Mvc 3/Unity 2 将依赖项注入过滤器? [英] Mvc 3/Unity 2 inject dependencies into a Filter?

问题描述

如何注入以下依赖项??

How can i inject the following dependencies ??

public class Authenticate : AuthorizeAttribute
{
        [Dependency]
        public IAuthenticate AuthenticateLibrary { get; set; }

        [Dependency]
        public ILibrary BaseLibrary { get; set; }

        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
        }
}

我使用 Unity 2 注入所有控制器.是否有 Unity 2 和将依赖项注入过滤器的教程?

I am using Unity 2 to inject all the controllers. Is there a tutorial for Unity 2 and injecting dependencies into filters?

推荐答案

Brad Wilson 有一个关于 Service Location 的很好的系列，其中包括如何创建您自己的可以支持依赖注入的过滤器提供程序:http://bradwilson.typepad.com/blog/2010/07/service-location-pt4-filters.html(向下滚动到向过滤器添加依赖注入"部分).

Brad Wilson has a good series on Service Location which includes how to create your own filter provider that can support dependency injection: http://bradwilson.typepad.com/blog/2010/07/service-location-pt4-filters.html (Scroll down to the section "Adding Dependency Injection to Filters").

• 复制他为 UnityFilterAttributeFilterProvider.cs 提供的代码.

UnitFilterAttributeFilterProvider.cs

using System.Collections.Generic;
using System.Web.Mvc;
using Microsoft.Practices.Unity;

public class UnityFilterAttributeFilterProvider : FilterAttributeFilterProvider {
    private IUnityContainer _container;

    public UnityFilterAttributeFilterProvider(IUnityContainer container) {
        _container = container;
    }

    protected override IEnumerable<FilterAttribute> GetControllerAttributes(
                ControllerContext controllerContext,
                ActionDescriptor actionDescriptor) {

        var attributes = base.GetControllerAttributes(controllerContext,
                                                      actionDescriptor);
        foreach (var attribute in attributes) {
            _container.BuildUp(attribute.GetType(), attribute);
        }

        return attributes;
    }

    protected override IEnumerable<FilterAttribute> GetActionAttributes(
                ControllerContext controllerContext,
                ActionDescriptor actionDescriptor) {

        var attributes = base.GetActionAttributes(controllerContext,
                                                  actionDescriptor);
        foreach (var attribute in attributes) {
            _container.BuildUp(attribute.GetType(), attribute);
        }

        return attributes;
    }
}

• 修改 global.asax.cs 的 Application_Start，使 UnityFilterAttributeFilterProvider 成为您的 MVC 应用的过滤器提供程序.

.

protected void Application_Start() {
    // ...

    var oldProvider = FilterProviders.Providers.Single(
        f => f is FilterAttributeFilterProvider
    );
    FilterProviders.Providers.Remove(oldProvider);

    var container = new UnityContainer();
    var provider = new UnityFilterAttributeFilterProvider(container);
    FilterProviders.Providers.Add(provider);

    // ...
}

• 使用 [Dependency] 属性装饰您希望 Unity 为其注入值的属性.然后你就可以出发了.

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