AsyncController OutputCache

Question

当在ASP.NET MVC中实现asynchronous controller操作时，如果我想输出缓存ActionResult，我应该将OutputCache属性放在哪个方法上？

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
        });
    }
}

一开始，我假设它会运行在NewsCompleted上，因为它是返回ActionResult的方法。

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

Answer 1

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