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所属分类：.NET技术
使用NetCore3.1完成框架基本开发后实际应用于项目，需要保证框架的独立性与项目的个性化， 就需要类似于下图的插件化形式将项目放入框架这个容器中启动，下面开始详细介绍实现步骤
项目dll扫描
在框架根目录创建Plugin文件夹，项目在生成后事件使用copy命令拷贝至Plugin文件夹，框架启动时会扫描该文件夹并进行ShadowCopy到PluginTemplate文件夹中
private static void ScanPlugin() { if (!PluginFolder.Exists) { PluginFolder.Create(); } if (!TempPluginFolder.Exists) { TempPluginFolder.Create(); } TempPluginFolder.Attributes = FileAttributes.Normal & FileAttributes.Directory; PluginFolder.Attributes = FileAttributes.Normal & FileAttributes.Directory; //清理临时文件。 foreach (var file in TempPluginFolder.GetFiles("*.dll", SearchOption.AllDirectories)) { try { File.SetAttributes(file.FullName, FileAttributes.Normal); file.Delete(); } catch (Exception e) { throw new Exception("请检查IIS权限"); } } //复制插件进临时文件夹。 foreach (var plugin in PluginFolder.GetFiles("*.dll", SearchOption.AllDirectories)) { try { string CopyFilePath = Path.Combine(TempPluginFolder.FullName, plugin.Name); File.Copy(plugin.FullName, CopyFilePath, true); File.SetAttributes(CopyFilePath, FileAttributes.Normal); } catch (Exception e) { throw new Exception("请检查IIS权限"); } } }
项目dll加载
直接使用ApplicationParts加载AssemblyPart即可
public static void LoadPlugin() { ScanPlugin(); IEnumerable<Assembly> AssemblyList = GetPluginAssemblies(); foreach (Assembly assembly in AssemblyList) { foreach (var type in assembly.GetTypes()) { if (type.IsAssignableFrom(typeof(Controller)) && type.Name.Contains("Controller") && type.IsClass && !type.IsAbstract) { string Name = type.Name; //如果有自定义的路由注解 if (type.IsDefined(typeof(Route), false)) { var areaattribute = type.GetCustomAttributes(typeof(Route), false).FirstOrDefault(); Name = ((Route)areaattribute).Name; Name += "Controller"; } if (!ControllerTypeDic.ContainsKey(Name)) { ControllerTypeDic.Add(Name, type); } } } var controllerAssemblyPart = new AssemblyPart(assembly); CloudUtil.GetBuilder().ConfigureApplicationPartManager(apm => { apm.ApplicationParts.Add(controllerAssemblyPart); }); } CloudUtil.GetBuilder().SetCompatibilityVersion(CompatibilityVersion.Version_3_0); StartPluginRefreshWatch(); }
项目视图
项目的cshtml视图文件可以手动拷贝到部署的框架Views文件夹中（正式环境），也可以通过监控当前项目的Views文件夹，如果变动进行自动拷贝（开发环境）
private static void StartPluginRefreshWatch() { _FileSystemWatcher.Path = CloudUtil.GetContentPath() + "/Plugin"; _FileSystemWatcher.Filter = "*.dll"; _FileSystemWatcher.Changed += _FileSystemWatcher_Changed; _FileSystemWatcher.IncludeSubdirectories = true; _FileSystemWatcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size; _FileSystemWatcher.EnableRaisingEvents = true; if (AppConfigUtil.Configuration["Frame:ViewsPublishType"]=="AutoCopy" && !string.IsNullOrEmpty(AppConfigUtil.Configuration["Frame:ViewsVirtualPath"]) && Directory.Exists(AppConfigUtil.Configuration["Frame:ViewsVirtualPath"])) { FileSystemWatcher ViewsWatcher = new FileSystemWatcher(); ViewsWatcher.Path = AppConfigUtil.Configuration["Frame:ViewsVirtualPath"]; ViewsWatcher.Changed += ViewsWatcher_Changed; ViewsWatcher.IncludeSubdirectories = true; ViewsWatcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size; ViewsWatcher.EnableRaisingEvents = true; //系统启动时整个文件夹拷贝 DirectoryInfo FrameWorkViews = new DirectoryInfo(CloudUtil.GetContentPath() + "/Views"); DirectoryInfo ProjectViews = new DirectoryInfo(AppConfigUtil.Configuration["Frame:ViewsVirtualPath"]); foreach (DirectoryInfo FDir in FrameWorkViews.GetDirectories()) { foreach (DirectoryInfo PDir in ProjectViews.GetDirectories()) { if (PDir.Name== FDir.Name) { FileUtil.DeleteDirectoryContent(FDir.FullName); } } } FileUtil.CopyDirectory(AppConfigUtil.Configuration["Frame:ViewsVirtualPath"],CloudUtil.GetContentPath() + "/Views", true); } }
项目dll热更新
监控Plugin文件夹，若有变调用IApplicationLifetime的StopApplication重启系统
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IConfiguration configuration, Microsoft.AspNetCore.Hosting.IApplicationLifetime applicationLifetime) { CloudUtil.SetAPP(applicationLifetime); } private static void _FileSystemWatcher_Changed(object sender, FileSystemEventArgs e) { CloudUtil.Restrat(); } public static void Restrat() { APP.StopApplication(); }
