.net Csharpt C# UDP 异步发送信息 代码实例

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();
        }
    }
}

代码仅供参考