Question

I am using the custom RequiredIf attribute created by Simon Ince in my MVC app.

I have a viewmodel which is passed to the view like this:

public class HistoryViewModel
{
    public Contact ContactModel { get; set; }
    public Account AccountModel { get; set; }
    public Person PersonModel { get; set; }
 }

I have a bunch of models with all the props in them (i.e. contact.cs, account.cs, person.cs)

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public bool IsAdult { get; set; }        
    [RequiredIf("IsAdult", "Yes", Errormessage="Please leave a comment")]
    public string Comments { get; set; }
 }

The RequiredIf validation does not seem to be working when passed through the viewmodel. It works fine if I move the properties into the viewmodel directly. All other[Required]` attributes work from the model, through the viewmodel.

So do I need to move all the properties into the viewmodel, that need the RequiredIf on them? Or is there another way around this?

Answer 1

Have you tried MVC FoolProof validation? It has support for RequiredIf (and a fair few others) with Client Side support. It can sometimes be a bit buggy but latest version isn’t to bad.

Works in same way as the above (which I tried before I switched to FoolProof)

   public bool Married { get; set; }

    [RequiredIfTrue("Married")]
    public string MaidenName { get; set; }