初学UDP，点击发送没有反应

Question

using System;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace UDP
{
public partial class Form1 : Form
{
private IPEndPoint ipLocalPoint;
private EndPoint RemotePoint;
private Socket mySocket;
private bool RunningFlag = false;

public Form1()
{
    InitializeComponent();

    int port;
    IPAddress ip;
    //得到本机IP，设置UDP端口号     
    ip = getValidIP(tbLocalIP.Text);
    port = getValidPort(tbLocalPort.Text);
    ipLocalPoint = new IPEndPoint(ip, port);

    //定义网络类型，数据连接类型和网络协议UDP  
    mySocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

    //绑定网络地址  
    mySocket.Bind(ipLocalPoint);

    //得到客户机IP  
    ip = getValidIP(tbRemoteIP.Text);
    port = getValidPort(tbRemotePort.Text);
    IPEndPoint ipep = new IPEndPoint(ip, port);
    RemotePoint = (EndPoint)(ipep);

    //启动一个新的线程，执行方法this.ReceiveHandle，  
    //以便在一个独立的进程中执行数据接收的操作  

    RunningFlag = true;
    Thread thread = new Thread(new ThreadStart(this.ReceiveHandle));
    thread.Start();
}

//private string getIPAddress()
//{
//     //获得本机局域网IP地址  
//    IPAddress[] AddressList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;
//    if (AddressList.Length < 1)
//    {
//        return "";
//    }
//    return AddressList[0].ToString();
//}

private int getValidPort(string port)
{
    int lport;
    //测试端口号是否有效  
    try
    {
        //是否为空  
        if (port == "")
        {
            throw new ArgumentException("端口号无效，不能启动DUP");
        }
        lport = System.Convert.ToInt32(port);
    }
    catch (Exception e)
    {
        //ArgumentException,   
        //FormatException,   
        //OverflowException  
        Console.WriteLine("无效的端口号：" + e.ToString());
        this.tbMsg.AppendText("无效的端口号：" + e.ToString() + "\n");
        return -1;
    }
    return lport;
}


private IPAddress getValidIP(string ip)
{
    IPAddress lip = null;
    //测试IP是否有效  
    try
    {
        //是否为空  
        if (!IPAddress.TryParse(ip, out lip))
        {
            throw new ArgumentException(
                "IP无效，不能启动DUP");
        }
    }
    catch (Exception e)
    {
        //ArgumentException,   
        //FormatException,   
        //OverflowException  
        Console.WriteLine("无效的IP：" + e.ToString());
        this.tbMsg.AppendText("无效的IP：" + e.ToString() + "\n");
        return null;
    }
    return lip;
}

//定义一个委托
//在 WinForm开发过程中经常会用到线程，有时候还往往需要在线程中访问线程外的控件;
//比如：设置textbox的Text属性等等。如果直接设置程序必定会报出：从不是创建控件的线程访问它，这个异常。
//通常我们可以采用两种方法来解决。一是通过设置control的属性。二是通过delegate,而通过delegate也有两种方式，一种是常用的方式，另一种就是匿名方式。下面加以说明.
public delegate void MyInvoke(string strRecv);
private void ReceiveHandle()
{
    //接收数据处理线程  
    string msg;
    byte[] data = new byte[1024];
    MyInvoke myI = new MyInvoke(UpdateMsgTextBox);
    while (RunningFlag)
    {

        if (mySocket == null || mySocket.Available < 1)
        {
            Thread.Sleep(200);
            continue;
        }
        //跨线程调用控件  
        //接收UDP数据报，引用参数RemotePoint获得源地址  
        int rlen = mySocket.ReceiveFrom(data, ref RemotePoint);
        msg = Encoding.Default.GetString(data, 0, rlen);
        tbMsg.BeginInvoke(myI, new object[] { RemotePoint.ToString() + " : " + msg });

    }
}

private void btSend_Click(object sender, EventArgs e)
{
    string msg = tbSendMsg.Text;
    //发送UDP数据包  
    byte[] data = Encoding.Default.GetBytes(msg);
    mySocket.SendTo(data, data.Length, SocketFlags.None, RemotePoint);
}

private void UpdateMsgTextBox(string msg)
{
    //接收数据显示  
    this.tbMsg.AppendText(msg + "\n");
}

}
}

Answer 1

private void btSend_Click(object sender, EventArgs e)
你窗体上有叫btSend的按钮么，你这个事件处理函数关联给这个按钮的click了么