public void OnActionExecuting(ActionExecutingContext context)
{
ArgumentNullException.ThrowIfNull(context);
// If there are more filters which can override the values written by this filter,
// then skip execution of this filter.
var effectivePolicy = context.FindEffectivePolicy <IOutputCacheFilter>();
if (effectivePolicy != null && effectivePolicy != this)
{
Log.NotMostEffectiveFilter(_logger, GetType(), effectivePolicy.GetType(), typeof(IOutputCacheFilter));
return;
}
var outputCachingFeature = context.HttpContext.Features.Get <IOutputCacheFeature>();
if (outputCachingFeature == null)
{
throw new InvalidOperationException(
Resources.FormatOutputCacheAttribute_Requires_OutputCachingMiddleware(nameof(OutputCacheAttribute)));
}
}
