C#一個簡單下載程式執行個體（可用於更新）

運行時的介面

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;namespace WindowsFormsApplication2{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }                private void button1_Click(object sender, EventArgs e)        {            System.Net.WebClient wc=new System.Net.WebClient ();           //非同步下載。。將下載的程式儲存在程式bin檔案裡            wc.DownloadFileAsync(new Uri("http://dl_dir.qq.com/qqfile/qq/QQ2010/QQ2010SP3.1.exe"),"QQ2010SP3.1.exe");            wc.DownloadProgressChanged += new System.Net.DownloadProgressChangedEventHandler(wc_DownloadProgressChanged);            wc.DownloadFileCompleted += new AsyncCompletedEventHandler(wc_DownloadFileCompleted);        }        void wc_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)        {            //throw new NotImplementedException();            if (MessageBox.Show("您已經下載成功,是否開啟應用程式？", "提示", MessageBoxButtons.YesNo) == DialogResult.Yes)            {                System.Diagnostics.Process.Start("QQ2010SP3.1.exe");//啟動剛下載的程式                this.Close();            }            else            {                this.Close(); ;            }        }        void wc_DownloadProgressChanged(object sender, System.Net.DownloadProgressChangedEventArgs e)        {            //throw new NotImplementedException();            progressBar1.Value = e.ProgressPercentage;//將progressbar的值設為下載的百分比        }    }}這是一個簡單的下載程式例子,沒寫羅貨通用的方法了..可以用於檢查更新..有興趣的可以做下..