FastEndpoints VS MediatR

Bonus Time! In addition to the Microsoft-supported methods above, many community frameworks exist for building APIs with .NET. FastEndpoints is an option I found recently that seems very promising. With performance benchmarks that put them on par with Minimal API, they are firmly ahead of Controller-based APIs.

Have you had a look at FastEndpoints yet? Any thoughts?

And yet, all Microsoft's demos for the upcoming changes for Blazor in .NET 8 (like SSR) has been a public facing recipe site (e.g. https://www.youtube.com/watch?v=QD2-DwuOfKM). I'd say this is a very similar use case as the Microsoft Store.

I love .NET and ASP.NET Core, but I use it purely for backend. And even there, I use 3rd party libraries like Fast Endpoints (https://fast-endpoints.com/). Microsoft keeps bringing in new technologies and effectively abandoning the ones that fall out of favour (look at the progression from MVC -> Razor Pages -> Blazor). I do not blame the Microsoft Store team for not trusting the .NET team to not simply abandon Blazor as well somewhere down the line and instead opt for other technologies for the front-end.

I also find a very similar framework in .NET "Fast Endpoints"

I gave it a go and I was impressed how easy and fast it was to set it all up. Since I'm not a big fan of REPR pattern almost all my projects are using CQRS pattern with a help of MediatR ](https://github.com/jbogard/MediatR) I immediately started going over something similar that Fast Endpoints offer which is a command bus.

Ive personally been using FastEndpoints which is a community built thing on top of minimal apis - https://fast-endpoints.com/

I've just started to use a similar thing, and it's so much better than controllers - https://fast-endpoints.com/

Sort of minimal but check out FastEndpoint. https://fast-endpoints.com/

You probably noticed that .SetName() returns a Either. You may have come across Unit in libraries like MediatR or Language-Ext. It's a simple construct representing a type with only one possible value. We use it as a placeholder for operations that do not return a value but may return another state. In our example, .SetName() is a Command that does not return a value but may fail. Therefore, the monad Either carries two possible states: Right (without value) or Left (with an Error).

The widely used MediatR library[0] could be used to do that as well, just FYI.

[0]: https://github.com/jbogard/MediatR

Hope this GH issue shed some light on why injecting handler inside another handler is not good https://github.com/jbogard/MediatR/issues/400

From: https://github.com/jbogard/MediatR

I gave it a go and I was impressed how easy and fast it was to set it all up. Since I'm not a big fan of REPR pattern almost all my projects are using CQRS pattern with a help of MediatR ](https://github.com/jbogard/MediatR) I immediately started going over something similar that Fast Endpoints offer which is a command bus.

I'd use a dedicated event bus based on Reactive Extensions or MediatR to publish domain events from your domain services. This probably doesn't solve all your ViewModel update problems as is, maybe you need to revise the granularity (maybe you can have smaller ViewModels that refresh single property that exposes the Model) and lifespan (sometimes you can create a ViewModel, make it perform it's task and then discard it completely) of your ViewModels.

If you're finding yourself in a situation where you need to turn this behavior into a pattern because there are a lot of View Models that need to execute async business logic in response to some changes, I'd go with something like MediatR or Reactive Extensions. The idea is, again, that some other, probably business-level, component listens to changes in a decoupled way (that means it doesn't subscribe directly to your View Model, but to an event bus instead). View Model publishes change events to the event bus, and business-component reacts to these events by executing the business logic.

What people really want is to design the logic of an app independently from the component hierarchy. That means you need to store state somewhere other than the components and you need to dispatch events that are not attached to the component hierarchy. Also, a one way data flow has well known benefits as described by things like CQRS, RabbitMQ, and MediatR.