特别注意

项目是.net4.7.1以上的版本。我需要的是.net4.0的版本，因此对版本.net的版本进行降级。这个项目用到.net4.7.1的RuntimeInformation的API:

if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
    socket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, false);
}

我的项目只在window上运行，因此直接去除判断。

Fleck

Fleck is a WebSocket server implementation in C#. Branched from the Nugget project, Fleck requires no inheritance, container, or additional references.

Example

The following is an example that will echo to a client.

var server = new WebSocketServer("ws://0.0.0.0:8181");
server.Start(socket =>
{
  socket.OnOpen = () => Console.WriteLine("Open!");
  socket.OnClose = () => Console.WriteLine("Close!");
  socket.OnMessage = message => socket.Send(message);
});
        

Supported WebSocket Versions

Fleck supports several WebSocket versions of modern web browsers

• Hixie-Draft-76/Hybi-00 (Safari 5, Chrome < 14, Firefox 4 (when enabled))
• Hybi-07 (Firefox 6)
• Hybi-10 (Chrome 14-16, Firefox 7)
• Hybi-13 (Chrome 17+)

Secure WebSockets (wss://)

Enabling secure connections requires two things: using the scheme wss instead of ws, and pointing Fleck to an x509 certificate containing a public and private key

var server = new WebSocketServer("wss://0.0.0.0:8431");
server.Certificate = new X509Certificate2("MyCert.pfx");
server.Start(socket =>
{
  //...use as normal
});

SubProtocol Negotiation

To enable negotiation of subprotocols, specify the supported protocols on the WebSocketServer.SupportedSubProtocols property. The negotiated subprotocol will be available on the socket's ConnectionInfo.NegotiatedSubProtocol.

If no supported subprotocols are found on the client request (the Sec-WebSocket-Protocol header), the connection will be closed.

var server = new WebSocketServer("ws://0.0.0.0:8181");
server.SupportedSubProtocols = new []{ "superchat", "chat" };
server.Start(socket =>
{
  //socket.ConnectionInfo.NegotiatedSubProtocol is populated
});

Custom Logging

Fleck can log into Log4Net or any other third party logging system. Just override the FleckLog.LogAction property with the desired behavior.

ILog logger = LogManager.GetLogger(typeof(FleckLog));

FleckLog.LogAction = (level, message, ex) => {
  switch(level) {
    case LogLevel.Debug:
      logger.Debug(message, ex);
      break;
    case LogLevel.Error:
      logger.Error(message, ex);
      break;
    case LogLevel.Warn:
      logger.Warn(message, ex);
      break;
    default:
      logger.Info(message, ex);
      break;
  }
};

Disable Nagle's Algorithm

Set NoDelay to true on the WebSocketConnection.ListenerSocket

var server = new WebSocketServer("ws://0.0.0.0:8181");
server.ListenerSocket.NoDelay = true;
server.Start(socket =>
{
  //Child connections will not use Nagle's Algorithm
});

Auto Restart After Listen Error

Set RestartAfterListenError to true on the WebSocketConnection

var server = new WebSocketServer("ws://0.0.0.0:8181");
server.RestartAfterListenError = true;
server.Start(socket =>
{
  //...use as normal
});

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