C# 多线程，为什么abort了之后再start就出错

Question

VS 2008环境错误提示：线程正在运行或被终止；它无法重新启动。 搞不清楚……代码：
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.Threading;namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private Thread thread;
    
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
            thread = new Thread(new ThreadStart(fun));            Thread t = new Thread(new ThreadStart(a));
            t.Start();
        }        private void button1_Click(object sender, EventArgs e)
        {
            //thread = new Thread(new ThreadStart(fun));
            label1.Text = "0";
            thread.Start();
            button1.Enabled=false;
            button2.Enabled=true;
            button3.Enabled=false;
            button4.Enabled=true;
        }        private void button2_Click(object sender, EventArgs e)
        {
            thread.Suspend();
            button1.Enabled = false;
            button2.Enabled = false;
            button3.Enabled = true;
            button4.Enabled = false;        }        private void button3_Click(object sender, EventArgs e)
        {
            thread.Resume();
            button1.Enabled = false;
            button2.Enabled = true;
            button3.Enabled = false;
            button4.Enabled = true;        }        private void button4_Click(object sender, EventArgs e)
        {
            if (thread.IsAlive)
            {
                thread.Abort();//撤销线程对象
                button1.Enabled = true;
                button2.Enabled = false;
                button3.Enabled = false;
                button4.Enabled = false;
            }        }        public void fun()
        {
            while(true)//死循环，线程将一直运行
            {
                int x = Convert.ToInt16(label1.Text);
                x++;
                label1.Text=Convert.ToString(x);
                Thread.Sleep(1000);//休眠1秒钟，休眠一次，线程运行了1秒钟
            }        }
}
}

Answer 1

   private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
            thread = new Thread(new ThreadStart(fun));            Thread t = new Thread(new ThreadStart(a));
            t.Start();
        }
改成
   private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;            Thread t = new Thread(new ThreadStart(a));
            t.Start();
        }------------
thread = new Thread(new ThreadStart(fun));写到这里，就好了……
-----------
      private void button1_Click(object sender, EventArgs e)
        {
            thread = new Thread(new ThreadStart(fun));
            label1.Text = "0";
            thread.Start();
            button1.Enabled=false;
            button2.Enabled=true;
            button3.Enabled=false;
            button4.Enabled=true;
        }

Answer 2

恩，重新new就可以了。debug退出时，提示
protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }执行 CreateHandle() 时无法调用值 Dispose()。是下面这个原因么？
当您在 Visual Studio 调试器中运行代码时，如果从一个线程访问某个 UI 元素，而该线程不是创建该 UI 元素时所在的线程，则会引发 InvalidOperationException。调试器引发此异常以警告您存在危险的编程做法。UI 元素不是线程安全的，所以只应在创建它们的线程上进行访问。