c# - ActionFilterAttribute 的 Ninject 2 属性注入(inject)不起作用

Question

我有一个方法属性，它期望 Ninject 2 注入(inject)几个属性，但是 userSession 和 jobRepository 出现为 null:

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
public class JobAttribute : ActionFilterAttribute {
    [Inject]
    private IUserSession userSession;

    [Inject]
    private IJobRepository jobRepository;

    public override void OnActionExecuting(ActionExecutingContext filterContext) {
        var filter = new JobFilter(userSession, jobRepository);

        filter.OnActionExecuting(filterContext);
    }
}

这是 Controller 中的方法:

[AcceptGet, Job]
public ActionResult Dimensions(Job job) {
    return View(job.Building);
}

我知道我的设置工作正常，因为如果我在 Controller 上使用构造函数注入(inject)， Controller 的参数就会被注入(inject)。尽管需要使用属性注入(inject)，但这对我的属性没有太大帮助。我在这里遗漏了什么吗？

以下是 Global.asax.cs 的相关部分:

public class MvcApplication : Ninject.Web.Mvc.NinjectHttpApplication {
    protected override void OnApplicationStarted() {
        RegisterRoutes(RouteTable.Routes);
        RegisterAllControllersIn(Assembly.GetExecutingAssembly());
    }

    ...snip...

    protected override IKernel CreateKernel() {
        return new StandardKernel(
            new RepositoryConfiguration(),
            new AuthenticationModule(),
            new AutoMapperConfiguration()
        );
    }
}

public class RepositoryConfiguration : NinjectModule {
    public override void Load() {
        Bind<ICustomerRepository>().To<CustomerRepository>();
        Bind<IJobRepository>().To<JobRepository>();
    }
}

public class AuthenticationModule : NinjectModule {
    public override void Load() {
        Bind<MbdQuote.Core.AppService.IUserSession>().To<UserSession>();
    }
}

Answer 1

Ninject2 不进行字段注入(inject)，将它们更改为具有公共(public) setter 的属性。

class JobAttribute : ActionFilterAttribute {
    [Inject]
    public IUserSession UserSession
    { set; private get; }

    [Inject]
    public IJobRepository JobRepository
    { set; private get; }
}

来自 Ninject 2 Beta announcement :

Things that were in Ninject 1.x that are not in Ninject 2:

• Field injection: Ninject 2’s injection is now driven by expression trees, and in .NET 3.5 there is no way to set field values with an expression tree. Since this is a bad practice anyway, I decided to cut it.