How to use Tag with [OutputCache] on Controllers instead of Minimal API's

Question

We can use Tag like that with Minimal API's .CacheOutput(x=x.Tag("people")); So that we can use IOutputCacheStore.EvictByTag("people");.

But when it comes to controllers, we have to use [CacheOutput] attribute which does not have 'Tag'. There is no such usage like [CacheOutput(Tag="people)] so that I can not use EvictByTag(). I don't want to migrate all my controllers to minimal API's. Is there a way to use Tag with controllers?

Answer 1

CacheOutput builds cache policy which is applied to particular mapped endpoint. You can declare policy when adding services for output cache and pass policy name to the attribute:

builder.Services.AddOutputCache(options =>
    options.AddPolicy("PeopleTagPolicy", policyBuilder => policyBuilder.Tag("people")));

[OutputCache(PolicyName = "PeopleTagPolicy")]
public class PeopleController : ControllerBase
{

}

Answer 2

Try to use HttpContext.Features

HttpContext.Features.Get<IOutputCacheFeature>()?.Context.Tags.Add("you tag");

Answer 3

This was added in .NET 8, so you now can do:

[OutputCache(Tags = ["people"])]