在MVC 4异步行为过滤器 [英] Async action filter in MVC 4

问题描述

我有一个动作的过滤器，在某些特定的条件下使用时，必须执行web服务调用，以确保当前状态是有效的。这最初似乎像异步/的await的理想人选，但我已经遇到了障碍：

I have an action filter that when used in certain specific conditions has to perform a web service call to ensure that the current state is valid. This initially seemed like an ideal candidate for async/await, but I have encountered a snag:

假设一个请求：/测试/ FilteredAction

Assume a request to: /Test/FilteredAction

• MyCustomActionFilter开始执行
  
  
  
  • 第一个伺机达到声明
  
  

  传统我期望的动作过滤器来恢复执行，然后完成控制器动作开始执行之前，但是这不会发生。

  Traditionally I would expect the action filter to resume executing and then complete before the controller action starts executing, but this does not happen.

  现在我想这是因为我使用的：

  Now I assume this is because I am using:

  public class MyCustomActionFilter : ActionFilterAttribute 
  {
      public override **async** void OnActionExecuting(FilterContext context) 
      {
          var foo = await WebServiceCall();
      }
  }
  

  所以我想我的问题是：有没有内置MVC 4异步感知行动过滤器类，或者我应该只是在电话阻断这里

  So I think my question is: Is there an async-aware action filter class built into MVC 4, or should I just block on the calls in here?

  推荐答案

  MVC没有一个异步兼容的行为过滤器（但<一href=\"http://msdn.microsoft.com/en-us/library/system.web.http.filters.iactionfilter%28v=vs.108%29.aspx\">WebAPI确实有一个）。

  MVC does not have an async-compatible action filter (but WebAPI does have one).

  现在，我推荐你使用 OnActionExecuting 阻塞调用。希望MVC将在未来的美好故事。

  For now, I recommend you use blocking calls in OnActionExecuting. Hopefully MVC will have a better story in the future.

  更新：：您可以投票这里的MVC团队添加异步过滤器。

  Update: You can vote here for the MVC team to add async filters.

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