System.Xml.Serialization.TypeScope.IsOptionalValue C# (CSharp) Method

        internal static bool IsOptionalValue(Type type)
        {
            if (type.GetTypeInfo().IsGenericType)
            {
                if (type.GetGenericTypeDefinition() == typeof(Nullable<>).GetGenericTypeDefinition())
                    return true;
            }
            return false;
        }