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#Icaching providers .net how to#

If SizeLimit is set, then every new entry must specify size.

#Icaching providers .net how to#

There’s no way for the cache to know how to measure the size of entries we might be putting in the cache. The Memor圜acheOptions class provides a property, SizeLimit, which sets a maximum size for the cache. The ASP.NET Core runtime doesn’t limit cache growth, so you need to control growth from within the app itself. _ = await cache.GetOrCreateAsync("key1", entry =>Įntry.SetSlidingExpiration(TimeSpan.FromSeconds(5)) Įntry.AbsoluteExpirationRelativeToNow = TimeSpan.FromSeconds(30) For example, we can set a 5-second sliding expiration with an absolute expiration to force data to refresh every 30 seconds: If you use only sliding expiration, and the item is accessed more frequently than the expiration, it may never expire, and the data could become stale. Tip: Combine a sliding expiration with an absolute expiration.

AbsoluteExpirationRelativeToNow: Expiration time, relative to the current time.

Absolute Expiration: Absolute expiration date for the cache entry.

Sliding Expiration: If a cache entry is accessed during this period, the period resets.

The following properties are available on the Memor圜acheEntryOptions API: Setting expiration times for cache entries are necessary to control cache growth. For other scenarios, it’s available in the NuGet package, and you can add it as a service:Ĭontroller constructors then request instances of IMemor圜ache via dependency injection. The IMemor圜ache service is automatically registered when using any of the boilerplate extension methods such as AddMvc and AddControllersWithView. Because of this limitation, it’s best suited for single-server deployments. It runs in-process, so it’s fast.Ī disadvantage of this single process model is that the cache data isn’t shared horizontally across scaled-out instances of the application. The simplest cache implementation in ASP.NET Core is represented by IMemor圜ache. In-memory caching uses the server memory to store cached data locally, and distributed caching distributes the cache across various servers. Where Can We Cache?ĪSP.NET Core uses two caching techniques.

Let’s explore caching in ASP.NET Core and help you decide which type of cache is best for your needs. If our application uses a cache to store that content, then the next time it’s requested, our application can simply retrieve it from memory. It’s one of the most effective ways to improve web performance.Ĭaching is most beneficial when data changes infrequently, yet the content relying on that data is used frequently.

Implementing caching means that the application doesn’t have to fetch and process the same data again and again. Relational databases are historically challenging to scale. I've noticed that HttpContextBase implements IServiceProvider.Generating content served from an ASP.NET application can be slow and expensive - particularly when there’s heavy use of database calls. I could write a CustomBaseController that uses an ICacheProvider interface that I define andĪll my controllers derive from this base class, but if there's a more elegant (ASP.NET MVCish) solution I would be glad to implement it. I am very new to the ASP.NET MVC framework and I must be missing something here. It seems that I am not the only one struggling to mock out the classes in the framework. I don't understand how the Cache property used here is an abstraction of a cache provider. In ASP.NET MVC 1.0 there's the assembly (name looks promising) that defines the HttpContextBase like this: public abstract class HttpContextBase : IServiceProvider It was also very easy to mock and unit test my controller. MonoRail to use my cache provider instead of the default one. So, all I had to do was to implement a custom cache provider that uses memcached and tell In MonoRail this task was very easy because the framework used interfaces and there is ICacheProvider that looks like this: public interface ICacheProvider : IProvider, IMRServiceEnabledĪn instance of this interface is available in every controller action. In my original application I wrote a custom cache provider (a distributed cache provider using memcached). I am migrating a MonoRail application to ASP.NET MVC 1.0.