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aspnetcore/fundamentals/dependency-injection.md
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@ -5,7 +5,7 @@ description: Learn how ASP.NET Core implements dependency injection and how to u
monikerRange: '>= aspnetcore-2.1' monikerRange: '>= aspnetcore-2.1'
ms.author: riande ms.author: riande
ms.custom: mvc ms.custom: mvc
ms.date: 08/06/2019 ms.date: 08/14/2019
uid: fundamentals/dependency-injection uid: fundamentals/dependency-injection
--- ---
# Dependency injection in ASP.NET Core # Dependency injection in ASP.NET Core
@ -165,7 +165,7 @@ Transient lifetime services (<xref:Microsoft.Extensions.DependencyInjection.Serv
Scoped lifetime services (<xref:Microsoft.Extensions.DependencyInjection.ServiceCollectionServiceExtensions.AddScoped*>) are created once per client request (connection). Scoped lifetime services (<xref:Microsoft.Extensions.DependencyInjection.ServiceCollectionServiceExtensions.AddScoped*>) are created once per client request (connection).
> [!WARNING] > [!WARNING]
> When using a scoped service in a middleware, inject the service into the `Invoke` or `InvokeAsync` method. Don't inject via constructor injection because it forces the service to behave like a singleton. For more information, see <xref:fundamentals/middleware/index>. > When using a scoped service in a middleware, inject the service into the `Invoke` or `InvokeAsync` method. Don't inject via constructor injection because it forces the service to behave like a singleton. For more information, see <xref:fundamentals/middleware/write#per-request-middleware-dependencies>.
### Singleton ### Singleton