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Tag: dependency-injection

6 posts

2026-05-31 csharp dotnet dotnet-11

How to use scoped services inside a BackgroundService in ASP.NET Core 11

A BackgroundService is a singleton, so it cannot inject a scoped service like a DbContext directly. Take IServiceScopeFactory, open one scope per unit of work with CreateAsyncScope, resolve inside it, and dispose it when the work is done.

2026-05-30 migration mediatr dependency-injection

Migrate from MediatR to plain dependency injection in .NET 11

A step-by-step checklist to remove MediatR 12-14 and replace IRequest handlers, ISender, pipeline behaviors, and INotification with plain service classes and constructor injection.

2026-05-23 comparison mediatr dependency-injection

MediatR vs plain service classes in 2026: should the license change move you?

For new code, plain service classes are the better default. MediatR's July 2025 license change matters only if you sit above the $5M Community threshold or refuse the RPL-1.5 copyleft. Keep MediatR when pipeline behaviors are load-bearing.

2026-05-10 errors csharp dotnet

Fix: Cannot consume scoped service 'X' from singleton 'Y'

ASP.NET Core's scope validation throws this when a singleton would capture a scoped dependency for the rest of the process. Make the consumer scoped, or take IServiceScopeFactory and create a scope on demand.

2026-05-10 errors csharp dotnet

Fix: Unable to resolve service for type 'X' while attempting to activate 'Y'

ASP.NET Core throws this when a constructor asks for a type that was never registered, was registered on the wrong container, or was added after the host was built. Three concrete fixes cover almost every case.

2026-04-23 dotnet-11 ef-core-11 testing

EF Core 11 Preview 3 Adds RemoveDbContext for Clean Test Provider Swaps

EF Core 11 Preview 3 introduces RemoveDbContext, RemoveExtension, and a parameterless AddPooledDbContextFactory overload, removing the boilerplate around swapping providers in tests and centralizing pooled factory configuration.