How Do I Clear, Expire, or Refresh a Cached Item On an Event?

[PostAlmostAnything]

I have a feature on an old ASP.Net WebForms site for users to post comments. I am implementing LazyCache and want to serve comments from the cache, but this creates a bad user experience if they post a comment because the list of comments does not include their latest comment right away.

How do I clear the cache for comments whenever a new comment is posted? I tried disposing of the provider but that results in a runtime error saying that a disposed object cannot be accessed.

I would like to refresh the comments cache ideally by adding some code to the comment inserted event that removed the cache based on the cache key of the comments.

[alastairtree]

In your use case you could cache the comments with a key based on the id of the page on which the comments appear, such as comments-page-01. When a new comment is added to that page then you should just remove that key from the cache:

//Add the comment to page PageId

// Get the cache (better to use dependency injection)
IAppCache cache = new CachingService();

// Remove the pages comments from the cache
cache.Remove($"comments-page-{PageId}");

More info in the docs

• https://github.com/alastairtree/LazyCache/wiki/API-documentation-(v-2.x)#deletingremovingclearing-something-from-the-cache
• Or even remove everything - https://github.com/alastairtree/LazyCache/wiki/API-documentation-(v-2.x)#empty-the-entire-cache

[alastairtree]

Closing as inactive,