.NET WinForm中 一个 跨线程访问控件的示例（网络）

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 DelegateSample
{
/// <summary>
/// 这里声明一个委托供线程调用
/// </summary>
/// <param name="txt"></param>
public delegate void AppendTextHandler(string txt);

public partial class Form1 : Form
{
Thread m_trd = null;
//实例化一个委托对象
AppendTextHandler m_handler = null;

public Form1()
{
InitializeComponent();
}

/// <summary>
/// 窗体Load 事件
/// </summary>
/// <param name="e"></param>
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
//实例化一个委托对象
m_handler = new AppendTextHandler(AppendTextText);

//开启新线程
m_trd = new Thread(new ThreadStart(OtherThreadDoSomething));
m_trd.Start();
}

/// <summary>
/// 关闭窗体时结束创建的线程
/// </summary>
/// <param name="e"></param>
protected override void OnClosed(EventArgs e)
{
base.OnClosed(e);
if (m_trd != null)
{
m_trd.Abort();
}
}

/// <summary>
/// 线程执行的方法
/// </summary>
private void OtherThreadDoSomething()
{
string _str;
while (Thread.CurrentThread.ThreadState!=ThreadState.Aborted)
{//线程未请求终止就一直执行
_str = System.Guid.NewGuid().ToString();
AppendTextText(_str);
Thread.Sleep(50);//可去掉
}
}

/// <summary>
/// 向当前窗体控件中增加文本
/// </summary>
/// <param name="txt"></param>
private void AppendTextText(string txt)
{
if (this.richTextBox1.InvokeRequired)
{//调用方在另外一个线程中
//在拥有此控件的线程上执行委托指向的方法
this.richTextBox1.Invoke(m_handler, txt);
}
else
{//调用方在当前线程中
this.richTextBox1.AppendText(txt + "\r\n");//增加文本
this.richTextBox1.ScrollToCaret();//滚动到当前目录
}
}
}
}