1、首先添加两个windows窗体项目，一个作为服务端server，一个作为客户端Client
2、然后添加服务端代码，添加命名空间，界面上添加TextBox控件
using System.Net;
using System.Net.Sockets;
3、FormLoad方法添加代码
private void Form1_Load(object sender, EventArgs e)
{
IPEndPoint epServer = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 7878);//IP地址和端口号
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//定义socket
socket.Bind(epServer);//绑定
socket.Listen(10);//监听
socket.BeginAccept(new AsyncCallback(RecVing), socket);//异步接收，回调方法为RecVing
}
4、添加回调方法代码
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，
定义委托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、到此为止，服务端已经添加完毕
7，客户端代码，首先跟服务端一样，添加命名空间，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，端口号
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.BeginConnect(IPEndPoint, new AsyncCallback(Sending), socket);//回调方法Sending
}
8、添加回调方法，代码如下
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、到此为止，客户端代码已经完成，调试的时候先启动服务端，然后启动客户端
10、运行截图如下，点击按钮前，在文本框中输入shixudong
.net的socket异步通讯示例分享
原文：http://www.jb51.net/article/48289.htm
