1            var socket = ar.AsyncState as Socket;
 2 
 3             //这就是客户端的Socket实例，我们后续可以将其保存起来
 4             var client = socket.EndAccept(ar);
 5 
 6             //判断是否是 webScoket
 7             client.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, null, null);
 8             string msg = Encoding.UTF8.GetString(buffer);
 9             if (!msg.Contains("Sec-WebSocket-Key"))
10                 return;
11 
12             client.Send(PackageHandShakeData(buffer, buffer.Length));
13 
14          var timer = new System.Timers.Timer();
15             timer.Interval = 2000D;
16             timer.Enabled = true;
17             timer.Elapsed += (o, a) =>
18             {
19                 //检测客户端Socket的状态
20                 if (client.Connected)
21                 {
22                     try
23                     {
24                         if (client.Poll(10, System.Net.Sockets.SelectMode.SelectWrite))
25                         {
26                             var data = Encoding.Unicode.GetBytes("Message from server at " + DateTime.Now.ToString());
27                             //var data = PackageHandShakeData(buffer, buffer.Length);
28                             client.Send(data, data.Length, SocketFlags.None);
29                         }
30                     }
31                     catch (SocketException ex)
32                     {
33                         Console.WriteLine(ex.Message);
34                     }
35                 }
36                 else
37                 {
38                     timer.Stop();
39                     timer.Enabled = false;
40                     Console.WriteLine("Client is disconnected, the timer is stop.");
41                 }
42             };
43             timer.Start();
44 
45 
46 socket.BeginAccept(new AsyncCallback(ClientMsg), socket);