如何使用Refection获取动作的HTTP动词属性-ASP.NET Web API [英] How do I get http verb attribute of an action using refection - ASP.NET Web API

问题描述

我有一个ASP.NET Web API项目.使用反射，如何获得装饰动作方法的Http动词(在下面的示例中为[HttpGet])属性?

I have an ASP.NET Web API project. Using reflection, how can I get the Http verb ([HttpGet] in the example below) attribute which decorates my action methods?

[HttpGet]
public ActionResult Index(int id) { ... }

假设我的控制器中具有上述操作方法.到目前为止，通过反射，我已经能够获取Index动作方法的MethodInfo对象，该对象已存储在名为methodInfo

Assume that I have the above action method in my controller. So far, by using reflection I have been able to get a MethodInfo object of the Index action method which i have stored in a variable called methodInfo

我尝试使用以下命令获取http动词，但该命令不起作用-返回null:

I tried to get the http verb using the following but it did not work - returns null:

var httpVerb = methodInfo.GetCustomAttributes(typeof (AcceptVerbsAttribute), false).Cast<AcceptVerbsAttribute>().SingleOrDefault();

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我注意到的事情:

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Something I noticed:

我上面的示例来自我正在研究的ASP.NET Web API项目.

My example above is from a ASP.NET Web API project I am working on.

[HttpGet]似乎是System.Web.Http.HttpGetAttribute

It seems that the [HttpGet] is a System.Web.Http.HttpGetAttribute

，但是在常规的ASP.NET MVC项目中，[HttpGet]是System.Web.Mvc.HttpGetAttribute

but in regular ASP.NET MVC projects the [HttpGet] is a System.Web.Mvc.HttpGetAttribute

推荐答案

var methodInfo = MethodBase.GetCurrentMethod();
var attribute = methodInfo.GetCustomAttributes(typeof(ActionMethodSelectorAttribute), true).Cast<ActionMethodSelectorAttribute>().FirstOrDefault();

你非常亲密...

区别在于，所有动词"属性都继承自" ActionMethodSelectorAttribute "，包括" AcceptVerbsAttribute "属性.

The difference is that all 'verb' attributes inherit from 'ActionMethodSelectorAttribute' including the 'AcceptVerbsAttribute' attribute.

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