请高手帮忙解决VS.net2005多线程处理

Question

线程间直接操作是无效,可以用一个代理
主线程：
第一步：定义委托delegate
private delegate void setConn(string strConn);
private setConn mySetConn = null;
第二步：定义一个方法
private void DispText(string strConn)
{
    textBox1.Text = strConn;
}
第三步：初始化委托
mySetConn = new setConn(this.DispText);
第四步：在工作线程中
this.Invoke(mySetConn, "把我显示在textBox1中，谢谢！");

Answer 1

private delegate void dodelegate(System.Windows.Forms.ProgressBar pb);
        dodelegate mydo = null;
        private void doit(System.Windows.Forms.ProgressBar pb)
        {
            if (progressBar1.InvokeRequired)
            {
                pb.Minimum = 0;
                pb.Maximum = 100;
                pb.Step = 1;
                pb.Value = 0;
                for (int i = 0; i < 100; i++)
                {
                    pb.Value = pb.Value + 1;
                    System.Threading.Thread.Sleep(200);
                }
            }
        }
        private void button4_Click(object sender, EventArgs e)
        {
            mydo = new dodelegate(doit);
            mydo.BeginInvoke(progressBar1,null,null);
        }
progressbar1为一个窗体上的控件，但是在执行时，仍然报线程间操作无效: 从不是创建控件“progressBar1”的线程访问它，有高手能解答吗，谢谢！最好能贴出代码片断

Answer 2

线程中不能直接给控件赋值，需要调用控件的Invoke方法

Answer 3

先看看这篇文章，我回答部分
http://community.csdn.net/Expert/topic/5339/5339904.xml?temp=.8979608

Answer 4

public partial class Form1 : Form
    {
        private delegate void dodelegate(System.Windows.Forms.ProgressBar pb);
        public Form1()
        {
            InitializeComponent();
        }        private void button4_Click(object sender, EventArgs e)
        {
            dodelegate mydo = new dodelegate(doit);
            this.Invoke(mydo, new object[] { progressBar1 });
        }        private void doit(System.Windows.Forms.ProgressBar pb)
        {
            pb.Minimum = 0;
            pb.Maximum = 100;
            pb.Step = 1;
            pb.Value = 0;
            for (int i = 0; i < 100; i++)
            {
                pb.Value = pb.Value + 1;
                System.Threading.Thread.Sleep(200);
            }
        }
    }
不过这样写窗体会假死

Answer 5

用下面的方法就不会发生假死了
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
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button4_Click(object sender, EventArgs e)
        {
            Worker worker = new Worker();
            worker.ProcessEvent += new ProcessEventHandler(worker_ProcessEvent);
            worker.Start();
        }        private void worker_ProcessEvent(int count)
        {
            this.Invoke(new ProcessEventHandler(this.ShowProcess), new object[] { count });
        }        private void ShowProcess(int count)
        {
            progressBar1.Value = count;
        }
    }    public delegate void ProcessEventHandler(int count);
    public class Worker
    {
        public event ProcessEventHandler ProcessEvent = null;        public void Start()
        {
            Thread thread = new Thread(new ThreadStart(delegate()
            {
                for (int i = 0; i < 100; i++)
                {
                    if (ProcessEvent != null)
                    {
                        ProcessEvent(i);
                    }
                    Thread.Sleep(200);
                }            
            }));
            thread.IsBackground = true;
            thread.Start();
        }
    }
}