Question

So I am trying to do get the key for a model object in the controller so that I can add a AddModelError to it.

In my view I use

@Html.ValidationMessageFor(model => model.Email)

Whats the equivalent code to get the Key name to add in the controller so it attaches to this ValidationMessage.

Answer 1

ModelState.AddModelError("Email", "the email is invalid");

But usually that’s not something you should be doing manually in your controller but you should be using a validator. For example you could decorate this Email property with some validation data annotation attribute or if you are like me use FluentValidation.NET => this way you shouldn’t be asking yourself questions about keys but focus on the actual validation logic.