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.
Tag: dependency-injection
5 posts
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.
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.
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.
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.