ASP.Net Core and model validation

Question

Suppose I have a model which I need to validate. I can add some validate attributes to the properties I want to validate. And it works pretty fine. But at some point I want to validate this model depending on other models (I will need t query db). And here there are some options.

• create a special validate attribute which will lack dependency injection
• delegate this validation to some business layer (manager) and in controller

_

if (Model.IsValid) {
    if(!await Manager.Create(myModel)) {
        Model.CopyErrors(Manager.Errors); // Extension method for Model
    }
}

So what is the correct way of handling such a situation?

P.S. I am using asp.net core and entity framework core

Answer 1

What you need is Fluent Validation