Mvc 3 / Unity 2将依赖项注入过滤器？

问题描述

如何注入以下依赖项？

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

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

        protected override bool AuthorizeCore(HttpContextBase httpContext)
        {
        }
}

我正在使用Unity 2来注入所有的控制器。有没有针对Unity 2的教程，并将依赖关系注入过滤器？

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有一个很好的系列服务位置，包括如何创建可以支持依赖注入的自己的过滤器提供程序：（向下滚动到将依赖注入添加到过滤器一节）。

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Application_Start global.asax.cs使UnityFilterAttributeFilterProvider成为您的MVC应用程序的过滤器提供程序。



。

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);

    // ...
}







• 装饰您希望Unity使用[Dependency]属性注入值的属性。然后你应该很好去。



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