百度网盘 做网站图床,网站建设游戏,我国档案网站建设比较分析,多版本wordpress为什么80%的码农都做不了架构师#xff1f; 作为main函数的程序启动文件UseStartup 默认就是调用我们的整个应用程序的启动文件
class Program{static void Main(string[] args){var host new WebHostBuilder().UseKestrel() // 指定WebServer为Kes… 为什么80%的码农都做不了架构师 作为main函数的程序启动文件UseStartup 默认就是调用我们的整个应用程序的启动文件
class Program{static void Main(string[] args){var host new WebHostBuilder().UseKestrel() // 指定WebServer为Kestrel.UseStartupStartUpB() // 配置WebHost.Build();host.Run(); // 启动WebHost}} UseStartup 首先这是IWebHostBuilder接口的扩展类这里有两个分支 1、如果StartUp从IStartup继承则直接以单例的方式加入插件服务框架中。 2、如果不是从IStartup继承则包装为IStartup后再以单例的方式加入插件服务框架中。 public static IWebHostBuilder UseStartup(this IWebHostBuilder hostBuilder, Type startupType){var startupAssemblyName startupType.GetTypeInfo().Assembly.GetName().Name;return hostBuilder.UseSetting(WebHostDefaults.ApplicationKey, startupAssemblyName).ConfigureServices(services {if (typeof(IStartup).GetTypeInfo().IsAssignableFrom(startupType.GetTypeInfo())){services.AddSingleton(typeof(IStartup), startupType);}else{services.AddSingleton(typeof(IStartup), sp {var hostingEnvironment sp.GetRequiredServiceIHostingEnvironment();ConventionBasedStartup类正是继承了IStartup。 LoadMethods 内部调用FindConfigureDelegate 就是为了找到 Configure{0}此方法 public void Configure(IApplicationBuilder app){ }return new ConventionBasedStartup(StartupLoader.LoadMethods(sp, startupType, hostingEnvironment.EnvironmentName));});}});} public class ConventionBasedStartup : IStartup{private readonly StartupMethods _methods;public ConventionBasedStartup(StartupMethods methods){_methods methods;}public void Configure(IApplicationBuilder app){try{_methods.ConfigureDelegate(app);}catch (Exception ex){if (ex is TargetInvocationException){ExceptionDispatchInfo.Capture(ex.InnerException).Throw();}throw;}}public IServiceProvider ConfigureServices(IServiceCollection services){try{return _methods.ConfigureServicesDelegate(services);}catch (Exception ex){if (ex is TargetInvocationException){ExceptionDispatchInfo.Capture(ex.InnerException).Throw();}throw;}}} public static StartupMethods LoadMethods(IServiceProvider hostingServiceProvider, Type startupType, string environmentName){var configureMethod FindConfigureDelegate(startupType, environmentName);var servicesMethod FindConfigureServicesDelegate(startupType, environmentName);object instance null;if (!configureMethod.MethodInfo.IsStatic || (servicesMethod ! null !servicesMethod.MethodInfo.IsStatic)){instance ActivatorUtilities.GetServiceOrCreateInstance(hostingServiceProvider, startupType);}FuncIServiceCollection, IServiceProvider configureServices services { return services.BuildServiceProvider();};return new StartupMethods(instance, configureMethod.Build(instance), configureServices);} private static ConfigureBuilder FindConfigureDelegate(Type startupType, string environmentName){var configureMethod FindMethod(startupType, Configure{0}, environmentName, typeof(void), required: true);return new ConfigureBuilder(configureMethod);} 这个是源码实现的了一个IStartup 但是在默认的项目中并没有使用这个
正常情况下我们继承StartupBase 此抽象类 实现 Configure(IApplicationBuilder app) 方法就可以了
public abstract class StartupBase : IStartup{public abstract void Configure(IApplicationBuilder app);IServiceProvider IStartup.ConfigureServices(IServiceCollection services){ConfigureServices(services);return CreateServiceProvider(services);}public virtual void ConfigureServices(IServiceCollection services){}public virtual IServiceProvider CreateServiceProvider(IServiceCollection services){return services.BuildServiceProvider();}} 总结最终情况就是我们的应用程序要启动文件必须满足一下方式就可以了 1、自己定义个类必须包含Configure方法 2、继承自IStartup实现所有方法 3、继承自StartupBase抽象类只需要实现Configure方法 转载于:https://my.oschina.net/stuyun/blog/3014524
