C# WinForm实现自动更新程序的方法详解

目录

• 开发环境
• 开发工具
• 实现代码
• 实现效果
• 代码解析

这一篇就着重写一下客户端的代码，客户端主要实现的有：启动后检测本地的XML文件，然后发送到服务器获取需要更新的文件以及版本列表。循环下载。下载成功后，备份原始文件->复制到主目录（若失败进行回滚）->修改本地xml文件，更新完成后打开主程序。

开发环境

.NET Core 3.1

开发工具

Visual Studio 2019

实现代码

/// <summary>
        /// 更新自己
        /// </summary>
        private void CopyRun() {

            string runPath = Process.GetCurrentProcess().MainModule.FileName;
            string runName = Path.GetFileName(runPath);

            if(!runName.StartsWith("_")) {
                string copyPath = runPath.Replace(runName, "_" + runName);
                byte[] bytes;
                using(FileStream fileStream = new FileStream(runPath, FileMode.Open, FileAccess.Read)) {
                    bytes = new byte[fileStream.Length];
                    fileStream.Read(bytes, 0, bytes.Length);
                }
                using(FileStream fileStream = new FileStream(copyPath, FileMode.Create, FileAccess.Write)) {
                    fileStream.Write(bytes);
                }

                ProcessStartInfo info = new ProcessStartInfo(copyPath, _runApp);
                Process.Start(info);
                Environment.Exit(0);
            }

        }

        /// <summary>
        /// 更新UI
        /// <http://www.devze.com;/summary>
        /// <param name="actoin"></param>
        private void UpdateUI(Action actoin) {
            if(this.InvokeRequired) {
                this.BeginInvoke(actoin);
            }
            else {
                actoin();
            }
        }

        /// <summary>
        /// 获取本地更新地址
        /// </summary>
        /// <returns></returns>
        private string GetUpdateUrl() {
            XElement xele = XElement.Load(updateXml);
            string url = xele.Element("url").Value;
            return url;
        }

        /// <summary>
        /// 获取本地更新文件
        /// </summary>
        /// <returns></returns>
        private string GetUpdateFiles() {
            XDocument xdoc = XDocument.Load(updateXml);
            var files = from f in xdoc.Root.Element("files").Elements() select new { name = f.Attribute("name").Value, vers开发者_开发入门ion = f.Attribute("version").Value };
            return jsonConvert.SerializeObject(files);
        }

        /// <summary>
        /// 更新完成后修改版本文件
        /// </summary>
        /// <param name="list"></param>
        private void UpdateXml(List<UpdateModel> list) {
            XDocument xdoc = XDocument.Load(updateXml);
            foreach(var model in list) {
                var ele_files = xdoc.Root.Element("files");

                XElement xele = ele_files.Elements().FirstOrDefault(s => s.Attribute("name").Value == model.name);
                if(xele != null) {
                    xele.SetAttributeValue("version", model.version);
                }
                else {
                    XElement addXele = new XElement("file");
                    addXele.SetAttributeValue("name", model.name);
                    addXele.SetAttributeValue("version", model.version);
                    ele_files.Add(addXele);
                }
            }
            xdoc.Save(updateXml);
        }

readonly string _runApp;
        public Form_update(string runApp) {
            InitializeComponent();
            _runApp = runApp;
            //CopyRun();
        }
        readonly string updateXml = Application.StartupPath + "UpdateList.xml";
        private void btn_update_Click(object sender, EventArgs e) {
            #region 设置ui
            btn_update.Enabled = false;
            label_status.Text = "正在更新";
            #endregion

            #region 初始化路径
            string savePath = Application.StartupPath + "temp_update\\";
            string backPath = Application.StartupPath + "temp_back\\";
            if(Directoandroidry.Exists(savePath)) {
                Directory.Delete(savePath, true);
            }
            Directory.CreateDirectory(savePath);

            if(Directory.Exists(backPath)) {
                Directory.Delete(backPath, true);
            }
            Directory.CreateDirectory(backPath);

            #endregion

            #region 图标旋转
            int angle = 0;
            Image img = pictureBox1.BackgroundImage;

            System.Threading.Timer timer = new System.Threading.Timer(s => {
                UpdateUI(() => {
                    angle = angle == 360 ? 0 : angle + 10;
                    pictureBox1.BackgroundImage = img.RotateImage(angle);
                });
            }, null, 0, 100);
            #endregion

