Question 1

How to add validation to MediatR requests?

Accepted Answer

Use pipeline behaviors to intercept requests before handlers run. For example, create a behavior that checks FluentValidation rules, allowing centralized validation logic without cluttering handlers.

Question 2

MediatR vs NServiceBus for in-process messaging?

Accepted Answer

MediatR is lightweight and dependency-free, ideal for simple decoupling within a single process. NServiceBus is heavier with more features like sagas and distributed messaging, but adds complexity and external dependencies.

Question 3

Can MediatR be used with Blazor?

Accepted Answer

Yes, MediatR supports Blazor via the MediatR.Contracts package for separating contracts, as mentioned in the README. Handlers can be registered in dependency injection for client-side or server-side Blazor.

Question 4

How to log all MediatR requests and responses?

Accepted Answer

Implement a pipeline behavior that logs before and after handling. Register it using AddBehavior in the service configuration to apply logging across all requests without modifying individual handlers.

Question 5

Does MediatR work with .NET Core dependency injection?

Accepted Answer

Yes, it integrates directly with Microsoft.Extensions.DependencyInjection. Use the AddMediatR extension method to register handlers and mediators from assemblies, as shown in the README examples.

Question 6

MediatR performance impact in high-load applications?

Accepted Answer

MediatR adds overhead due to dispatching and reflection, which might affect performance in latency-sensitive apps. Profile your use case; for critical paths, consider caching or minimizing pipeline depth.

MediatR

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