有winform程序 LWH.exe，现需要实现远程升级功能，参考网上的相关方案实现步骤如下：
1、在远程服务器上建立FTP站点，将更新文件及更新信息放到相关文件夹中
其中，updates.json内容如下：
{"latestversion": "3.0.3","downloadurl": "http://***.***.***.***:****/lwh/update303.zip","changelog": "更改注册机制","mandatory": true}
latestversion代表提供更新的版本号，downloadurl表示更新包的下载路径，这里将需要更新的文件压缩成zip文件
update303.zip即为需要更新的文件
2、在工程下App.config中添加key为Version的字段来表示当前软件版本号
<configuration>...<appSettings><add key="Version" value="3.0.2" /></appSettings></configuration>
在生成的文件中该.config对应的是 应用程序名.exe.config，比如我的应用程序 是LWH.exe，则在打包更新包时应将LWH.exe.config一起打包，这样更新完软件后，软件版本号则更新到新的版本号
程序中获取当前版本号的代码为：
version = System.Configuration.ConfigurationManager.AppSettings["Version"].ToString();
3、在解决方案中，新建一个winform应用项目update，用以从服务器上下载更新包，并解压到指定文件夹替换相关文件实现更新
放置一个progressBar用来表示下载进度，放置一个label用来进行提示，代码如下：
private string url;//下载路径public static FastZip fz = new FastZip();public update(string[] args){InitializeComponent();if (args == null || args.Count() == 0)url = "http://***.***.***.***:**/lwh/update.zip";//没有传入地址时使用默认地址elseurl = args[0];}private void update_Load(object sender, EventArgs e){updateprocess();}private void updateprocess(){try{WebClient wc = new WebClient();wc.DownloadProgressChanged += wc_DownloadProgressChanged;wc.DownloadFileAsync(new Uri(url), Application.StartupPath + "\\update.zip");}catch(Exception er){label1.Text = "下载失败："+er.Message;}}private void wc_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e){Action act = () =>{this.progressBar1.Value = e.ProgressPercentage;this.label1.Text = "正在下载...";//this.label1.Text = e.ProgressPercentage + "%";};this.Invoke(act);if (e.ProgressPercentage == 100){//下载完成之后开始覆盖this.label1.Text = "正在解压...";try{var result = Compress(Application.StartupPath, Application.StartupPath + "\\update.zip",null);//var result = unZip(Application.StartupPath + "\\update.rar", @"..\LWH\");if (result== "Success!"){progressBar1.Value = 100;this.label1.Text = "准备安装...";//备份之前数据库var dbFile = Application.StartupPath + "/Data/TestDb.db";if (File.Exists(dbFile)){var bakFile = Application.StartupPath + "/backup/" + DateTime.Now.ToString("yyyyMMddHHmmssms") + ".bak";var bakDirectory = Path.GetDirectoryName(bakFile);DirectoryInfo directoryInfo = new DirectoryInfo(bakDirectory);if (!directoryInfo.Exists){directoryInfo.Create();}else{//删除7天前的备份文件var files = directoryInfo.GetFiles();if (files != null && files.Length > 0){foreach (var file in files){if (file.CreationTime.AddDays(7) < DateTime.Now){file.Delete();}}}}//备份文件File.Move(dbFile, bakFile);}this.label1.Text = "更新完成";var mainFile =Application.StartupPath+"/LWH.exe";//重新启动软件Process p = new Process();p.StartInfo.UseShellExecute = false;p.StartInfo.RedirectStandardOutput = true;p.StartInfo.FileName = mainFile;p.StartInfo.CreateNoWindow = true;p.Start();this.Close();}else{MessageBox.Show("更新失败:"+result);this.Close();}}catch (Exception ex){MessageBox.Show("更新失败", ex.Message);this.Close();}}}/// <summary>/// 解压Zip/// </summary>/// <param name="DirPath">解压后存放路径</param>/// <param name="ZipPath">Zip的存放路径</param>/// <param name="ZipPWD">解压密码（null代表无密码）</param>/// <returns></returns>public string Compress(string DirPath, string ZipPath, string ZipPWD){string state = "Fail!";try{fz.Password = ZipPWD;fz.ExtractZip(ZipPath, DirPath, "");state = "Success!";}catch (Exception ex){state += "," + ex.Message;}return state;}
4、将生成的update.exe拷贝到主应用程序(LWH.exe)软件目录下以供调用，在LWH的检测更新按键下加入以下代码：
private void buttonXUpdate_Click(object sender, EventArgs e){try{string rXml = string.Empty;HttpWebRequest myHttpWebRequest = .WebRequest.Create(backdata.updateUrl) as HttpWebRequest;myHttpWebRequest.KeepAlive = false;myHttpWebRequest.AllowAutoRedirect = false;myHttpWebRequest.UserAgent = "Mozilla/5.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";myHttpWebRequest.Timeout = 5000;myHttpWebRequest.ContentType = "application/x-www-form-urlencoded;charset=utf-8";using (HttpWebResponse res = (HttpWebResponse)myHttpWebRequest.GetResponse()){if (res.StatusCode == HttpStatusCode.OK || res.StatusCode == HttpStatusCode.PartialContent)//返回为200或206{string dd = res.ContentEncoding;System.IO.Stream strem = res.GetResponseStream();System.IO.StreamReader r = new System.IO.StreamReader(strem);rXml = r.ReadToEnd();}else{MessageBox.Show("无法连接到远程服务器");return;}}updateInf updateinf = JsonConvert.DeserializeObject<updateInf>(rXml);if (pare(updateinf.latestversion, version) > 0){if (MessageBox.Show("有新版本：" + updateinf.latestversion + "\r\n" + "更新内容：" + updateinf.changelog + "\r\n是否进行更新?", "提示", MessageBoxButtons.OKCancel) == DialogResult.Cancel){return;}var mainFile = Application.StartupPath + @"\update.exe";Process p = new Process();p.StartInfo.UseShellExecute = false;p.StartInfo.RedirectStandardOutput = true;p.StartInfo.FileName = mainFile;p.StartInfo.CreateNoWindow = true;p.StartInfo.Arguments = updateinf.downloadurl;p.Start();this.Close();}else{MessageBox.Show("没有更新版本了！");}}catch(Exception er){MessageBox.Show("检查更新出现错误:" + er.Message);}}
updateInf为定义的更新文件信息类：
public class updateInf{public string latestversion;public string downloadurl;public string changelog;public string mandatory;}
点击“检查更新”按键后，首先从服务器读取updates.json，解析出服务器上的版本号和当前软件的版本进行比对，如果比当前版本新，则提示进行更新，如果选择进行更新则启动update.exe并传入updates.json中提供的更新包下载地址，启动后立即关闭主程序。
最后，可以对update稍作修改，在启动的时候传入参数中再增加exe名称，如
public update(string[] args){InitializeComponent();if (args == null || args.Count() < 2){//url = "http://116.63.143.64:9010/lwh/update.zip";}else{url = args[0];exename = args[1];}}
升级完毕时，重启程序 改成：
if (exename != ""){var mainFile = Application.StartupPath +"/"+ exename;Process p = new Process();p.StartInfo.UseShellExecute = false;p.StartInfo.RedirectStandardOutput = true;p.StartInfo.FileName = mainFile;p.StartInfo.CreateNoWindow = true;p.Start();this.Close();}
这就可以将update很便捷地添加到其他工程里面实现远程升级功能
