在创建窗口句柄之前，不能在控件上调用 Invoke 或 BeginInvoke

/**************************************************
 * 多线程下更新控件属性(测试)
 * 2007-11-3 西沉
 * ***********************************************/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        delegate void SetTextCallback(string text);
        delegate void EndPro();

        public Form1()
        {
            InitializeComponent();
        }

        public void Set_Text(string t)
        {
            //第一种多线程处理方式，判断控件的InvokeRequired属性
            //看是否非创建线程的调用
            if (this.label1.InvokeRequired)
            {
                SetTextCallback bk = new SetTextCallback(this.Set_Text);
                if(!this.IsDisposed)
                 this.Invoke(bk, new object[] { t});
            }
            else
            {
                this.label1.Text = t;
            }
        }
        public void End_Pro()
        {
            this.bt1.Enabled = true;
        }

        public void ThreadPro()
        {
            for (int i = 0; i < 10; i++)
            {
                this.Set_Text(string.Format("记数：{0}",i));
                Thread.Sleep(1000);
            }

            //第二种多线程处理方式，使用代理
            EndPro e = new EndPro(this.End_Pro);
            if (!this.IsDisposed)//注意：要判断窗体是否已销毁，否则会出现，异常提示：“在创建窗口句柄之前，不能在控件上调用 Invoke 或 BeginInvoke”
            {
                this.Invoke(e, new object[] { });
            }
        }

        private void bt1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(new ThreadStart(this.ThreadPro));
            t.Start();

            Button bt = sender as Button;
            bt.Enabled = false;
        }
    }
}