In ASP.NET Core its very easy to access your memory cache from a controller
In your startup you add:
public void ConfigureServices(IServiceCollection services)
{
services.AddMemoryCache();
}
and then from your controller
[Route("api/[controller]")]
public class MyExampleController : Controller
{
private IMemoryCache _cache;
public MyExampleController(IMemoryCache memoryCache)
{
_cache = memoryCache;
}
[HttpGet("{id}", Name = "DoStuff")]
public string Get(string id)
{
var cacheEntryOptions = new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromHours(1));
_cache.Set("key", "value", cacheEntryOptions);
}
}
But, how can I access that same memory cache outside of the controller. eg. I have a scheduled task that gets initiated by HangFire, How do I access the memorycache from within my code that starts via the HangFire scheduled task?
public class ScheduledStuff
{
public void RunScheduledTasks()
{
//want to access the same memorycache here ...
}
}
There is another very flexible and easy way to do it is using System.Runtime.Caching/MemoryCache
System.Runtime.Caching/MemoryCache:
This is pretty much the same as the old day's ASP.Net MVC's HttpRuntime.Cache
. You can use it on ASP.Net CORE without any dependency injection, in any class you want to. This is how to use it:
// First install 'System.Runtime.Caching' (NuGet package)
// Add a using
using System.Runtime.Caching;
// To get a value
var myString = MemoryCache.Default["itemCacheKey"];
// To store a value
MemoryCache.Default["itemCacheKey"] = myString;
Memory cache instance may be injected to the any component that is controlled by DI container; this means that you need configure ScheduledStuff
instance in the ConfigureServices
method:
public void ConfigureServices(IServiceCollection services) {
services.AddMemoryCache();
services.AddSingleton<ScheduledStuff>();
}
and declare IMemoryCache as dependency in ScheduledStuff constructor:
public class ScheduledStuff {
IMemoryCache MemCache;
public ScheduledStuff(IMemoryCache memCache) {
MemCache = memCache;
}
}
I am bit late here, but just wanted to add a point to save someone's time. You can access IMemoryCache through HttpContext anywhere in application
var cache = HttpContext.RequestServices.GetService<IMemoryCache>();
Please make sure to add MemeoryCache in Startup
services.AddMemoryCache();
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With