c#网络编程UDP例子

using System; 
using System.Net; 
using System.Net.Sockets; 
using System.Text; 
using System.Threading; 
using System.Windows.Forms; 

 namespace UDPClient 
{ 
    public partial class frmUdp : Form 
    { 
        private UdpClient sendUdpClient; 
        private UdpClient receiveUpdClient; 
        public frmUdp() 
        { 
            InitializeComponent(); 
            IPAddress[] ips = Dns.GetHostAddresses(""); 
            tbxlocalip.Text = ips[2].ToString(); 
            int port = 51883; 
            tbxlocalPort.Text = port.ToString(); 
            tbxSendtoIp.Text = ips[2].ToString(); 
            tbxSendtoport.Text = port.ToString(); 
        } 
 
        // 接受消息 
        private void btnReceive_Click(object sender, EventArgs e) 
        { 
            // 创建接收套接字 
            IPAddress localIp = IPAddress.Parse(tbxlocalip.Text); 
            IPEndPoint localIpEndPoint = new IPEndPoint(localIp, int.Parse(tbxlocalPort.Text)); 
            receiveUpdClient = new UdpClient(localIpEndPoint); 
 
 
            Thread receiveThread = new Thread(ReceiveMessage); 
            receiveThread.Start(); 
        } 
 
        // 接收消息方法 
        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 = receiveUpdClient.Receive(ref remoteIpEndPoint); 
 
                    string message = Encoding.Unicode.GetString(receiveBytes); 
 
                    // 显示消息内容 
                    ShowMessageforView(lstbxMessageView, string.Format("{0}[{1}]", remoteIpEndPoint, message)); 
                } 
                catch 
                { 
                    break; 
                } 
            } 
        } 
 
        // 利用委托回调机制实现界面上消息内容显示 
        delegate void ShowMessageforViewCallBack(ListBox listbox, string text); 
        private void ShowMessageforView(ListBox listbox, string text) 
        { 
            if (listbox.InvokeRequired) 
            { 
                ShowMessageforViewCallBack showMessageforViewCallback = ShowMessageforView; 
                listbox.Invoke(showMessageforViewCallback, new object[] { listbox, text }); 
            } 
            else 
            { 
                lstbxMessageView.Items.Add(text); 
                lstbxMessageView.SelectedIndex = lstbxMessageView.Items.Count - 1; 
                lstbxMessageView.ClearSelected(); 
            } 
        } 
        private void btnSend_Click(object sender, EventArgs e) 
        { 
            if (tbxMessageSend.Text == string.Empty) 
            { 
                MessageBox.Show("发送内容不能为空","提示"); 
                return; 
            } 
 
            // 选择发送模式 
            if (chkbxAnonymous.Checked == true) 
            { 
                // 匿名模式(套接字绑定的端口由系统随机分配) 
                sendUdpClient = new UdpClient(0); 
            } 
            else 
            { 
                // 实名模式(套接字绑定到本地指定的端口) 
                IPAddress localIp = IPAddress.Parse(tbxlocalip.Text); 
                IPEndPoint localIpEndPoint = new IPEndPoint(localIp, int.Parse(tbxlocalPort.Text)); 
                sendUdpClient = new UdpClient(localIpEndPoint); 
            } 
 
            Thread sendThread = new Thread(SendMessage); 
            sendThread.Start(tbxMessageSend.Text); 
        } 
 
        // 发送消息方法 
        private void SendMessage(object obj) 
        { 
            string message = (string)obj; 
            byte[] sendbytes = Encoding.Unicode.GetBytes(message); 
            IPAddress remoteIp = IPAddress.Parse(tbxSendtoIp.Text); 
            IPEndPoint remoteIpEndPoint = new IPEndPoint(remoteIp, int.Parse(tbxSendtoport.Text)); 
            sendUdpClient.Send(sendbytes, sendbytes.Length, remoteIpEndPoint); 
           
            sendUdpClient.Close(); 
            
            // 清空发送消息框 
            ResetMessageText(tbxMessageSend); 
        } 
 
        // 采用了回调机制 
        // 使用委托实现跨线程界面的操作方式 
        delegate void ResetMessageCallback(TextBox textbox); 
        private void ResetMessageText(TextBox textbox) 
        { 
            // Control.InvokeRequired属性代表 
            // 如果空间的处理与调用线程在不同线程上创建的，则为true,否则为false 
            if (textbox.InvokeRequired) 
            { 
                ResetMessageCallback resetMessagecallback = ResetMessageText; 
                textbox.Invoke(resetMessagecallback, new object[] { textbox }); 
            } 
            else 
            { 
                textbox.Clear(); 
                textbox.Focus(); 
            } 
        } 
 
        // 停止接收 
        private void btnStop_Click(object sender, EventArgs e) 
        { 
            receiveUpdClient.Close(); 
        } 
 
        // 清空接受消息框 
        private void btnClear_Click(object sender, EventArgs e) 
        { 
            this.lstbxMessageView.Items.Clear(); 
        } 
    } 
}追问

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