错误与简单ActionFilterAttribute运行 [英] Error on run with simple ActionFilterAttribute

问题描述

开始写一个简单的过滤器，从每个动作负载要求拉一些东西，复制从其他stackoverflows一些code，看起来像这样：

Started writing a simple filter to pull some stuff from request on each action load, copied some code from other stackoverflows that looks like so:

public class TestKeyAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext context)
    {
        if (context.Request.Properties.ContainsKey("test"))
        {
        // do stuff
        }
    }
}

然后加入其余的属性：

Then added the attribute with the rest:

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    GlobalConfiguration.Configuration.Filters.Add(new ElmahHandledErrorLoggerFilter());
    filters.Add(new HandleErrorAttribute());
    filters.Add(new TestKeyAttribute());
}

在运行，导致此错误：

The given filter instance must implement one or more of the following filter
interfaces: IAuthorizationFilter, IActionFilter, IResultFilter, IExceptionFilter.

大多数我发现的链接涉及到MVC 3，这似乎工作;但是我使用MVC 4并使用Web API - ？有一些其他办法，我现在需要注册的属性。

Most of the links I've found relate to MVC 3, and this seems to work; I am however using MVC 4 and using Web API - is there some other way I need to register the attribute now?

刚一说明：我不想连接到网络API控制器过滤器（它添加到GlobalConfiguration.Configuration.Filters没有工作，虽然），而是正常的网络控制器

Just a note: I don't want the filter attached to Web API controllers (adding it to GlobalConfiguration.Configuration.Filters does work, though), but rather the normal web controllers.

编辑：我知道我可以从IActionFilter继承，而不是使用OnActionExecuting，我只是好奇为什么这种方法是行不通的，因为一堆教程，得到这个工作似乎说应该。

I know I can get this working by inheriting from IActionFilter instead and using OnActionExecuting, I'm just curious why this approach doesn't work, since a bunch of tutorials seem to say it should.

推荐答案

在使用MVC4，你的自定义属性所在，必须包含对System.Web.Http.Common库的引用该项目。我使用的NuGet哎preSTO把它添加到我的项目！该错误消失。

When using MVC4, the project where your custom attribute resides must contain a reference to the System.Web.Http.Common library. I added it to my project using NuGet and hey presto! the error goes away.

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