在Asp.net MVC 4中使用OutputCacheAttribute的条件缓存 [英] Conditional Cache using OutputCacheAttribute in Asp.net MVC 4
问题描述
我正在尝试为我的动作结果实现输出缓存.
I am trying to implement Output caching for my action results.
在我根据某些业务规则执行的操作中,将返回响应.在我的回复中,我发送了错误代码. 如果有任何错误,我不想缓存响应.
In my actions depending upon some business rules response is returned. In my response I send error code. I do not want to cache the response if there is any error.
按照操作结果
class Response
{
public int ErrorCode { get; set; }
public string Message { get; set; }
}
[OutputCache(CacheProfile = "Test")]
public ActionResult Sample()
{
Response response = new Response();
return new JsonResult { Data = response, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
}
仅当ErrorCode == 0时,我才希望缓存结果.
I want cache the Result only if ErrorCode==0.
我尝试覆盖OutputCache,但无法正常工作
I tried overriding OutputCache, but it is not working
public class CustomOutputCacheAttribute : OutputCacheAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
if (filterContext.Result is JsonResult)
{
var result = (JsonResult)filterContext.Result;
BaseReponse response = result.Data as BaseReponse;
if (!response.IsSuccess)
{
filterContext.HttpContext.Response.Cache.SetNoStore();
}
base.OnActionExecuted(filterContext);
}
}
}
还有其他方法或方法来实现这一目标.
Is there any other way or approach to achieve this.
谢谢
推荐答案
您可以创建自己的自定义属性,该属性将根据结果错误代码忽略[OutputCache]
,如下所示:
You can create your own custom attribute that will ignore [OutputCache]
based on the result error code, something like this:
[OutputCache(Duration=60, VaryByParam="none")]
[OutputCacheValidation]
public ActionResult Sample()
{
var r = new Response();
r.ErrorCode = 0;
return Json(r, JsonRequestBehavior.AllowGet);
}
public class OutputCacheValidationAttribute : ActionFilterAttribute
{
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
base.OnResultExecuting(filterContext);
filterContext.HttpContext.Response.Cache.AddValidationCallback(ValidatioCallback, filterContext.Result);
}
private static void ValidatioCallback(HttpContext context, object data, ref HttpValidationStatus validationStatus)
{
var jsonResult = data as JsonResult;
if (jsonResult == null) return;
var response = jsonResult.Data as Response;
if (response == null) return;
if (response.ErrorCode != 0)
{
//ignore [OutputCache] for this request
validationStatus = HttpValidationStatus.IgnoreThisRequest;
context.Response.Cache.SetNoServerCaching();
context.Response.Cache.SetNoStore();
}
}
}
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