Why getting multiple instances of IMemoryCache in

Question

I have what I believe is a standard usage of IMemoryCache in my ASP.NET Core application.

In startup.cs I have:

services.AddMemoryCache();

In my controllers I have:

private IMemoryCache memoryCache;
public RoleService(IMemoryCache memoryCache)
{
    this.memoryCache = memoryCache;
}

Yet when I go through debug, I end up with multiple memory caches with different items in each one. I thought memory cache would be a singleton?

Updated with code sample:

public List<FunctionRole> GetFunctionRoles()
{
    var cacheKey = "RolesList";
    var functionRoles = this.memoryCache.Get(cacheKey) as List<FunctionRole>;
    if (functionRoles == null)
    {
         functionRoles = this.functionRoleDAL.ListData(orgId);
         this.memoryCache.Set(cacheKey, functionRoles, new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromDays(1)));
    }
}

If I run two clients in two different browsers, when I hit the second line I can see this.memoryCache contains different entries.

Answer 1

I did NOT find a reason for this. However, after further reading I swapped from IMemoryCache to IDistributedCache using the in-memory distributed cache and the problem is no longer occurring. I figured going this route would allow me to easily update to a redis server if I needed multiple servers later on.