asp.net-web-api – Autofac,Owin,Webapi并注入AuthorizationSer

在这个示例代码中实际上有很多东西在起作用.

> SimpleAuthorizationServerProvider中的值是字段而不是属性,因此PropertiesAutowired不会对它们起作用.
>字段标记为只读,它们从未设置.
>您有UserManager< IdentityUser>注册为lambda但也有PropertiesAutowired不起作用 – 你只能在基于反射的组件上使用PropertiesAutowired(例如,RegisterType< T>).

考虑为您的提供者注册lambda并设置lambda中的所有内容：

builder.Register(c => {
  var p = new SimpleAuthorizationServerProvider();
  p.repository = c.Resolve<UserManager<IdentityUser>>();
  // ...and so on
  return p;
}).AsSelf().SingleInstance();

另外,请记住,如果您注册一个实例(或注册一些东西作为SingleInstance,属性将被解析一次,那就是它.所以,如果你有一些依赖是InstancePerDependency或InstancePerRequest,那就不会按你想象的方式工作 – 他们将被解决一次,之后有效地成为单身人士.

更新1

基于原始和更新的代码,我发现如果您可以查看一些Autofac文档以更好地了解它是如何工作的,那将是一件好事.例如,使用SimpleAuthorizationServerProvider中的字段表明您可能无法完全了解注入如何在Autofac中工作或如何正确注册事物,因此Autofac可以为您完成工作.

> Registration concepts
> Web API integration
> Working with per-request lifetime

例如,查看更新…

>您现在已经为SimpleAuthorizationServerProvider注册了lambda,但是我没有看到您在那里设置存储库字段的位置.
>您在SimpleAuthorizationServerProvider注册时不需要PropertiesAutowired,因为您正在注册lambda,并且属性不会自动装配(如前所述).
>我认为注册InstancePerRequest的唯一组件是AuthRepository,但就像我说的那样,我看不出那个被解析或设置的地方 – 而且这是唯一会产生你注意到的异常的东西. There is an FAQ on dealing with that exact exception that you should look into.

此外,您正在显示正在初始化的两个不同版本的OAuthServerOptions,并且很难分辨哪个版本是“真实的”.

我会建议一个相当重要的重构,以使事情能够正确地使用DI.

更改SimpleAuthorizationServerProvider以停止使用公共字段并将它们添加为构造函数参数,以便Autofac可以为您填充这些内容.

public class SimpleAuthorizationServerProvider
{
  public IAuthRepository Repository { get; private set; }
  public UserManager<IdentityUser> UserManager {get; private set; }
  public AuthContext Context { get; private set; }
  public SimpleAuthorizationServerProvider(
    IAuthRepository repository,UserManager<IdentityUser> userManager,AuthContext context)
  {
    this.Repository = repository;
    this.UserManager = userManager;
    this.AuthContext = context;
  }
}

在启动期间,修复您的注册以删除多余的内容并利用Autofac自动布线优势.

public class StartUp
{
  public void Configuration(IAppBuilder app)
  {
    var config = new HttpConfiguration();
    WebApiConfig.Register(config);

    var builder = new ContainerBuilder();
    builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

    // Register the auth context instance but skip
    // the extra .AsSelf() and .SingleInstance() because
    // it's implicit.
    builder.RegisterInstance(new AuthContext());

    // Use the lambda to resolve the auth context rather
    // than making a closure over an instance.
    builder.Register(c => new UserStore<IdentityUser>(c.Resolve<AuthContext>()))
           .As<IUserStore<IdentityUser>>();

    // Just register the provider type and let Autofac
    // do the work without all this manual stuff. Skip
    // the .AsSelf() because it's implicit if you don't
    // specify other interfaces and don't auto-wire properties
    // because you don't need it.
    builder.RegisterType<SimpleAuthorizationProvider>();

    // This is fine,but I can't tell where it's used - if
    // you are using it at app startup or OUTSIDE a request,// you will get that exception you noted. Also,unless
    // you're actually using property injection,lose the
    // .PropertiesAutowired() call.
    builder.RegisterType<AuthRepository>()
           .As<IAuthRepository>()
           .InstancePerRequest()
           .PropertiesAutowired();

    var container = builder.Build();
    var resolver = new AutofacWebApiDependencyResolver(container);
    config.DependencyResolver = resolver;

    app.UseAutofacMiddleware(container);
    app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
    app.UseWebApi(config);

    ConfigureOAuth(app,resolver);
  }

  public void ConfigureOAuth(IAppBuilder app,AutofacWebApiDependencyResolver resolver)
  {
    var options = new OAuthAuthorizationServerOptions()
    {
      AllowInsecureHttp = true,// If you want the values to be wired up,you have
      // to do a resolve. Note,however,that since you're
      // doing this wire-up at app startup,there's no request
      // scope,so if something in here is registered `InstancePerRequest`
      // you will get an exception.
      Provider =  resolver.GetService(typeof(SimpleAuthorizationServerProvider)) as SimpleAuthorizationServerProvider
    };

    app.USEOAuthAuthorizationServer(options);
    app.USEOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
  }
}

假设所有代码都应该没问题.如果没有设置东西 – 就像SimpleAuthorizationServerProvider属性中的一个属性为null,或者因为它缺少依赖项而得到异常,或者如果你得到关于没有请求范围的异常……那么还有其他东西要去你没有提出你的问题.

再次,请花时间查看文档并熟悉Autofac.我认为你遇到的许多麻烦都是因为对事情的联系有些误解.