how to use MemoryCache Class to cache and get a list in asp.net core

Question

I can get a cached object by creating an instance of IMemoryCache class like this:

_memoryCache.Get<Users>(id);

1. How can I get a list of Users using this class?

2. How do I cache the list if it was not cached?

Answer 1

You can use the TryGetValue method that returns the cached object as an output parameter. Refer the example below:-

List<User> users;
string key = "usersCacheKey";
//TryGetValue will get the item from cache and assign it to users variable.
//It will return false if item is not found.
if(!_memoryCache.TryGetValue<List<User>>(key, out users){
  //item not found in cache. set the cache item here
  users = new List<User>();
  _memoryCache.Set<List<User>>(key, users);
}

Reference below link(s) fro more information on how to use Memory Caching in ASP.NET Core 5.0:- Cache in-memory in ASP.NET Core