            #region 下载更新
            string url = GetUpdateUrl();
            bool isSuccess = false;
            Task.Run(() => {
                try {
                    //获取下载列表
                    HttpResult httpResult = HttpUtil.HttpRequest(new HttpItem(url + "GetUpdateFiles", requestData: GetUpdateFiles()));
                    if(httpResult.Status) {
                        UpdateModel_Out output = JsonConvert.DeserializeObject<UpdateModel_Out>(httpResult.HttpStringData);

                        if(output.u编程pdateList.Count == 0) {
                            throw new Exception("当前已是最新版本");
                        }

                        UpdateUI(() => {
                            progressBar1.Maximum = output.updateList.Count + 1;
                        });
                        //循环下载文件
                        for(int i = 0; i < output.updateList.Count; i++) {

                            UpdateModel updateModel = output.updateList[i];
                            #region 进度条
                            UpdateUI(() => {
                                label_status.Text = $"正在更新第 {i + 1}/{output.updateList.Count} 个文件,文件名：{updateModel.name}";
                                progressBar1.Value = i + 1;
                            });
                            #endregion

                            #region 下载文件
                            httpResult = HttpUtil.HttpRequest(new HttpItem(url + "DownloadFile", requestData: JsonConvert.SerializeObject(updateModel)));
                            if(httpResult.Status) {
                                using(FileStream fileStream = new FileStream(savePath + updateModel.name, FileMode.Create)) {
                                    fileStream.Write(httpResult.HttpByteData, 0, httpResult.HttpByteData.Length);
                                }
                            }
                            else {
                                throw new Exception(updateModel.name + "下载失败,请重试");
                            }
                            #endregion

                            Task.Delay(1000).Wait();
                        }

                        #region 备份
                        UpdateUI(() => {
                            label_status.Text = "正在备份";
                        });
                        try {
                            File.Copy(updateXml, backPath + "UpdateList.xml");
                            foreach(var file in output.updateList) {
                                if(File.Exists(Application.StartupPath + file.name)) {
                                    File.Copy(Application.StartupPath + file.name, backPath + file.name, true);
                                }
                            }
                        }
                        catch { }
                        #endregion

                        #region 完成更新
                        UpdateUI(() => {
                            label_status.Text = "正在完成更新";
                        编程客栈    progressBar1.Value = progressBar1.Maximum;
                        });
                        string[] files = Directory.GetFiles(savePath);
                        try {
                            #region 更新成功
                            foreach(string file in files) {
                                File.Copy(file, Application.StartupPath + Path.GetFileName(file), true);
                            }
                            Directory.Delete(savePath, true);
                            #region 保存最新版本
                            UpdateXml(output.updateList);
                            isSuccess = true;
                            UpdateUI(() => {
                                label_status.Text = "更新完成";
                            });
                            #endregion
                            #endregion
                        }
                        catch {
                            #region 失败回滚
                            UpdateUI(() => {
                                label_status.Text = "更新失败，正在回滚";
                            });
                            string[] files_back = Directory.GetFiles(backPath);
                            foreach(string file in files_back) {
                                File.Copy(file, Application.StartupPath + Path.GetFileName(file), true);
                            }
                            File.Copy(backPath + "UpdateList.xml", updateXml, true);
                            UpdateUI(() => {
                                label_status.Text = "回滚完成";
                            });
                            return;
                            #endregion
                        }
                        #endregion
                    }
                    else {
                        throw new Exception("获取更新列表失败");
                    }
                }
                catch(Exception ex) {
                    UpdateUI(() => {
                        label_status.Text = "更新失败！" + ex.Message;
                        btn_update.Enabled = true;
                    });
                }
                finally {
                    UpdateUI(() => {
                        timer.Change(-1, -1);
                        pictureBox1.BackgroundImage = img;
                        if(isSuccess) {
                            if(File.Exists(_runApp)) {
                                if(MessageBox.Show("更新完成,是否打开程序", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) {
                                    Process.Start(_runApp);
                                }
                                Environment.Exit(0);
                            }
                        }
                    });
                }
            });
            #endregion

        }

        private void btn_close_Click(object sender, EventArgs e) {
            Close();
        }

        private void panel1_Paint(objechttp://www.devze.comt sender, PaintEventArgs e) {
            Pen pen = new Pen(Color.LightGray);
            e.Graphics.DrawLine(pen, new Point(36, 36), new Point(panel1.Width - 36, 36));
        }

实现效果

代码解析

主要注释已经在代码中标注了，由于基本都是在线程中进行操作的，所以在更新UI的时候封装了UpdateUI方法，然后就是加了一个定时器实现图标的旋转。关于CopyRun（更新自己）方法，就是用来更新自动更新程序本身的，即运行之前复制一份本身，然后启动复制的程序，否则本身正在运行的时候是不能更新自己的。

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