NetCore插件化开发

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

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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(); }

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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privatestatic
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