C#利用广播实现群发功能

来源：互联网发布：淘宝十大平面男模特编辑：程序博客网时间：2024/06/05 00:55
C#利用广播实现群发功能
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;//添加的命名空间引用using System.Net;using System.Net.Sockets;using System.Threading;namespace BroadcastExample{    public partial class FormBroacast : Form    {        delegate void AppendStringCallback(string text);        AppendStringCallback appendStringCallback;        //使用的接收端口号        private int port = 8001;        private UdpClient udpClient;        public FormBroacast()        {            InitializeComponent();            appendStringCallback = new AppendStringCallback(AppendString);        }        private void FormBroacast_Load(object sender, EventArgs e)        {            Thread myThread = new Thread(ReceiveData);            //将线程设为后台运行            myThread.IsBackground = true;            myThread.Start();        }              /// <summary>        /// 在后台运行的接收线程        /// </summary>        private void ReceiveData()        {            //在本机指定的端口接收            udpClient = new UdpClient(port);            IPEndPoint remote = null;            //接收从远程主机发送过来的信息；            while (true)            {                try                {                    //关闭udpClient时此句会产生异常                    byte[] bytes = udpClient.Receive(ref remote);                    string str = Encoding.UTF8.GetString(bytes, 0, bytes.Length);                    AppendString(string.Format("来自{0}：{1}", remote, str));                }                catch                {                    //退出循环，结束线程                    break;                }            }        }        /// <summary>        /// 发送消息        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void buttonSend_Click(object sender, EventArgs e)        {            UdpClient myUdpClient = new UdpClient();            try            {                //让其自动提供子网中的IP广播地址                IPEndPoint iep = new IPEndPoint(IPAddress.Broadcast, 8001);                //将发送内容转换为字节数组                byte[] bytes =Encoding.UTF8.GetBytes(textBox1.Text);                //向子网发送信息                myUdpClient.Send(bytes, bytes.Length, iep);                textBox1.Clear();                textBox1.Focus();            }            catch (Exception err)            {                MessageBox.Show(err.Message, "发送失败");            }            finally            {                myUdpClient.Close();            }        }               private void FormBroacast_FormClosing(object sender, FormClosingEventArgs e)        {            udpClient.Close();        }        private void AppendString(string text)        {            if (richTextBox1.InvokeRequired == true)            {                this.Invoke(appendStringCallback, text);            }            else            {                richTextBox1.AppendText(text + "\r\n");            }        }    }}
界面设计：