public static ValidateTarget <TSet> IsProperSubsetOf <TSet, TItem>([ValidatedNotNull] this ValidateTarget <TSet> target, IEnumerable <TItem> valueToCompare, Func <string> getErrorMessage = null)
where TSet : ISet <TItem>
{
if (target.Value != null)
{
if (!target.Value.IsProperSubsetOf(valueToCompare))
{
ExceptionFactory.ThrowException(target.Traits.GenericFailureExceptionType, getErrorMessage != null ? getErrorMessage.Invoke() : ErrorMessageFactory.ShouldBeProperSubsetOf(target));
}
}
return(target);
}
