更新主窗口控件的内容2：子线程工作时同时更新主线程内的控件内容

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 WindowsFormsApplication1
{
    public partial class MainForm : Form
    {
        MainFormHelper mh = new MainFormHelper();
        public MainForm()
        {
            InitializeComponent();

            mh.SetMsgInfoEvent += new MainFormHelper.SetMsgInfoHandler(mh_SetMsgInfoEvent);
        }

        void mh_SetMsgInfoEvent(string msg)
        {
            this.textBox1.Text = msg; 
            this.textBox1.Update();
        }

        /// <summary>
        /// 入口
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            mh.Begin();
        }
    }

    public class MainFormHelper
    {
        public delegate void SetMsgInfoHandler(string msg);
        public event SetMsgInfoHandler SetMsgInfoEvent;

        public void Begin()
        {
            if (SetMsgInfoEvent != null)
            {
                for (int i = 0; i < 10; i++)
                {
                    SetMsgInfoEvent(i.ToString());
                    System.Threading.Thread.Sleep(500);
                }
            }
        }
    }
}