Asp.Net Web Api和具有自定義授權屬性問題的Autofac（屬性注入）

Question

我正在使用Autofac注入我工作良好的所有項目依賴關係。現在我添加了一個自定義授權屬性（我不需要像OWIN和Identity這樣非常複雜的功能）。自定義授權屬性依賴於數據層，因此我試圖將其注入屬性注入。然而，該屬性始終爲空。該代碼是下面：該噴射AuthorizationHelper

public class CustomAuthorizationFilterAttribute : AuthorizeAttribute, IAutofacAuthorizationFilter 
{ 
    public IAuthorisationHelper AuthorisationHelper { get; set; } 

    public override void OnAuthorization(HttpActionContext actionContext) 
    { 
     **... removed for brevity** 

      **// TODO: this should be injected by autofac and is always null??** 
      if (AuthorisationHelper.IsValidUser(username, password, out roleOfUser)) 
      { 
       var principal = 
        new GenericPrincipal((new GenericIdentity(username)), 
         (new[] { roleOfUser })); 

       Thread.CurrentPrincipal = principal; 
       return; 
      } 

     ... removed for brevity 

    } 
} 

代碼：

public static IContainer Container() 
    { 
     var builder = new ContainerBuilder(); 
     var assemblies = new List<Assembly>(); 

     assemblies.Add(Assembly.Load("Kids.Math.Interfaces")); 
     assemblies.Add(Assembly.Load("Kids.Math.Data")); 
     assemblies.Add(Assembly.Load("Kids.Math.Business")); 
     assemblies.Add(Assembly.Load("Kids.Math.ImportExport")); 
     assemblies.Add(Assembly.Load("Kids.Math.Common")); 
     assemblies.Add(Assembly.Load("Kids.Math.Api")); 

     builder.RegisterAssemblyTypes(assemblies.ToArray()). 
      AsImplementedInterfaces(); 

     builder.RegisterType(typeof(MathContext)).As(typeof (DbContext)).InstancePerRequest(); 

     // Register web API controllers. 
     builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); 

     // TODO: this is not working, also this should be generic to register it for all controllers 
     // inject the authorisation filter 
     builder.RegisterType<AuthorisationHelper>().As<IAuthorisationHelper>(); 
     builder.Register(c => new CustomAuthorizationFilterAttribute()).PropertiesAutowired() 
      .AsWebApiAuthorizationFilterFor<QuestionsImportController>() 
      .InstancePerRequest(); 

     // Set the dependency resolver to be Autofac. 
     var container = builder.Build(); 
     return container; 
    } 

屬性被登記在一個FilterConfig作爲 filters.Add（新CustomAuthorizationFilterAttribute（））;

所有接線工作，但AuthorisationHelper始終爲空。

任何意見將不勝感激。

Answer 1

難道你錯過了一些關鍵的註冊步驟嗎？請參閱Autofac doco

// OPTIONAL: Register the Autofac filter provider. 
    builder.RegisterWebApiFilterProvider(config); 

    // Set the dependency resolver to be Autofac. 
    var container = builder.Build(); 
    config.DependencyResolver = new AutofacWebApiDependencyResolver(container); 

編輯：被告知，該配置已經正確安裝，你嘗試過註冊您的過濾器這樣的後？

builder.RegisterType<CustomAuthorizationFilterAttribute>().PropertiesAutowired() 
     .AsWebApiAuthorizationFilterFor<QuestionsImportController>() 
     .InstancePerRequest(); 

Answer 2

看起來這是一個已知的bug在autofac：

https://code.google.com/p/autofac/issues/detail?id=289