C#中如何进行UDP编程补充

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下面就直接介绍实现过程和代码以及运行的结果。

一、程序实现

UDP广播程序的实现代码：

using System;  using System.Net;  using System.Net.Sockets;  using System.Text;  using System.Threading;  using System.Windows.Forms;  namespace UDPBroadcast  {      ///       /// 在界面上，用户可以设置本地进程的IP地址和端口号，并将地址加入某个组播组；      /// 可以输入发送消息的目的组的地址，并且勾选“广播”复选框将采用广播的方式发送信息      /// 在界面上点击“接受按钮”就启动接收线程，这样程序就可以接收广播或组播的信息      /// 
      public partial class UdpBroadcasefrm : Form      {          private UdpClient sendUdpClient;          private UdpClient receiveUdpClient;          // 组播IP地址          IPEndPoint broadcastIpEndPoint;          public UdpBroadcasefrm()          {              InitializeComponent();              IPAddress[] ips = DNS.GetHostAddresses(Dns.GetHostName());              tbxlocalip.Text = ips[5].ToString();              tbxlocalport.Text = "8002";              // 默认组,组播地址是有范围              // 具体关于组播和广播的介绍参照我上一篇博客UDP编程              // 本地组播组              tbxGroupIp.Text = "224.0.0.1";              // 发送到的组播组              tbxSendToGroupIp.Text = "224.0.0.1";          }           // 设置加入组          private void chkbxJoinGtoup_Click(object sender, EventArgs e)          {              if (chkbxJoinGtoup.Checked == true)              {                  tbxGroupIp.Enabled = false;              }              else             {                  tbxGroupIp.Enabled = true;                  tbxGroupIp.Focus();              }          }           // 选择发送模式后设置          private void chkbxBroadcast_Click(object sender, EventArgs e)          {              if (chkbxBroadcast.Checked == true)              {                  tbxSendToGroupIp.Enabled = false;              }              else             {                  tbxSendToGroupIp.Enabled = true;                  tbxSendToGroupIp.Focus();              }          }           // 发送消息          private void btnSend_Click(object sender, EventArgs e)          {              if (tbxMessageSend.Text == "")              {                  MessageBox.Show("消息内容不能为空！","提示");                  return;              }               // 根据选择的模式发送信息              if (chkbxBroadcast.Checked == true)              {                  // 广播模式(自动获得子网中的IP广播地址)                  broadcastIpEndPoint = new IPEndPoint(IPAddress.Broadcast, 8002);              }              else             {                  // 组播模式                  broadcastIpEndPoint = new IPEndPoint(IPAddress.Parse(tbxSendToGroupIp.Text), 8002);              }               // 启动发送线程发送消息              Thread sendThread = new Thread(SendMessage);              sendThread.Start(tbxMessageSend.Text);          }           // 发送消息          private void SendMessage(object obj)          {              string message = obj.ToString();              byte[] messagebytes = Encoding.Unicode.GetBytes(message);              sendUdpClient = new UdpClient();              // 发送消息到组播或广播地址              sendUdpClient.Send(messagebytes, messagebytes.Length, broadcastIpEndPoint);              sendUdpClient.Close();                            // 清空编辑消息框              ResetMessageText(tbxMessageSend);          }           // 利用委托回调机制来实现界面上的消息清空操作          delegate void ResetMessageTextCallBack(TextBox textbox);          private void ResetMessageText(TextBox textbox)          {              if (textbox.InvokeRequired)              {                  ResetMessageTextCallBack resetMessageCallback = ResetMessageText;                  textbox.Invoke(resetMessageCallback, new object[] { textbox });              }              else             {                  textbox.Clear();                  textbox.Focus();              }          }           // 接收消息          private void btnReceive_Click(object sender, EventArgs e)          {              chkbxJoinGtoup.Enabled = false;              // 创建接收套接字              IPAddress localIp = IPAddress.Parse(tbxlocalip.Text);              IPEndPoint localIpEndPoint = new IPEndPoint(localIp, int.Parse(tbxlocalport.Text));              receiveUdpClient = new UdpClient(localIpEndPoint);              // 加入组播组              if (chkbxJoinGtoup.Checked == true)              {                  receiveUdpClient.JoinMulticastGroup(IPAddress.Parse(tbxGroupIp.Text));                  receiveUdpClient.Ttl = 50;              }              // 启动接受线程              Thread threadReceive = new Thread(ReceiveMessage);              threadReceive.Start();          }           // 接受消息方法          private void ReceiveMessage()          {              IPEndPoint remoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);              while (true)              {                  try                 {                      // 关闭receiveUdpClient时此时会产生异常                      byte[] receiveBytes = receiveUdpClient.Receive(ref remoteIpEndPoint);                      string receivemessage = Encoding.Unicode.GetString(receiveBytes);                       // 显示消息内容                      ShowMessage(lstMessageBox, string.Format("{0}[{1}]", remoteIpEndPoint, receivemessage));                  }                  catch                 {                      break;                  }              }          }          // 通过委托回调机制显示消息内容          delegate void ShowMessageCallBack(ListBox listbox,string text);          private void ShowMessage(ListBox listbox, string text)          {              if (listbox.InvokeRequired)              {                  ShowMessageCallBack showmessageCallback = ShowMessage;                  listbox.Invoke(showmessageCallback, new object[] { listbox, text });              }              else             {                  listbox.Items.Add(text);                  listbox.SelectedIndex = listbox.Items.Count - 1;                  listbox.ClearSelected();              }          }           // 清空消息列表          private void btnClear_Click(object sender, EventArgs e)          {              lstMessageBox.Items.Clear();          }           // 停止接收          private void btnStop_Click(object sender, EventArgs e)          {              chkbxJoinGtoup.Enabled =true;              receiveUdpClient.Close();          }        }  }

广播演示结果（接收端直接点接收按钮后开启接受线程，在发送端勾选“广播选项”输入发送信息点发送按钮后的界面如下）：

C#中如何进行UDP编程补充