如何使用温莎依赖注入ActionFilterAttributes

问题描述

我们已经看到如何<一个href=\"http://$c$cclimber.net.nz/archive/2009/02/10/how-to-use-ninject-to-inject-dependencies-into-asp.net-mvc.aspx\">NInject能做到这一点和AutoFac能做到这一点我试图弄清楚如何使用注入温莎城堡的依赖到MVC ActionFilters

Having seen how NInject can do it and AutoFac can do it I'm trying to figure out how to inject dependencies into MVC ActionFilters using Castle Windsor

目前我使用的是一个丑陋的静态IoC的辅助类来解决从构造code这样的依赖关系：

At the moment I'm using an ugly static IoC helper class to resolve dependencies from the constructor code like this:

public class MyFilterAttribute : ActionFilterAttribute
{
  private readonly IUserRepository _userRepository;
  public MyFilterAttribute() : this(IoC.Resolve<IUserRepository>()) { }
  public MyFilterAttribute(IUserRepository userRepository)
  {
     _userRepository = userRepository;
  }
}

我很想从我的过滤器去除静态反模式的IoC的事情。

I'd love to remove that static antipattern IoC thing from my filters.

任何提示为我怎么会去这样做，与温莎城堡？

Any hints to as how I would go about doing that with Castle Windsor?

和否，更换DI框架不是一个选项。

And no, changing DI framework is not an option.

推荐答案

请一个通用属性：MyFilterAttribute与男星采取类型作为参数 - 即是这样的：

Make a generic attribute: MyFilterAttribute with ctor taking a Type as argument - i.e. something like this:

public class MyFilterAttribute : ActionFilterAttribute {
    public MyFilterAttribute(Type serviceType) {
        this.serviceType = serviceType;
    }

    public override void OnActionExecuting(FilterExecutingContext c) {
        Container.Resolve<IFilterService>(serviceType).OnActionExecuting(c);
        // alternatively swap c with some context defined by you
    }

    // (...) action executed implemented analogously

    public Type ServiceType { get { return serviceType; } }
    public IWindsorContainer Container { set; get; }
}

然后用同样的方法，你指的是两篇文章，以便采取行动是如何被调用的控制，做你的WindsorContainer的手动注入的属性。

Then use the same approach as the two articles you are referring to, in order to take control of how actions are invoked, and do a manual injection of your WindsorContainer into the attribute.

用法：
    [MyFilter（typeof运算（IMyFilterService））]

Usage: [MyFilter(typeof(IMyFilterService))]

您实际的过滤器届时将实施IMyFilterService一类反过来应该实现IFilterService这可能是这个样子：

Your actual filter will then be in a class implementing IMyFilterService which in turn should implement IFilterService which could look something like this:

public interface IFilterService {
    void ActionExecuting(ActionExecutingContext c);
    void ActionExecuted(ActionExecutedContext c);
}

这样，你的过滤器甚至不会被捆绑到ASP.NET MVC，你的属性仅仅是一块元数据 - 它的方式实际上应该是！ ： - ）

This way your filter will not even be tied to ASP.NET MVC, and your attribute is merely a piece of metadata - the way it is actually supposed to be! :-)

这篇关于如何使用温莎依赖注入ActionFilterAttributes的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！