Add a ValidationAttribute to Validate Model Property Against SmartEnum Names

[sdepouw]

In this scenario, an incoming data model may contain a SmartEnum name. Ideally, one could easily validate it against a particular SmartEnum to make sure the value is among the enum's names.

public sealed class Vehicle : SmartEnum<Vehicle>
{
    public static readonly Vehicle Car = new Vehicle(nameof(Car), 1);
    public static readonly Vehicle Boat = new Vehicle(nameof(Boat), 2);
    public static readonly Vehicle Plane = new Vehicle(nameof(Plane), 3);

    private VehcileTypeEnum(string name, int value) : base(name, value) { }
}

public class ExampleModel
{
    [Required]
    [SmartEnumName(typeof(Vehicle))]
    public string VehicleName { get; set; } // Can only be "Car", "Boat", or "Plane"
}