[SOLVED] .net 7 How to set outputcache expiration from inside the controller?

.net 7 How to set outputcache expiration from inside the controller?

I need to set the Cache Duration within the controller or set something that can be used by a cache policy to set the ResponseExpirationTimeSpan. (How long the data can be cached varies based on the situation)

I am not using minimal API.

I tried setting the expiry value via httpContext and picking it up in a policy. eg. HttpContext.Items["cacheExpire"] = 2;

but

IOutputCachePolicy.CacheRequestAsync & IOutputCachePolicy.ServeFromCacheAsync gets called before the controller method and setting it in IOutputCachePolicy.ServeResponseAsync does not take effect.

What is the correct solution for this scenario?

Solution

To set the cache duration in a controller, get the IOutputCacheFeature and set the time on it.

example:

public class TestController: ControllerBase
{
  [HttpGet]
  public ActionResult<string> Get()
  {
     var cache = HttpContext.Features.Get<IOutputCacheFeature>() ?? throw new InvalidOperationException("Output cache feature not found");
     cache.Context.ResponseExpirationTimeSpan = TimeSpan.FromSeconds(20);
     return "Test Controller";
  }
}