MediatR Validation and the Chain of Responsibility Pattern

MediatR, Validation, and the Chain of Responsibility Pattern
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Hey everyone, I'm Steve Smith aka ardalis, of NimblePros!
In this video we take a look at how to pull validation out of our Web/UI layer and move it closer to our business/domain layer. We're using CQRS and MediatR with Clean Architecture to implement the Chain of Responsibility Pattern. The actual validation is using FluentValidation.
Links
github.com/ardalis/CleanArchi...
github.com/jbogard/MediatR
github.com/FluentValidation/F...
github.com/ardalis/Result
• When To Validate and W... (When to Validate and When to Throw Exceptions?)
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#dotnet #deviq #ardalis #nimblepros #visualstudio #csharp #designpatterns #nuget #cleancode #validation #fluentvalidation #result #cleanarchitecture #mediatr #chainofresponsibility

[@joshuawilliams8230]

Your SOLID course on Pluralsight is so good! I also love your DDD course with Julie Lerman

[@fizmhd]

thanks for making videos, have been using your libraries, its great to see that you are on UA-cam.

[@Ardalis]

Glad you like them!

[@pavelernestonavarroguerrer7871]

Thanks a lot! An excelent and practical use of the behaviors!

[@Ardalis]

Glad you enjoyed it!

[@coderider3022]

Yip, definitely use it with a fluent result return type (validation error mapped to reason) and I return this as a failure instead of calling next.

[@Ardalis]

Agreed.

[@rezaabolhasanzadeh6845]

tnx Steve . I love your content and way of teaching . I'm surprised your channel has few subs . please be more active on youtube . your knowledge is really usefull

[@Ardalis]

Thanks! Aiming for weekly videos; we’ll see how it goes.

[@Ardalis]

Thanks! Aiming for weekly videos; we’ll see how it goes.

[@mesutdemirci7933]

Thanks a lot!

[@Ardalis]

You're welcome!

[@herewegotoday]

I currently use the template method pattern for ensuring multiple features always create an audit log for the task. Would the chain of responsibility pattern be better suited for such a thing? It certainly seems more elegant.

[@Ardalis]

It would almost certainly require less code and would eliminate inheritance, which usually simplifies designs. I'd say it's worth trying it and then you can assess which you prefer.