ViewModel validation for a List

Question

I have the following viewmodel definition

public class AccessRequestViewModel
{
    public Request Request { get; private set; }
    public SelectList Buildi         


        

Answer 1

One approach could be to use a private constructor and a static method to return an instance of the object.

public class AccessRequestViewModel
{
    private AccessRequesetViewModel() { };

    public static GetAccessRequestViewModel (List persons)
    {
            return new AccessRequestViewModel()
            {
                Persons = persons,
            };
    }

    public Request Request { get; private set; }
    public SelectList Buildings { get; private set; }
    public List Persons { get; private set; }
}

By always using the factory to instantiate your ViewModel, you can ensure that there will always be a person.

This probably isn't ideal for what you want, but it would likely work.