asp.net-mvc-3 - 异步控制器输出缓存

Question

在 ASP.NET MVC 中实现异步控制器操作时，如果我想输出缓存，我应该将属性放在ActionResult哪个方法上？OutputCache

public class PortalController : AsyncController {
    /// HERE...?
    [OutputCache(Duration = 60 * 30 /* 30min */, VaryByParam = "city")]
    public void NewsAsync(string city) {

        AsyncManager.OutstandingOperations.Increment();
        NewsService newsService = new NewsService();
        newsService.GetHeadlinesCompleted += (sender, e) =>
        {
            AsyncManager.Parameters["headlines"] = e.Value;
            AsyncManager.OutstandingOperations.Decrement();
        };
        newsService.GetHeadlinesAsync(city);
    }

    /// ...OR HERE?
    [OutputCache(Duration = 60 * 30 /* 30min */, VaryByParam = "city")]
    public ActionResult NewsCompleted(string[] headlines) {
        return View("News", new ViewStringModel
        {
            NewsHeadlines = headlines
        });
    }
}

起初，我认为它会继续NewsCompleted，因为那是返回一个ActionResult.

然后我意识到它NewsAsync与 相关联VaryByParam，因此将属性放在该方法上可能更有意义。

Answer 1

OutputCache参数在方法上，而void NewsAsync不是ActionResult NewsCompleted方法上。（由实验确定）