这篇文章主要介绍“如何开发NetCore插件”，在日常操作中，相信很多人在如何开发NetCore插件问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何开发NetCore插件”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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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
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");
}
}
}直接使用ApplicationParts加载AssemblyPart即可
public static void LoadPlugin()
{
ScanPlugin();
IEnumerable 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);
}
}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();
}到此，关于“如何开发NetCore插件”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注创新互联网站，小编会继续努力为大家带来更多实用的文章！
