.net Csharpt C# UDP 异步发送信息代码实例-优快云博客

本文介绍了一个使用UDP协议实现客户端与服务器之间的异步通信的示例，包括客户端接收和服务器响应信息的过程。

接受端:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
/*异步接受类，并异步响应*/
namespace HostBackupReciever
{
class UpdData 
    {
public UdpClient u = null;
public IPEndPoint p = null;
    }

public class Receive2
    {
private bool msgGet = false;

public void Receive() 
        {
            IPEndPoint p = new IPEndPoint(IPAddress.Any,11000);
            UdpClient u = new UdpClient(p);
            u.BeginReceive(new AsyncCallback(ReceiveCallback),u);
        }

public void ReceiveCallback(IAsyncResult result) 
        {
            UdpClient u = (UdpClient)result.AsyncState;
            IPEndPoint p = new IPEndPoint(IPAddress.Any, 11000);
            Console.WriteLine("正在接收中.....");
            Thread.Sleep(6000);
byte[] recvData = u.EndReceive(result, ref p);
string rData = Encoding.Default.GetString(recvData);
            Console.WriteLine(rData);
            msgGet = true;
if (msgGet) 
            {
string respMsg = "这是服务器响应信息";
byte[] respDate = Encoding.Default.GetBytes(respMsg);

                u.BeginSend(respDate, respDate.Length, p,new AsyncCallback(SendCallback), u);            
            }
            u.BeginReceive(new AsyncCallback(ReceiveCallback), u);

        }

public void SendCallback(IAsyncResult result)
        {
            UdpClient u = (UdpClient)result.AsyncState;
            Console.WriteLine("已经发送的字节数位：" + u.EndSend(result));
        }

public static void Main(string[] args) 
        {
            Receive2 r2 = new Receive2();
            r2.Receive();
            Console.ReadKey();
        }
    }


}

发送端:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace SocketPros
{
class Sender2
    {
public void Send(string server,string msg) 
        {
            UdpClient u = new UdpClient(12000);
            IPEndPoint p = new IPEndPoint(IPAddress.Parse(server), 11000);

byte[] sendData = Encoding.Default.GetBytes(msg);
            u.BeginSend(sendData, sendData.Length,p, new AsyncCallback(SendCallback), u);

byte[] sendData2 = Encoding.Default.GetBytes("第二次发送");
            u.BeginSend(sendData2, sendData2.Length, p, new AsyncCallback(SendCallback), u);

            u.BeginReceive(new AsyncCallback(ReceiveCallback), u);
        }

public void ReceiveCallback(IAsyncResult result)
        {
            UdpClient u = (UdpClient)result.AsyncState;
            IPEndPoint p = new IPEndPoint(IPAddress.Any, 11000);
            Console.WriteLine("正在接收服务器响应信息中.....");
            Thread.Sleep(2000);
byte[] recvData = u.EndReceive(result, ref p);
string rData = Encoding.Default.GetString(recvData);
            Console.WriteLine("sender接收到的服务器的respMsg" + rData);

            u.BeginReceive(new AsyncCallback(ReceiveCallback), u);

        }

public void SendCallback(IAsyncResult result) 
        {

            UdpClient u = (UdpClient)result.AsyncState;
            Console.WriteLine("已经发送的字节数位：" + u.EndSend(result));
//msgSent = true;
        }

public static void Main(string[] args) 
        {
            Sender2 s2 = new Sender2();
            s2.Send("127.0.0.1","what a fucking code!!!!");
            Console.ReadKey();
        }
    }
}