线程关不了

Question

我写个UDP的聊天程序，都可以运行，但是关闭后，进程还在，不知道如何才能在，任务管理器中把进程关掉啊， th.Abort();运行，但好象不好使。请大家帮帮忙，问题解决马上给分。using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;namespace point_talk_to_face
{
    public partial class Form1 : Form
    {
      
        public Form1()
        {
            InitializeComponent();
        }
        private Thread th;
        private void textBox2_TextChanged(object sender, EventArgs e)
        {        }        private void Form1_Load(object sender, EventArgs e)
        {
        //  new Thread(this.Listen).Start() ;
           System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false; 
           th = new Thread(new ThreadStart(Listen));
           th.Start();
        }        private void button1_Click(object sender, EventArgs e)
        {
                UdpClient udpclient1 = new UdpClient(textBox3.Text,9999);
                Byte[] data = Encoding.ASCII.GetBytes(textBox2.Text);
                udpclient1.Send(data, data.Length);
                textBox1.AppendText("我对"+textBox3.Text+"说："+textBox2.Text+"\n");
                udpclient1.Close();
        }
        private void Listen()
        {
            UdpClient udp = new UdpClient(9999);
            IPEndPoint remoteiep = new IPEndPoint(IPAddress.Any, 9999);            while (true)
            {
                try
                {
                    Byte[] data = udp.Receive(ref remoteiep);                    if (data.Length > 0)
                    {
                        string word = Encoding.ASCII.GetString(data);
                        label1.Text = remoteiep.Address.ToString();
                        label2.Text = remoteiep.Port.ToString();
                        textBox1.AppendText(label1.Text + "对我说：" + word.ToString() + "\n");
                    }
                    else
                    {
                        
                    }
                }
                catch (Exception ex)
                {
                    textBox1.AppendText(ex.Message);
                }
                udp.Close();
            }
        }        private void textBox1_TextChanged(object sender, EventArgs e)
        {        }        private void close(object sender, FormClosingEventArgs e)
        {
            
        }        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
        /*    l = false;
            th.Abort();
            Application.Exit();*/
          
            Application.Exit();
            th.Abort();
                   }
    }
}

Answer 1

最好不要放在 FormClosed里面
而放在 FormClosing里面代码这样写
try
{
    if(th!=null)
th.Abort()
}
catch{}

Answer 2

原因:
线程中
Byte[] data = udp.Receive(ref remoteiep); 
处于等待状态，也就是所谓的阻塞，必须让其结束才能真正结束线程方法:
 private void Listen() 
        { 
            UdpClient udp = new UdpClient(9999); 
把这个局部变量UdpClient udp 变成全局变量，
然后在关闭的时候把它udp.close
以上。

Answer 3

你加个flag吧
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;namespace point_talk_to_face
{
    public partial class Form1 : Form
    private bool recieve = false;
     
        public Form1()
        {
            InitializeComponent();
        }
        private Thread th;
        private void textBox2_TextChanged(object sender, EventArgs e)
        {        }        private void Form1_Load(object sender, EventArgs e)
        {
        //  new Thread(this.Listen).Start() ;
          System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
          th = new Thread(new ThreadStart(Listen));
recieve = true;
          th.Start();
        }        private void button1_Click(object sender, EventArgs e)
        {
                UdpClient udpclient1 = new UdpClient(textBox3.Text,9999);
                Byte[] data = Encoding.ASCII.GetBytes(textBox2.Text);
                udpclient1.Send(data, data.Length);
                textBox1.AppendText("我对"+textBox3.Text+"说："+textBox2.Text+"\n");
                udpclient1.Close();
        }
        private void Listen()
        {
            UdpClient udp = new UdpClient(9999);
            IPEndPoint remoteiep = new IPEndPoint(IPAddress.Any, 9999);            while (recieve)
            {
                try
                {
                    Byte[] data = udp.Receive(ref remoteiep);                    if (data.Length > 0)
                    {
                        string word = Encoding.ASCII.GetString(data);
                        label1.Text = remoteiep.Address.ToString();
                        label2.Text = remoteiep.Port.ToString();
                        textBox1.AppendText(label1.Text + "对我说：" + word.ToString() + "\n");
                    }
                    else
                    {
                       
                    }
                }
                catch (Exception ex)
                {
                    textBox1.AppendText(ex.Message);
                }
                udp.Close();
            }
        }        private void textBox1_TextChanged(object sender, EventArgs e)
        {        }        private void close(object sender, FormClosingEventArgs e)
        {
           
        }        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
        /*    l = false;
            th.Abort();
            Application.Exit();*/
         recieve = false;
            Application.Exit();
            th.Abort();
                  }
    }
} 
这样就能终止了。

Answer 4

UdpClient  ，启动线程定义成公共的
在窗体Closing事件   UdpClient  启动线程 关闭