asp.net-mvc-3 - 异步 Controller 输出缓存

Question

实现 asynchronous controller 时ASP.NET MVC 中的 action，如果我想输出缓存 ActionResult，我应该把 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
        });
    }
}

起初，我假设它会继续 NewsCompleted，因为这是返回 ActionResult 的方法。

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

Answer 1

OutputCache 参数用于 void NewsAsync 方法，而不是 ActionResult NewsCompleted 方法。 (通过实验确定)