1、判断是否更新：

拿数据库的该项目的最大版本号和AssemblyInfo中的版本号做比较判断是否需要更新：

数据库存放版本号表格式：命名空间就是我的系统ID

  private bool VersionUpdate()
        {
            string sql = "select Max(Version) from sys_Version where SystemID = '" + System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.Namespace + "' ";
//System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.Namespace是用来获取命名空间名称的
            DataTable dt;
            if (!DB.AF.execSql(sql, sqlconnks, out dt))
            {
                return false;
            }
            string newVersion = dt.Rows[0][0].ToString();
            Version ver = new Version(newVersion);
            Version verson = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            int tm = verson.CompareTo(ver); //版本号比较
            if (tm >= 0)
                return false;
            else
                return true;
        }

如果数据库的版本号比较大，就提示更新：这里是把CopyUpdate程序放在该解决方案的项目下面

在主程序的Load（）下面调用检测更新的函数，如果返回值为True，调用CopyUpdate的程序，结束该线程

     if (VersionUpdate())
            {
                MessageBox.Show("检测到新版本！","更新",MessageBoxButtons.OK,MessageBoxIcon.Information);
                string fileName = @"~\"+ System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.Namespace + @"\CopyUpdate\bin\Debug\CopyUpdate.exe";
                Process p = new Process();
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.FileName = fileName;
                p.StartInfo.CreateNoWindow = true;
                p.Start();
                System.Environment.Exit(System.Environment.ExitCode);
            }

接下来就是CopyUpdate的事情了，这块做成了通用的，放在任何一个程序下面都可以用：

思路是从服务器IIS上下载ZIP文件解压覆盖原程序：

这次改了通用版，就是路径不是写死的

先上一下ZIP的类的代码：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CopyUpdate
{
    public class ZipHelper
    {

        //public static string zipFileFullName = "Update.zip";
        public static void Unzip()
        {
            string str = System.Environment.CurrentDirectory;
            string path = str;
            for (int i = 0; i < 3; i++)
            {
                path = Path.GetDirectoryName(path);
            }
            string[] dirName = path.Split('\\');
            //MessageBox.Show("path:" + path);
            string _appPath = new DirectoryInfo(Assembly.GetExecutingAssembly().ManifestModule.FullyQualifiedName).Parent.FullName;
            string s7z = System.Environment.CurrentDirectory+ @"\7-Zip\7z.exe";
            //MessageBox.Show("s7z:" + s7z);
            //MessageBox.Show("1:"+ dirName[dirName.Length - 1] + ".zip");
            System.Diagnostics.Process pNew = new System.Diagnostics.Process();
            pNew.StartInfo.FileName = s7z;
            pNew.StartInfo.Arguments = string.Format(" x \"{0}\\{1}\" -y -o\"{0}\"",path, dirName[dirName.Length - 1] + ".zip");
          
            //x "1" -y -o"2" 这段7z命令的意思： x是解压的意思 "{0}"的位置写要解压文件路径"{1}"这个1的位置写要解压的文件名 -y是覆盖的意思 -o是要解压的位置
            pNew.Start();
            //等待完成
            pNew.WaitForExit();
            //MessageBox.Show("De:"+path + dirName[dirName.Length - 1] + ".zip");
            //删除压缩包         　 
            File.Delete([email protected]"\" + dirName[dirName.Length - 1] + ".zip");


