c#中子线程控制进度条的一个简单例子

 

    using System;
    using System.ComponentModel;
    using System.Windows.Forms;
    namespace WindowsApplication4
    {
        /**//// <summary>
        /// gui 类
        /// </summary>
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            private void button1_Click(object sender, EventArgs e)
            {
 //用子线程工作
                new System.Threading.Thread(new System.Threading.ThreadStart(StartDownload)).Start();
            }
            //开始下载
            public void StartDownload()
            {
                Downloader downloader = new Downloader();
                downloader.onDownLoadProgress += new Downloader.dDownloadProgress(downloader_onDownLoadProgress);
                downloader.Start();
            }
            //同步更新ui
            void downloader_onDownLoadProgress(long total, long current)
            {
                if (this.InvokeRequired)
                {
                    this.Invoke(new Downloader.dDownloadProgress(downloader_onDownLoadProgress), new object[] { total, current });
                }
                else
                {
                    this.progressBar1.Maximum = (int)total;
                    this.progressBar1.Value = (int)current;
                }
            }
        } 

        /**//// <summary>
        /// 下载类
        /// </summary>
        public class Downloader
        {
            //委托
            public delegate void dDownloadProgress(long total,long current);
            //事件
            public event dDownloadProgress onDownLoadProgress;
 //开始模拟工作
            public void Start()
            {
                for (int i = 0; i < 100; i++)
                {
                    if (onDownLoadProgress != null)
                        onDownLoadProgress(100, i);
                    System.Threading.Thread.Sleep(100);
                }
            }
         }
    }