How do I use VaryByParam with multiple parameters?

In ASP.NET MVC2 I use OutputCache and the VaryByParam attribute. I got it working fine with a single parameter, but what is the correct syntax when I have several parameters on the method?

[OutputCache(Duration=30, VaryByParam = "customerId"]
public ActionResult Index(int customerId)
//I've got this one under control, since it only has one parameter

[OutputCache(Duration=30, VaryByParam = "customerId"]
public ActionResult Index(int customerId, int languageId)
//What is the correct syntax for VaryByParam now that I have a second parameter?

How do I get it to cache the pages using both parameters? Do I enter add the attribute twice? Or write “customerId, languageId” as the value??

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You can use * for all parameters or a semi-colon separated list (VaryByParam = “customerId;languageId”).

You can also use none if you didn’t want it to cache different versions….

Here’s a nice write up specifically for MVC.