你應該知道的.net平臺下socket異步通信（代碼實例）

1，首先添加兩個windows窗體項目，一個做爲服務端server，一個做爲客戶端Client

2，而後添加服務端代碼，添加命名空間，界面上添加TextBox控件

using System.Net;
using System.Net.Sockets;

3，FormLoad方法添加代碼

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，回調方法爲RecVing
        }

4，添加回調方法代碼

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，

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

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，到此爲止，服務端已經添加完畢

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

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，代碼以下

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，到此爲止，客戶端代碼已經完成，調試的時候先啓動服務端，而後啓動客戶端

10，運行截圖以下，點擊按鈕前，在文本框中輸入shixudong

11，點擊按鈕以後截圖以下

測試成功，有問題的能夠聯繫我shixudong3@yeah.net,但願能多你們有所幫助！