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I encountered the above error message after applying the OutputCache attribute on ActionResult methods with no input parameters – why would I use VaryByParams in this case? Is this a bug in ASP.Net MVC or is there a way of using OutputCache without setting this property?
My big question is, if I have to use VaryByParams, what should I enter for a value if I have no parameters to cache against?
I never found a satisfactory answer for this – basically, you just need to add the VaryByParams property and if you don’t have any parameters set it to the magic string ‘none’.
http://msdn.microsoft.com/en-us/library/system.web.ui.outputcacheparameters.varybyparam.aspx