c# Invoke和BeginInvoke 区别

     private void button1_Click(object sender, EventArgs e)     
     ...{
　　　　　 this.textBox1.Text = "1";

         this.Invoke(new EventHandler(delegate       ...{
            this.textBox1.Text += "2";
         }));

         this.textBox1.Text += "3";
      }

		

     private void button1_Click(object sender, EventArgs e)     
     ...{
　　　　　 this.textBox1.Text = "1";

         this.BeginInvoke(new EventHandler(delegate       ...{
            this.textBox1.Text += "2";
         }));

         this.textBox1.Text += "3";
      }

		

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 InvokeTest
...{
    delegate void MsgDelegate(String str);//声明一个代理

    public partial class Form1 : Form
    ...{
        Thread[] threads = new Thread[10];//如果不使用关键字new出对象来，则会报“未将对象引用设置到对象的实例。”的错误
        public Form1()
        ...{
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        ...{
            Thread.CurrentThread.Name = "主线程";

            for(int i=0;i<10;i++)
            ...{
                Thread ts = new Thread(new ThreadStart(threadProc));
                ts.Name = "线程组成员"+i.ToString()+"号";
                threads[i] = ts;

                ts.IsBackground = true;
                ts.Start();
            }
           
        }

        private void showMsg(String str)
        ...{
            Thread.Sleep(5000);//线程休眠5秒...
            MessageBox.Show(str+"是在"+Thread.CurrentThread.Name+"中执行的");//显示执行该代理函数的是哪个线程
        }

        private void button1_Click(object sender, EventArgs e)
        ...{
            MessageBox.Show("执行A1代码段");

            Thread T1 = new Thread(threadProc1);
            T1.Name = "线程一";
            T1.Start();

            MessageBox.Show("执行B1代码段");
        }

        private void button2_Click(object sender, EventArgs e)
        ...{
            MessageBox.Show("执行A2代码段");

            Thread T2 = new Thread(threadProc2);
            T2.Name = "线程二";
            T2.Start();

            MessageBox.Show("执行B2代码段");
        }

        /**//// <summary>
        /// 线程一的线程函数
        /// </summary>
        private void threadProc1()
        ...{
            Invoke(new MsgDelegate(showMsg), new object[] ...{ "通过Invoke调用showMsg" });//相当于this.Invoke,调用要消耗较长时间的代码后完了才开始执行下一条语句
            MessageBox.Show("Invoke函数后调用，因为Invoke是同步执行的，所以刚才我一直在等待showMsg执行完呢，唉...");
        }

        /**//// <summary>
        /// 线程二的线程函数
        /// </summary>
        private void threadProc2()
        ...{
            BeginInvoke(new MsgDelegate(showMsg), new object[] ...{ "通过BeginInvoke调用showMsg" });//相当于this.BeginInvoke()调用要消耗较长时间的代码后立刻执行下一条语句
            MessageBox.Show("BeginInvoke函数后调用,但由于BeginInvoke的异步执行，故还没等showMsg执行完我就被执行了！哈哈...");
        }
        private void threadProc()
        ...{
            MessageBox.Show(Thread.CurrentThread.Name+" 已经运行！");
        }
    }
}