ASP.NET MVC 3 Data Annotation: Add validation dynamically

Question

I\'m new with data annotation. I\'d like to know if it possible (and how) to add some validation dynamically. It is very extensive to explain why, but I\'ve a ViewModel that rec

Answer 1

I think that the simplest way of doing what I wanted is implementing IValidatableObject:

public class Product : IValidatableObject
{
    public int Prop1 { get; set; }
    public int Prop2 { get; set; }

    public IEnumerable Validate(ValidationContext validationContext)
    {
        if (Prop1 < Prop2)
            yield return new ValidationResult("Property 1 can't be less than Property 2");
    }
}

See also: Class-Level Model Validation with ... ASP.NET MVC 3