.net的socket異步通訊示例分享

1、首先添加兩個windows窗體項目，一個作為服務端server，一個作為客戶端Client

2、然后添加服務端代碼，添加命名空間，界面上添加TextBox控件

代碼如下:
using System.Net;
using System.Net.Sockets;

3、FormLoad方法添加代碼

代碼如下:
private void Form1_Load(object sender, EventArgs e)
        {
            IPEndPoint epServer = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 7878);//IP地址和端口號
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//定義socket
            socket.Bind(epServer);//綁定
            socket.Listen(10);//監聽
            socket.BeginAccept(new AsyncCallback(RecVing), socket);//異步接收，回調方法為RecVing
        }

4、添加回調方法代碼

代碼如下:
private void RecVing(IAsyncResult rec_socket)
        {
            string cmdstr = "";
            Socket sc = (Socket)rec_socket.AsyncState;
            Socket socket = sc.EndAccept(rec_socket);
            byte[] bytes = new byte[1024];
            int i = socket.Receive(bytes);
            cmdstr = Encoding.UTF8.GetString(bytes, 0, i);
            showstrs(cmdstr);
            sc.BeginAccept(new AsyncCallback(RecVing), sc);
        }

5、添加showstrs方法，

定義委托private delegate void shixudong_invoke(string invokefun);

代碼如下:
private void showstrs(string recv_strs)
        {
            if (recv_strs.Length != 0)
            {
                if (this.InvokeRequired)
                {
                    shixudong_invoke invoke = new shixudong_invoke(showstrs);
                    this.Invoke(invoke, (object)recv_strs);
                }
                else
                {
                    textBox1.Text = recv_strs;

                }
            }

6、到此為止，服務端已經添加完畢

7，客戶端代碼，首先跟服務端一樣，添加命名空間，在界面上添加button事件

代碼如下:
private void button1_Click(object sender, EventArgs e)
        {
            IPEndPoint IPEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 7878);//IP，端口號
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.BeginConnect(IPEndPoint, new AsyncCallback(Sending), socket);//回調方法Sending
        }

8、添加回調方法，代碼如下

代碼如下:
private void Sending(IAsyncResult rec_socket)
        {
            Socket socket = (Socket)rec_socket.AsyncState;
            try
            {
                if (socket.Connected)
                {
                    byte[] msgBuff = Encoding.UTF8.GetBytes(textBox1.Text);
                    socket.Send(msgBuff);
                    //socket.Accept();
                }
                else
                {
                    Console.WriteLine("Error!", "Error!");
                }
            }
            catch
            {
                Console.WriteLine("Error!", "Error!");
            }

9、到此為止，客戶端代碼已經完成，調試的時候先啟動服務端，然后啟動客戶端

10、運行截圖如下，點擊按鈕前，在文本框中輸入shixudong

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