How to use OutputCache for a specific argument only?

Question

I have this example of OutputCache. My problem is that I want the page to be cached only if the [id] equals to NULL. In all other cases I don't want to have cache at all.

MyController:

[OutputCache(Duration = int.MaxValue, VaryByParam = "id")] public ActionResult Details(int id) {}

RouteConfig:

routes.MapRoute( name: "edit", url: "edit/{id}", defaults: new { controller = "asd", action = "Details", id = UrlParameter.Optional } );

Brad Christie · Accepted Answer · 2013-09-27 15:36:24Z

1

You can specify (and implement) the VaryByCustom parameter of OutputCacheAttribute:

MyController.cs

[OutputCache(Duration = int.MaxValue, VaryByCustom = "idIsNull")] public ActionResult Details(int id) { }

Global.asax.cs

public override string GetVaryByCustomString(HttpContext context, string arg) { if (arg.ToLower() == "idisnull") { return string.IsNullOrWhiteSpace(Request.QueryString["id"]) ? string.Empty // unique key means it won't have a consistent value to use // as a cache lookup : ((new DateTime(1970, 1, 1) - DateTime.Now).TotalMilliseconds).ToString(); } }

answered Sep 27, 2013 at 15:36

Brad Christie

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6 Comments

user1615362 Over a year ago

Thanks, but the [id] is not a query string. See edit for routing details

Brad Christie Over a year ago

@user1615362: I don't see it defined in the route url, so what's the problem?

user1615362 Over a year ago

This IsNullOrWhiteSpace(Request.QueryString["id"]) will always be true.

user1615362 Over a year ago

There are no QueryStiring params at all, I am using restful URLs and the [id] is a url segment.

Brad Christie Over a year ago

@user1615362: once again....not according to your route. I don't see {id} anywhere in that route, therefore it's either a POST value (in which case Request.Form should be used) or a GET variable (stick with Request.QueryString).

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