Asp.NET MVC - Validate a Model Outside of the Controller

Question

I am building an ASP.NET MVC project and going for the following Architecture:

• A Core project that has models, validation, dto, logic, etc.
<

Answer 1

I consider your approach to be good. Mapping one set of models to another could bring some bugs.

The code you are looking for is:

using System.ComponentModel.DataAnnotations;

var context = new ValidationContext(model, serviceProvider: null, items: null);
var results = new List();
var isValid = Validator.TryValidateObject(model, context, results);
if (!isValid)
    throw new Exception("Model is not valid because " + string.Join(", ", results.Select( s => s.ErrorMessage).ToArray()));

For details see http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.validationcontext.aspx or http://odetocode.com/blogs/scott/archive/2011/06/29/manual-validation-with-data-annotations.aspx