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.Net Core MemoryCache PostEvictionCallback not working properly

To add onto the accept answer and comments, you can force the cache to expire and evict automatically by using a expiring cancellation token. int expirationMinutes = 60; var expirationTime = DateTime.Now.Add(expirationMinutes); var expirationToken = new CancellationChangeToken( new CancellationTokenSource(TimeSpan.FromMinutes(expirationMinutes + .01)).Token); var cacheEntryOptions = new MemoryCacheEntryOptions() // Pin to cache. .SetPriority(CacheItemPriority.NeverRemove) // Set the actual … Read more

Using multiple instances of MemoryCache

I recently went through this myself as well. Considering an in memory cache will be process specific (not shared across multiple instances of a website or native business app or multiple servers) there is really no benefit to having multiple MemoryCache instances except for code organizational reasons (which can be achieved in other ways). The … Read more

Locking pattern for proper use of .NET MemoryCache

This is my 2nd iteration of the code. Because MemoryCache is thread safe you don’t need to lock on the initial read, you can just read and if the cache returns null then do the lock check to see if you need to create the string. It greatly simplifies the code. const string CacheKey = … Read more

C volatile variables and Cache Memory

Firmware developer here. This is a standard problem in embedded programming, and one that trips up many (even very experienced) developers. My assumption is that you are attempting to access a hardware register, and that register value can change over time (be it interrupt status, timer, GPIO indications, etc.). The volatile keyword is only part … Read more

How can I use Dependency Injection in a .Net Core ActionFilterAttribute?

As per the documentation, you have a few options here: If your filters have dependencies that you need to access from DI, there are several supported approaches. You can apply your filter to a class or action method using one of the following: ServiceFilterAttribute TypeFilterAttribute IFilterFactory implemented on your attribute ServiceFilter or TypeFilter attributes If … Read more

MemoryCache does not obey memory limits in configuration

Wow, so I just spent entirely too much time digging around in the CLR with reflector, but I think I finally have a good handle on what’s going on here. The settings are being read in correctly, but there seems to be a deep-seated problem in the CLR itself that looks like it will render … Read more

MemoryCache Empty : Returns null after being set

So, here’s some news. We looked into this and YES, this is a bug in .NET 4. The good news is that it was fixed in .NET 4.5, so if you can, update your installation to .NET 4.5 and you’re solid. The other good news it that this fix has been back-ported to .NET 4 … Read more

How to clear MemoryCache?

Dispose the existing MemoryCache and create a new MemoryCache object.