C#实现异步阻塞TCP（Send，Receive，Accept，Connect）

1.类

（1）服务器端操作类

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public class TcpServiceSocket {     //接收数据事件     public Action<Socket, string> recvMessageEvent = null;     //发送结果事件     public Action<int> sendResultEvent = null;     //允许连接到tcp服务器的tcp客户端数量     private int numConnections = 0;     //连接socket     private Socket listenSocket = null;     //tcp服务器ip     private string host = "";     //tcp服务器端口     private int port = 0;     //控制tcp客户端连接数量的信号量     private Semaphore maxNumberAcceptedClients = null;     private int bufferSize = 1024;     private List<Socket> clientSockets = null;       public TcpServiceSocket(string host, int port, int numConnections)     {         if (string.IsNullOrEmpty(host))             throw new ArgumentNullException("host cannot be null");         if (port < 1 || port > 65535)             throw new ArgumentOutOfRangeException("port is out of range");         if (numConnections <= 0 || numConnections > int.MaxValue)             throw new ArgumentOutOfRangeException("_numConnections is out of range");           this.host = host;         this.port = port;         this.numConnections = numConnections;         clientSockets = new List<Socket>();         maxNumberAcceptedClients = new Semaphore(numConnections, numConnections);     }       public void Start()     {         try         {             listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);             listenSocket.Bind(new IPEndPoint(IPAddress.Parse(host), port));             listenSocket.Listen(numConnections);             AcceptAsync();         }         catch (Exception)         {         }     }       private async void AcceptAsync()     {         await Task.Run(new Action(() =>         {             while (true)             {                 maxNumberAcceptedClients.WaitOne();                   try                 {                     Socket acceptSocket = listenSocket.Accept();                     if (acceptSocket == null)                         continue;                       clientSockets.Add(acceptSocket);                     RecvAsync(acceptSocket);                 }                 catch (Exception)                 {                     maxNumberAcceptedClients.Release();                 }             }         }));     }       private async void RecvAsync(Socket acceptSocket)     {         await Task.Run(new Action(() =>         {             int len = 0;             byte[] buffer = new byte[bufferSize];               try             {                 while ((len = acceptSocket.Receive(buffer, bufferSize, SocketFlags.None)) > 0)                 {                     if (recvMessageEvent != null)                         recvMessageEvent(acceptSocket, Encoding.UTF8.GetString(buffer, 0, len));                 }             }             catch (Exception)             {                 CloseClientSocket(acceptSocket);             }         }));     }       public async void SendAsync(Socket acceptSocket, string message)     {         await Task.Run(new Action(() =>         {             int len = 0;             byte[] buffer = Encoding.UTF8.GetBytes(message);             try             {                 if ((len = acceptSocket.Send(buffer, buffer.Length, SocketFlags.None)) > 0)                 {                     if (sendResultEvent != null)                         sendResultEvent(len);                 }             }             catch (Exception)             {                 CloseClientSocket(acceptSocket);             }         }));     }       public async void SendMessageToAllClientsAsync(string message)     {         await Task.Run(new Action(() =>         {             foreach (var socket in clientSockets)             {                 SendAsync(socket, message);             }         }));     }       private void CloseClientSocket(Socket acceptSocket)     {         try         {             acceptSocket.Shutdown(SocketShutdown.Both);         }         catch { }         try         {             acceptSocket.Close();         }         catch { }           maxNumberAcceptedClients.Release();     }       public void CloseAllClientSocket(Socket acceptSocket)     {         try         {             foreach (var socket in clientSockets)             {                 socket.Shutdown(SocketShutdown.Both);             }         }         catch { }         try         {             foreach (var socket in clientSockets)             {                 socket.Close();             }         }         catch { }           try         {             listenSocket.Shutdown(SocketShutdown.Both);         }         catch { }         try         {             listenSocket.Close();         }         catch { }           try         {             maxNumberAcceptedClients.Release(clientSockets.Count);             clientSockets.Clear();         }         catch { }     } }

　　

（2）客户端操作类

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public class TcpClientSocket {     //接收数据事件     public Action<string> recvMessageEvent = null;     //发送结果事件     public Action<int> sendResultEvent = null;     //连接socket     private Socket connectSocket = null;     //tcp服务器ip     private string host = "";     //tcp服务器端口     private int port = 0;     private int bufferSize = 1024;       public TcpClientSocket(string host, int port)     {         if (string.IsNullOrEmpty(host))             throw new ArgumentNullException("host cannot be null");         if (port < 1 || port > 65535)             throw new ArgumentOutOfRangeException("port is out of range");           this.host = host;         this.port = port;     }       public void Start()     {         try         {             connectSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);             connectSocket.Connect(host, port);             RecvAsync();         }         catch (Exception)         {         }     }       private async void RecvAsync()     {         await Task.Run(new Action(() =>         {             int len = 0;             byte[] buffer = new byte[bufferSize];             try             {                 while ((len = connectSocket.Receive(buffer, bufferSize, SocketFlags.None)) > 0)                 {                     if (recvMessageEvent != null)                         recvMessageEvent(Encoding.UTF8.GetString(buffer, 0, len));                 }             }             catch (Exception)             {                 Restart();             }         }));     }       public async void SendAsync(string message)     {         await Task.Run(new Action(() =>         {             int len = 0;             byte[] buffer = Encoding.UTF8.GetBytes(message);             try             {                 if ((len = connectSocket.Send(buffer, buffer.Length, SocketFlags.None)) > 0)                 {                     if (sendResultEvent != null)                         sendResultEvent(len);                 }             }             catch (Exception)             {                 Restart();             }         }));     }       public void CloseClientSocket()     {         try         {             connectSocket.Shutdown(SocketShutdown.Both);         }         catch { }         try         {             connectSocket.Close();         }         catch { }     }       public void Restart()     {         CloseClientSocket();         Start();     }   }

　　

2.使用

（1）服务器：

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public partial class Form1 : Form {     TcpServiceSocket tcpServiceSocket = null;     private readonly string ip = "192.168.172.142";     private readonly int port = 8090;       public Form1()     {         InitializeComponent();         tcpServiceSocket = new TcpServiceSocket(ip, port, 10);         tcpServiceSocket.recvMessageEvent += new Action<Socket, string>(Recv);     }       private void Recv(Socket socket, string message)     {         this.BeginInvoke(new Action(() =>         {             tbRecv.Text += message + "\r\n";         }));     }       private void btnStart_Click(object sender, EventArgs e)     {         tcpServiceSocket.Start();     }       private void btnSend_Click(object sender, EventArgs e)     {         string message = tbSend.Text.Trim();         if (string.IsNullOrEmpty(message))             return;           tcpServiceSocket.SendMessageToAllClientsAsync(message);         tbSend.Text = "";     } }

　　

（2）客户端

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public partial class Form1 : Form {     private TcpClientSocket tcpClientSocket = null;     private readonly string ip = "192.168.172.142";     private readonly int port = 8090;       public Form1()     {         InitializeComponent();         tcpClientSocket = new TcpClientSocket(ip, port);         tcpClientSocket.recvMessageEvent += new Action<string>(Recv);     }       private void Recv(string message)     {         this.BeginInvoke(new Action(() =>         {             tbRecv.Text += message + "\r\n";         }));     }       private void btnStart_Click(object sender, EventArgs e)     {         tcpClientSocket.Start();     }       private void btnSend_Click(object sender, EventArgs e)     {         string message = tbSend.Text.Trim();         if (string.IsNullOrEmpty(message))             return;           tcpClientSocket.SendAsync(message);         tbSend.Text = "";     } }