public override bool Handle(object input, Queue<string> tokens)
{
var elementType = _property.PropertyType.GetGenericArguments().First();
var list = typeof(List<>).CloseAndBuildAs<IList>(elementType);
var wasHandled = false;
var flag = "";
if (tokens.NextIsFlagFor(_property))
{
flag = tokens.Dequeue();
while (tokens.Count > 0 && !tokens.NextIsFlag())
{
var value = _converter.FromString(tokens.Dequeue(), elementType);
list.Add(value);
wasHandled = true;
}
if(!wasHandled)
{
throw new InvalidUsageException("No values specified for flag {0}.".ToFormat(flag));
}
_property.SetValue(input, list, null);
}
return wasHandled;
}