ASP.NET Core 1.0 DI의 Startup 클래스에 IHttpContextAccessor를 추가하는 방법은 무엇입니까?

Question

ASP.NET 핵심 RC 1에서는 다음 코드를 사용하여 컨텍스트 (페이지의 전체 주소) 값을 검색했습니다. 그런 다음이 값을 구성에 기록했습니다.

public class Startup 
{ 
     public IConfigurationRoot Configuration { get; set; } 
     private IHostingEnvironment CurrentEnvironment { get; set; } 
     private IHttpContextAccessor HttpContextAccessor { get; set; } 
     public Startup(IHostingEnvironment env, 
       IHttpContextAccessor httpContextAccessor) 
      {     
       var builder = new ConfigurationBuilder() 
        .SetBasePath(env.ContentRootPath) 
        .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true) 
        .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true); 

       if (env.IsDevelopment()) 
       { 
        builder.AddUserSecrets(); 
       } 
       builder.AddEnvironmentVariables(); 
       Configuration = builder.Build(); 
       CurrentEnvironment = env; 
       HttpContextAccessor = httpContextAccessor; 
      } 
     public void ConfigureServices(IServiceCollection services) 
     { 
     ... 

     services.AddOptions(); 
     services.Configure<WebAppSettings>(configuration); 
     services.Configure<WebAppSettings>(settings => 
     { 
      ... 
      settings.WebRootPath = CurrentEnvironment.WebRootPath; 
      settings.DomainUrl = HttpContextAccessor.HttpContext.Request.Host.ToUriComponent(); 
     }); 
     } 
    } 

이제 ASP.NET Core 1.0에서 프로젝트를 업데이트하기 시작했습니다. 하지만 다음과 같은 오류가 사이트의 발사시 :

System.InvalidOperationException Unable to resolve service for type 'Microsoft.AspNetCore.Http.IHttpContextAccessor' while attempting to activate 'MyProject.Startup'.

at Microsoft.Extensions.Internal.ConstructorMatcher.CreateInstance(IServiceProvider provider) at Microsoft.Extensions.Internal.ActivatorUtilities.CreateInstance(IServiceProvider provider, Type instanceType, Object[] parameters) at Microsoft.Extensions.Internal.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider provider, Type type) at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider provider, Type type) at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.LoadMethods(IServiceProvider services, Type startupType, string environmentName) at Microsoft.AspNetCore.Hosting.<>c__DisplayClass1_0.b__1(IServiceProvider sp) at Microsoft.Extensions.DependencyInjection.ServiceLookup.FactoryService.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ScopedCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.SingletonCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.<>c__DisplayClass12_0.b__0(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider) at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureStartup() at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices() at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

.NET Framework X64 v4.0.30319.42000 | Microsoft.AspNetCore.Hosting version 1.0.0-rtm-21431 | Microsoft Windows 6.1.7601 S

어떻게 응용 프로그램 시작시 IHttpContextAccessor 새 버전을받을 수 있나요?

Answer 1

더 이상 기본 서비스가 아닙니다. 당신은 UPDATE

services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>(); 
services.TryAddSingleton<IActionContextAccessor, ActionContextAccessor>(); 

Startup.cs

에 구성해야합니다 : ASP.NET 코어 2.1, the AddHttpContextAccessor helper extension method가 제대로 올바른 수명 (싱글)로 IHttpContextAccessor를 등록 하였다. 그래서, 위의 ASP.NET 코어 2.1에서 코드가 있어야한다

services.AddHttpContextAccessor(); 
services.TryAddSingleton<IActionContextAccessor, ActionContextAccessor>(); 

출처 : 당신이 닷넷 코어에 대한 주요 변경 보면 https://github.com/aspnet/Hosting/issues/793