你应该知道的.net平台下socket异步通讯（代码实例）

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

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
}

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);
}

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;
}
}
}

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
}

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!");
}
}