簡單注射器身份UserManager <AppUser，Int32>註冊錯誤

Question

我正在關注Onion體系結構並使用Identity Framework。在我的核心項目，我有：

public interface IUserRepository : IDisposable 
{ 
    // Repository methods....... 
} 

在我Architecture.Repository，我有

public class UserRepository : IUserRepository 
{ 
    // This is Identity UserManager 
    private readonly UserManager<AppUser, int> _userManager; 
    private readonly IAuthenticationManager _authenticationManager; 
    private bool _disposed; 

    public UserRepository(UserManager<User, int> userManager, 
     IAuthenticationManager authenticationManager) 
    { 
      _userManager = userManager; 
      _authenticationManager = authenticationManager; 
    } 
} 

在我的解決依賴的項目，我有：

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(IocConfig), 
    "RegisterDependencies")] 
namespace AdShad.Infrastructure.DependencyResolution 
{ 
    public class IocConfig 
    { 
     public static void RegisterDependencies() 
     { 
      var container = new Container(); 
      container.RegisterWebApiRequest<IUnitOfWork, UnitOfWork>(); 
      container.RegisterWebApiRequest<IUserRepository, UserRepository>(); 

      container.RegisterManyForOpenGeneric(typeof(IRepository<>), 
       typeof(BaseRepository<>).Assembly); 
      container.RegisterWebApiRequest<IEntitiesContext, MyContext>(); 

      container.RegisterWebApiRequest(
       () => HttpContext.Current.GetOwinContext().Authentication); 

      container.Verify(); 

      HttpConfiguration config = new HttpConfiguration 
      { 
       DependencyResolver = 
        new SimpleInjectorWebApiDependencyResolver(container) 
      }; 
     } 
    } 
} 

在container.Verify()，我我得到以下錯誤：

An exception of type 'System.InvalidOperationException' occurred in SimpleInjector.dll but was not handled in user code

Additional information: The configuration is invalid. Creating the instance for type IUserRepository failed. The registered delegate for type IUserRepository threw an exception. No registration for type UserManager could be found and an implicit registration could not be made. The constructor of type UserManager contains the parameter of type IUserStore with name 'store' that is not registered. Please ensure IUserStore is registered, or change the constructor of UserManager.

有人可以指導我做錯了什麼，我需要做些什麼來糾正它？

Answer 1

異常消息說：

The constructor of type UserManager<AppUser, int> contains the parameter of type IUserStore with name 'store' that is not registered. Please ensure IUserStore<AppUser, int> is registered, or change the constructor of UserManager.

例外建議你應該做一個登記IUserStore<AppUser, int>，因爲UserManager<AppUser, int>取決於此。所以，你可以爲實例進行以下注冊：

// UserStore<TUser> is defined in Microsoft.AspNet.Identity.EntityFramework. 
// Do note that UserStore<TUser> implements IUserStore<TUser, string>, so 
// this Entity Framework provider requires a string. If you need int, you 
// might have your own store and need to build your own IUserStore implemenation. 
container.Register<IUserStore<AppUser, string>>(
    () => new UserStore<AppUser>>(), 
    Lifestyle.Scoped); 

然而，根據this article，你不應該自動線框架結構類型，如UserManager<TUser, TKey>，而是用手工註冊的，而不是創建這種類型的自己。例如：

container.Register<UserManager<AppUser, string>>(
    () => new UserManager<AppUser, string>(new UserStore<AppUser>()), 
    Lifestyle.Scoped); 

它甚至會更好，不要直接在覈心應用程序使用的類型從外部庫（如UserManager<TUser, TKey>）。特別是因爲你正在練習洋蔥的建築。該體系結構促進了原理並描述了端口和適配器的概念。端口是由應用程序定義的抽象，允許網關進入某個外部域或庫。適配器是實際連接到此外部域或庫的這種抽象的實現。這正是Dependency Inversion Principle（五個SOLID原則之一）所描述的內容。

因此，而不是讓你UserRepository取決於框架類型，如UserManager<TUser, TKey>，讓它取決於customly定義的抽象，用very narrowly defined和single responsibility。此抽象的適配器可以使用UserManager<TUser, TKey>。

根據UserRepository的不同，您甚至可以將其本身作爲適配器。在這種情況下，讓UserRepository直接取決於UserManager<TUser, TKey>是好的。在這種情況下，將UserManager<TUser, TKey>隱藏在額外的抽象之後會導致額外/不必要的抽象層。

但是，適配器不僅可以直接依賴於UserManager<TUser, TKey>，但它可以簡單地控制UserManager<TUser, TKey>本身的創建和銷燬。換句話說，你可以UserRepository如下所示：

// NOTE: Do not let IUserRepository implement IDisposable. This violates 
// the Dependency Inversion Principle. 
// NOTE2: It's very unlikely that UserRepository itself needs any disposal. 
public class UserRepository : IUserRepository 
{ 
    // This is Identity UserManager 
    private readonly IAuthenticationManager _authenticationManager; 

    public UserRepository(IAuthenticationManager authenticationManager) 
    { 
      _authenticationManager = authenticationManager; 
    } 

    public void Delete(AppUser user) { 
     // Here we create and dispose the UserManager during the execution 
     // of this method. 
     using (manager = new UserManager<AppUser, string>(
      new UserStore<AppUser>())) { 
      manager.DeleteAsync(user).Result; 
     } 
    } 
} 

在簡單噴油器的討論有一個interesting description如何與身份和Visual Studio的默認模板的工作。並且here是一個關於標識的Stackoverflow q/a，您可能也會感興趣。