带有 Ninject 和 Filter 属性的依赖注入，用于 asp.net mvc [英] Dependency Injection with Ninject and Filter attribute for asp.net mvc

问题描述

我正在为 asp.net mvc 3 编写自定义授权过滤器.我需要向类中注入一个用户服务，但我不知道如何做到这一点.

I'm writing a custom Authorization Filter for asp.net mvc 3. I need to inject a userservice into the class but I have no idea how to do this.

public class AuthorizeAttribute : FilterAttribute, IAuthorizationFilter
{
    private IUserService userService;
    private string[] roles;

    public AuthorizeAttribute(params string[] roles)
    {
        this.roles = roles;
    }

    public void OnAuthorization(AuthorizationContext filterContext)
    {
        throw new NotImplementedException();
    }
}

我使用 ninject 进行依赖注入.我不想使用工厂或服务定位器模式.

I'm using ninject for dependency injection. I do not want to use a Factory or service locator pattern.

我的绑定在 global.acsx 中如下所示:

My bindings look like this in the global.acsx:

    internal class SiteModule : NinjectModule
    {
        public override void Load()
        {
            Bind<IUserService>().To<UserService>();
        }
    }

推荐答案

看到这个答案:自定义授权 MVC 3 和 Ninject IoC

如果你想使用构造函数注入，那么你需要创建一个属性和一个过滤器.

If you want to use constructor injection then you need to create an attribute and a filter.

/// Marker attribute
public class MyAuthorizeAttribute : FilterAttribute { }

/// Filter
public class MyAuthorizeFilter : IAuthorizationFilter
{
      private readonly IUserService _userService;
      public MyAuthorizeFilter(IUserService userService)
      {
          _userService = userService;
      }

      public void OnAuthorization(AuthorizationContext filterContext)
      {
          var validUser = _userService.CheckIsValid();

          if (!validUser)
          {
              filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary { { "action", "AccessDenied" }, { "controller", "Error" } });
          }
      }
}

绑定:

this.BindFilter<MyAuthorizeFilter>(System.Web.Mvc.FilterScope.Controller, 0).WhenControllerHas<MyAuthorizeAttribute>();

控制器:

[MyAuthorizeAttribute]
public class YourController : Controller
{
    // ...
}

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