我有一个ActionResult缓存.
[OutputCache(Duration = 3600,VaryByParam = "product_Id")] public ActionResult ProductPreview(Guid product_Id) { // just for testing the cache System.Threading.Thread.Sleep(4000); return PartialView("ProductPreview",_repository.CreateProductModel(product_Id)); }
很高兴的是缓存正在工作.第一次加载后,结果显示没有任何4秒的延迟.
但是,当对该产品进行某些更改时,我需要清除缓存.
我试图清除缓存做如下:
public ActionResult RemoveCache() { var url = Url.Action("ProductPreview","Common"); // also tried with parameter // var url = Url.Action("ProductPreview","Common",new { @product_Id = "productId" }); HttpResponse.RemoveOutputCacheItem(url); return RedirectToAction("Index"); }
我还尝试使用ajax和全页刷新调用RemoveCache方法,而不是它们正在工作.
我能做什么?哪里有问题?
解决方法
RemoveOutputCacheItem仅适用于路由参数,而不是查询字符串.所以你可以修改你的路线定义:
routes.MapRoute( "Default","{controller}/{action}/{product_Id}",new { controller = "Home",action = "Index" } );
现在可以使用RemoveOutputCacheItem方法:
public ActionResult RemoveCache(Guid product_Id) { var url = Url.Action("ProductPreview",new { product_Id = product_Id }); // the url must look like this: /Common/ProductPreview/eeb2fe32-db58-4fc3-87c8-b47480fbe094 // for the RemoveOutputCacheItem method to work HttpResponse.RemoveOutputCacheItem(url); return RedirectToAction("Index"); }
更新:
这是我的测试用例:
控制器:
public class HomeController : Controller { public ActionResult Index() { return View(); } [OutputCache(Duration = 3600,VaryByParam = "product_id")] public ActionResult ProductPreview(Guid product_id) { var model = string.Format( "{0} - {1}",product_id,DateTime.Now.ToLongTimeString() ) return PartialView("_Foo",model); } public ActionResult RemoveCache(Guid product_id) { var url = Url.Action( "ProductPreview","Home",new { product_id = product_id } ); HttpResponse.RemoveOutputCacheItem(url); return RedirectToAction("Index"); } }
查看(〜/ Views / Home / Index.cshtml):
@{ var productId = Guid.NewGuid(); } @Html.ActionLink("product 1","ProductPreview",new { product_id = Guid.NewGuid() }) <br/> @Html.ActionLink("product 2",new { product_id = productId }) <br/> @Html.ActionLink("product 3",new { product_id = Guid.NewGuid() }) <br /> @Html.ActionLink( "clear cache for the second product","RemoveCache",new { product_id = productId } )
部分视图(〜/ Views / Home / _Foo.cshtml):
@model string @Model
并在全球.asax:
public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default","{controller}/{action}/{product_id}",action = "Index",product_id = UrlParameter.Optional } ); }
更新2:
现在你已经显示了你的代码,好像你正在使用Html.RenderAction帮助器,而ProductPreview是一个子操作.子动作与普通视图不存储在相同的缓存中,HttpResponse.RemoveOutputCacheItem帮助器根本不起作用,缓存子操作.如果您仔细阅读我之前的示例,您将看到我使用标准链接进行ProductPreview操作.
目前您正在尝试实现的是ASP.NET MVC 3中无法实现的.如果要使用甜甜圈输出缓存,我建议您使用following article.希望此功能将添加到ASP.NET MVC 4中.