https://www.cnblogs.com/dathlin/p/12303098.html

在Visual Studio 中的NuGet管理器中可以下载安装，也可以直接在NuGet控制台输入下面的指令安装：

Install-Package HslCommunication

#服务端

private WebSocketServer wsServer;

        private void button1_Click( object sender, EventArgs e )
        {
            try
            {
                wsServer = new WebSocketServer( );
                wsServer.OnClientApplicationMessageReceive +=  WebSocket_OnClientApplicationMessageReceive;
                wsServer.ServerStart( 1883 );
                MessageBox.Show( "Start Success" );
            }
            catch (Exception ex)
            {
                MessageBox.Show( "Start Failed : " + ex.Message );
            }
        }
        private void WebSocket_OnClientApplicationMessageReceive( WebSocketSession session, WebSocketMessage message )
        {
            Invoke( new Action( ( ) =>
            {
                if(!isStop)
                    textBox8.AppendText( $"OpCode:[{message.OpCode}] Mask:[{message.HasMask}] Payload:[{Encoding.UTF8.GetString( message.Payload )}]" + Environment.NewLine );
            } ) );
            }
        }

#客服端

<script type="text/javascript">

         function WebSocketTest()

         {

            if ("WebSocket" in window)

            {

               // 打开一个 web socket

               var ws = new WebSocket("ws://127.0.0.1:1883");

               ws.onopen = function()

               {

                  console.log("已经打开...");

               };

               ws.onmessage = function (evt)

               {

                  var received_msg = evt.data;

                  console.log(received_msg);

               };

            }

             

            else

            {

                console.log("您的浏览器不支持 WebSocket!");

            }

         }

      </script>