); } public virtual string ProcessRequest(string message) { return ""; } public void ProcessClientThread(object o) { NamedPipeServerStream pipeStream = (NamedPipeServerStream)o; //TODO FOR YOU: Write code for handling pipe client here pipeStream.Close(); pipeStream.Dispose(); } public void ProcessNextClient() { try { NamedPipeServerStream pipeStream = new NamedPipeServerStream(PipeName, PipeDirection.InOut, 254); pipeStream.WaitForConnection(); //Spawn a new thread for each request and continue waiting Thread t = new Thread(ProcessClientThread); t.Start(pipeStream); } catch (Exception e) {//If there are no more avail connections (254 is in use already) then just keep looping until one is avail } } </code></pre>
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    1. USBrian R. Bondy
    1. USBrian R. Bondy
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    1. CO@Brian: Why do you say "you can only have 254 concurrent clients"? By default, NamedPipeServerStream specifies PIPE_UNLIMITED_INSTANCES when calling Win32 CreateNamedPipe API, and Win32 documentation says `the number of pipe instances that can be created is limited only by the availability of system resources`.
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      1. USChris Dickson
    2. CO`ArgumentOutOfRangeException` is thrown when `maxNumberofServerInstances is less than one or greater than 254. http://msdn.microsoft.com/en-us/library/bb355105.aspx
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    3. CO@Brian: The documentation for the NamedPipeServerStream ctor lies. The value `-1`, corresponding to `PIPE_UNLIMITED_INSTANCES`, is also an acceptable value. `if (((maxNumberOfServerInstances < 1) || (maxNumberOfServerInstances > 0xfe)) && (maxNumberOfServerInstances != -1)) { throw new ArgumentOutOfRangeException("maxNumberOfServerInstances", SR.GetString("ArgumentOutOfRange_MaxNumServerInstances")); } `
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