OutputCache / ResponseCache VaryByParam

Question

ResponseCache is somewhat a replacement for OutputCache; however, I would like to do server side caching as well as per parameter input.

According to some answers here and here, I should be using IMemoryCache or IDistributedCache to do this. I'm particularly interested in caching on controllers where the parameter is different, previously done in asp.net 4 with OutputCache and VaryByParam like so:

[OutputCache(CacheProfile = "Medium", VaryByParam = "id", Location = OutputCacheLocation.Server)]
public ActionResult Index(long id) 
{ 
    ///...
}

How would I go about replicating this in asp.net core?

Answer 1

If you want to change the cache by all request query parameters in all requests in the controller:

[ResponseCache(Duration = 20, VaryByQueryKeys = new[] { "*" })]
public class ActiveSectionController : ControllerBase
{
   //...
}

Answer 2

First be sure you are using ASP.NET Core 1.1 or higher.

Then use a code similar to this on your controller method:

[ResponseCache(Duration = 300, VaryByQueryKeys = new string[] { "date_ref" } )]
public IActionResult Quality(DateTime date_ref)

Source: https://docs.microsoft.com/en-us/aspnet/core/performance/caching/middleware