Windows多线程

今天学习的线程，并用多线程实现了一个简单的下载网页的案例，如下：

前台设计入下：两个Button,一个TextBox和一个 backgroundworker控件

后台代码：

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.Net;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 30320; i < 30340; i++)
            {
                try
                {
                    WebClient client = new WebClient();
                    client.DownloadFile(@"http://job.cnblogs.com/offer/" + i + "/", @"E:\PPDownload\" + i + ".html");

                }
                catch (Exception ex)//异常吃掉
                { }
           
            }

            Action action = new Action(Msg);
            this.Invoke(action);

        }

        private void Msg()
        {
            MessageBox.Show("下载成功");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MessageBox.Show("精彩大片，应有尽有");
        }
    }
}

点击下载按钮程序运行时，点击资源库按钮是可以运行的，这就是开辟了另外一个线程的元婴；下载完成后需要点击弹出的会话框"下载完成"，再次点击资源库按钮可以运行，若不点击“下载完成”，资源库按钮不会被执行。