Web API ActionFilter修改返回值 [英] Web API ActionFilter modify returned value

问题描述

我有一个Web API应用程序，我需要通过ActionFilter的OnActionExecuted方法获取某些API端点的返回值

I have a Web API application that I need to get ahold of the return value of some of the API endpoints via an ActionFilter's OnActionExecuted method

我正在使用自定义属性来标识具有需要修改的数据的端点，但是我似乎无法从HttpActionExecutedContext中找到实际的结果对象.

I'm using a custom attribute to identify the endpoints that have data that I need to modify, but I can't seem to find the actual result object from within the HttpActionExecutedContext.

感谢您的帮助！

推荐答案

您可以通过 Response.Content 属性获取返回值.如果您的操作返回了一个对象，则可以将其强制转换为 ObjectContent ，从那里您可以获取返回值的实际实例:

You can get the returned value through the Response.Content property. If your action has returned an object you can cast it to ObjectContent from where you can get the actual instance of the returned value:

public class MyFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(HttpActionExecutedContext context)
    {
        var objectContent = context.Response.Content as ObjectContent;
        if (objectContent != null)
        {
            var type = objectContent.ObjectType; //type of the returned object
            var value = objectContent.Value; //holding the returned value
        }
    }
}

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