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Rick Anderson 2019-08-14 19:28:35 -04:00 committed by GitHub
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aspnetcore/performance/caching/memory.md
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@ -4,7 +4,7 @@ author: rick-anderson
description: Learn how to cache data in memory in ASP.NET Core.
ms.author: riande
ms.custom: mvc
ms.date: 04/11/2019
ms.date: 8/11/2019
uid: performance/caching/memory
---
# Cache in-memory in ASP.NET Core
@ -51,7 +51,11 @@ Use `System.Runtime.Caching`/`MemoryCache` as a compatibility bridge when portin
## Using IMemoryCache
In-memory caching is a *service* that's referenced from your app using [Dependency Injection](../../fundamentals/dependency-injection.md). Call `AddMemoryCache` in `ConfigureServices`:
> [!WARNING]
> Using a *shared* memory cache from [Dependency Injection](xref:fundamentals/dependency-injection) and calling `SetSize`, `Size`, or `SizeLimit` to limit cache size can cause the app to fail. When a size limit is set on a cache, all entries must specify a size when being added. This can lead to issues since developers may not have full control on what uses the shared cache. For example, Entity Framework Core uses the shared cache and does not specify a size. If an app sets a cache size limit and uses EF Core, the app throws an `InvalidOperationException`.
> When using `SetSize`, `Size`, or `SizeLimit` to limit cache, create a cache singleton for caching. For more information and an example, see [Use SetSize, Size, and SizeLimit to limit cache size](#use-setsize-size-and-sizelimit-to-limit-cache-size).
In-memory caching is a *service* that's referenced from your app using [Dependency Injection](xref:fundamentals/dependency-injection). Call `AddMemoryCache` in `ConfigureServices`:
[!code-csharp[](memory/sample/WebCache/Startup.cs?highlight=9)]