C# udp聊天程序

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;

namespace UdpChatExample
{
    public partial class Form1 : Form
    {
        UdpClient udpClient = new UdpClient(11000);
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {

                // Sends a message to the host to which you have connected.
                Byte[] sendBytes = Encoding.ASCII.GetBytes("Is anybody there?");
                // Sends a message to a different host using optional hostname and port parameters.
                UdpClient udpClientB = new UdpClient();
                udpClientB.Send(sendBytes, sendBytes.Length, "127.0.0.1", 11000);

                //IPEndPoint object will allow us to read datagrams sent from any source.
                IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);

                // Blocks until a message returns on this socket from a remote host.
                Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
                string returnData = Encoding.ASCII.GetString(receiveBytes);

                // Uses the IPEndPoint object to determine which of these two hosts responded.
                Console.WriteLine("This is the message you received "  
                                             returnData.ToString());
                Console.WriteLine("This message was sent from "  
                                            RemoteIpEndPoint.Address.ToString()  
                                            " on their port number "  
                                            RemoteIpEndPoint.Port.ToString());

                udpClient.Close();
                udpClientB.Close();

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }
        
   


    }
}