        }
    }
}

然后是更新的主程序的代码：

更新界面：

 代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CopyUpdate
{
    public partial class CopyUpdate : Form
    {
        private string updateUrl = string.Empty;
        private string tempUpdatePath = string.Empty;
        public CopyUpdate()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Thread threadDown = new Thread(new ThreadStart(DownUpdateFile));
            threadDown.IsBackground = true;
            threadDown.Start();
        }
        private void DownUpdateFile()
        {
            string str = System.Environment.CurrentDirectory;
            //MessageBox.Show(str);
            string path = str;
            for (int i = 0; i < 3; i++)
            {
                path = Path.GetDirectoryName(path);
            }
            string[] dirName = path.Split('\\');
            //dirName[dirName.Length - 1]获取CopyUpdate程序的上级目录，一般按照待更新的目标程序命名
            WebClient wcClient = new WebClient();
            //线程安全问题  (以不安全的方式访问控件)
            CheckForIllegalCrossThreadCalls = false;
            string UpdateFile = dirName[dirName.Length - 1] + ".zip";
            tempUpdatePath = Environment.GetEnvironmentVariable("Temp") + "\\" + "_" + dirName[dirName.Length - 1] + "_" + "y" + "_" + "x" + "_" + "m" + "_" + "\\";
            //MessageBox.Show(UpdateFile);
            string updateFileUrl = "http://172.17.9.19:8080/" + UpdateFile;
            long fileLength = 0;
            //MessageBox.Show(updateFileUrl);
            WebRequest webReq = WebRequest.Create(updateFileUrl);
            WebResponse webRes = webReq.GetResponse();
            //MessageBox.Show(webRes.ContentLength.ToString());
            fileLength = webRes.ContentLength;
            //MessageBox.Show(fileLength.ToString());
            lbState.Text = "正在下载更新文件,请稍后...";
            pbDownFile.Value = 0;
            pbDownFile.Maximum = (int)fileLength;
            try
            {
                Stream srm = webRes.GetResponseStream();
                StreamReader srmReader = new StreamReader(srm);
                byte[] bufferbyte = new byte[fileLength];
                int allByte = (int)bufferbyte.Length;
                int startByte = 0;
                while (fileLength > 0)
                {
                    Application.DoEvents();
                    int downByte = srm.Read(bufferbyte, startByte, allByte);
                    if (downByte == 0) { break; };
                    startByte += downByte;
                    allByte -= downByte;
                    pbDownFile.Value += downByte;
                    float part = (float)startByte / 1024;
                    float total = (float)bufferbyte.Length / 1024;
                    int percent = Convert.ToInt32((part / total) * 100);

                    this.lblspeed.Text = percent.ToString() + "%";
                }

                string tempPath = tempUpdatePath + UpdateFile;
                //MessageBox.Show(tempPath.ToString());
                CreateDirtory(tempPath);
                FileStream fs = new FileStream(tempPath, FileMode.OpenOrCreate, FileAccess.Write);
                fs.Write(bufferbyte, 0, bufferbyte.Length);
                srm.Close();
                srmReader.Close();
                fs.Close();
            }
            catch (WebException ex)
            {
                MessageBox.Show("更新文件下载失败！" + ex.Message.ToString(), "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            //把文件复制到CopyUpdate上层文件夹下
            CopyFile(tempUpdatePath, path);
            System.IO.Directory.Delete(tempUpdatePath, true);
            //解压覆盖
            ZipHelper.Unzip();
            if (MessageBox.Show("更新成功", "", MessageBoxButtons.OK, MessageBoxIcon.Information) == DialogResult.OK)
            {
                string fileName = path + @"\" + dirName[dirName.Length - 1] + @"\bin\Debug\" + dirName[dirName.Length - 1] + ".exe";
                //MessageBox.Show(fileName);
                Process p = new Process();
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.FileName = fileName;
                p.StartInfo.CreateNoWindow = true;
                p.Start();
                System.Environment.Exit(System.Environment.ExitCode);
            }
        }
        //创建目录
        private void CreateDirtory(string path)
        {
            if (!File.Exists(path))
            {
                string[] dirArray = path.Split('\\');
                string temp = string.Empty;
                for (int i = 0; i < dirArray.Length - 1; i++)
                {
                    temp += dirArray[i].Trim() + "\\";
                    if (!Directory.Exists(temp))
                        Directory.CreateDirectory(temp);
                }
            }
        }
        //复制文件;
        public void CopyFile(string sourcePath, string objPath)
        {
            if (!Directory.Exists(objPath))
            {
                Directory.CreateDirectory(objPath);
            }
            string[] files = Directory.GetFiles(sourcePath);
            for (int i = 0; i < files.Length; i++)
            {
                string[] childfile = files[i].Split('\\');
                File.Copy(files[i], objPath + @"\" + childfile[childfile.Length - 1], true);
            }
            string[] dirs = Directory.GetDirectories(sourcePath);
            for (int i = 0; i < dirs.Length; i++)
            {
                string[] childdir = dirs[i].Split('\\');
                CopyFile(dirs[i], objPath + @"\" + childdir[childdir.Length - 1]);
            }
        }
    }

}

上次挂了下载的连接都没怎么有人看，用到的也不多，这个就不挂了，需要的可以留言