Aspose::Cells::Style::GetInvariantCustom method. Gets the culture-independent pattern string for number format. If no number format hAs been set for this object, null will be returned. If number format is builtin, the pattern string corresponding to the builtin number will be returned in C++....Aspose::Cells::Style::GetInvariantCustom method. Gets the culture-independent pattern string for number format. If no number format has been set for this object, null will be returned. If number format is builtin, the pattern string corresponding to the builtin number will be returned in C++.