自动升级程序

主程序如何检查是否有最新版本，我就不写了。

当检查到有新版本，就关闭主程序，运行这个新程序。这是我自己现在用的升级程序，分享下，有什么不好的地方大家提出来，我们一起进步。

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.IO;
using System.Net;
using System.Data.SqlClient;
using System.Configuration;

namespace updateWinform
{
    publicpartialclass Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        privatevoid Form1_Load(object sender, EventArgs e)
        {
        }
    
    //开始下载的按钮
privatevoid btnOK_Click(object sender, EventArgs e)
        {
            DownLoadFile();
            this.btnOK.Enabled =false;
        }

        privatevoid DownLoadFile()
        {
            //获取本次更新所需要下载的文件
            Dictionary<string, string> dic = GetLoadFile();
            dic.ToList().ForEach(p =>
            {
                ListViewItem item =new ListViewItem();
                item.Text = p.Key;//文件名
                item.SubItems.Add(p.Value);//大小
                listView1.Items.Add(item);
            });

            try
            {
                WebClient client =new WebClient();

                if (!Directory.Exists(Application.StartupPath +@"\update"))
                {
                    Directory.CreateDirectory(Application.StartupPath +@"\update");
                }
                for (int i =0; i <=this.listView1.Items.Count -1; i++)
                {
                    string hosturl = ConfigurationManager.AppSettings["url"].ToString();

                    string fileName =this.listView1.Items[i].SubItems[0].Text;
                    string url = hosturl + fileName;
                    string file = Application.StartupPath +"\\update\\"+ fileName;
                    this.label2.Visible =true;
                    this.label2.Text ="正在下载："+ fileName;

                    Stream myStream = client.OpenRead(url);
                    byte[] bBuffer =newbyte[10240];
                    int nRealCount =0;
                    DateTime dtStart = DateTime.Now;
                    TimeSpan ts;
                    int lenth = Convert.ToInt32(this.listView1.Items[i].SubItems[1].Text.ToString());
                    int cur =0;
                    progressBar1.Value =0;
                    FileStream fs =new FileStream(file, FileMode.OpenOrCreate, FileAccess.Write);

                    int value =0;
                    int counter =1;
                    do
                    {
                        if (counter %10==0)
                        {
                            ts = DateTime.Now - dtStart;

                            int perSecondsValue = (int)((double)value / (ts.TotalMilliseconds /1000)) /1024;

                            //this.label3.Text = "速度：" + perSecondsValue + "   k/s";
                            dtStart = DateTime.Now;
                            value =0;
                        }

                        nRealCount = myStream.Read(bBuffer, 0, bBuffer.Length);
                        if (nRealCount >0)
                        {
                            fs.Write(bBuffer, 0, nRealCount);
                        }
                        cur = cur + nRealCount;
                        double pe = cur;
                        pe = pe *100/ lenth;
                        int va = Convert.ToInt32(pe);
                        progressBar1.Value = va;

                        this.label2.Text ="正在下载："+ fileName +""+ cur /1024+"   KB/"+ lenth /1024+"

KB";

                        value += nRealCount;
                        counter++;
                    }
                    while (nRealCount >0);
                    fs.Close();
                    this.listView1.Items[i].SubItems.Add("已下载");
                }
                this.label2.Text ="正在更新文件,请稍后...";
                string[] fileDir = Directory.GetFileSystemEntries(Application.StartupPath +@"\update");

                foreach (string str in fileDir)
                {
                    int pos = str.LastIndexOf(@"\");
                    string FileName = str.Substring(pos);
                    string FilePath = Application.StartupPath + FileName;
                    File.Copy(str, FilePath, true);
                }
                this.label2.Text ="正在删除临时文件,请稍后...";
                System.IO.Directory.Delete(Application.StartupPath +@"\update", true);
                this.label2.Text ="程序更新已完成!";
                this.btnExit.Text ="完成(&F)";
            }
            catch (Exception errMsg)
            {
                MessageBox.Show(errMsg.Message);
            }
        }

        privatevoid btnExit_Click(object sender, EventArgs e)
        {
            if (btnExit.Text.Trim().Equals("取消"))
            {
                Application.Exit();
            }
            else
            {
                System.Diagnostics.Process.Start(Application.StartupPath +"\\"+"主程序.exe");
                Application.Exit();
            }
        }

    //从数据库读取所需要下载的文件
public Dictionary<string, string> GetLoadFile()
        {
            Dictionary<string, string> dic =new Dictionary<string, string>();
            string sql ="select top 1 LoadFile from 表 order by id desc";
            SqlDataReader read = DBHelper.GetReader(sql);
            string b ="";
            while (read.Read())
            {
                b = (string)read["LoadFile"];
            }
            read.Close();
            read.Dispose();

            string[] load = b.Split(';');
            load.ToList().ForEach(p =>
            {
                string[] detail = p.Split(',');
        //ditail[0]：下载的文件名 detail[1]:下载文件的大小,以便于计算进度条
                dic.Add(detail[0], detail[1]);
            });
            return dic;
        }
    }
}