我升级 nacos-sdk 到 1.3.5 修改源代码提示 Ocelot.Provider.Nacos.NacosClient.V2.RegSvcBgTask' has been registered

[ganqiyin]

Microsoft.AspNetCore.Hosting.Diagnostics[6]
Application startup exception
System.AggregateException: One or more errors occurred. (No service for type 'Ocelot.Provider.Nacos.NacosClient.V2.RegSvcBgTask' has been registered.)
---> System.InvalidOperationException: No service for type 'Ocelot.Provider.Nacos.NacosClient.V2.RegSvcBgTask' has been registered.
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
at Ocelot.Provider.Nacos.NacosClient.V2.ServiceCollectionExtensions.UseNacosAspNet(IApplicationBuilder app, IHostApplicationLifetime lifetime, CancellationToken cancellationToken) in D:\SourceCode\Ocelot.Provider.Nacos\src\Ocelot.Provider.Nacos\NacosClient\V2\ServiceCollectionExtensions.cs:line 56
at Ocelot.Provider.Nacos.NacosMiddlewareConfigurationProvider.<>c.<.cctor>b__3_0(IApplicationBuilder builder) in D:\SourceCode\Ocelot.Provider.Nacos\src\Ocelot.Provider.Nacos\NacosMiddlewareConfigurationProvider.cs:line 23
at Ocelot.Middleware.OcelotMiddlewareExtensions.CreateConfiguration(IApplicationBuilder builder)
at Ocelot.Middleware.OcelotMiddlewareExtensions.UseOcelot(IApplicationBuilder builder, OcelotPipelineConfiguration pipelineConfiguration)
at Ocelot.Middleware.OcelotMiddlewareExtensions.UseOcelot(IApplicationBuilder builder)
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at ApiGatewayDemo.Startup.Configure(IApplicationBuilder app, IWebHostEnvironment env) in D:\SourceCode\Ocelot.Provider.Nacos\demo\ApiGatewayDemo\Startup.cs:line 50
at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)
at Microsoft.AspNetCore.MiddlewareAnalysis.AnalysisStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder builder)
at Microsoft.WebTools.BrowserLink.Net.HostingStartup.<>c__DisplayClass1_0.b__0(IApplicationBuilder app)
at Microsoft.AspNetCore.Watch.BrowserRefresh.HostingStartup.<>c__DisplayClass1_0.b__0(IApplicationBuilder app)
at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)
Dispose

[ganqiyin]

地址 https://github.com/ganqiyin/Ocelot.Provider.Nacos/tree/master/src/Ocelot.Provider.Nacos

[ganqiyin]

把 AddHostService 改成 services.AddSingleton(); 是为啥？