System.Xml.Serialization.XmlReflectionImporter.CheckChoiceIdentifierType C# (CSharp) Method

        private Type CheckChoiceIdentifierType(Type type, bool isArrayLike, string identifierName, string memberName)
        {
            if (type.IsArray)
            {
                if (!isArrayLike)
                {
                    // Inconsistent type of the choice identifier '{0}'.  Please use {1}.
                    throw new InvalidOperationException(SR.Format(SR.XmlChoiceIdentifierType, identifierName, memberName, type.GetElementType().FullName));
                }
                type = type.GetElementType();
            }
            else if (isArrayLike)
            {
                // Inconsistent type of the choice identifier '{0}'.  Please use {1}.
                throw new InvalidOperationException(SR.Format(SR.XmlChoiceIdentifierArrayType, identifierName, memberName, type.FullName));
            }

            if (!type.GetTypeInfo().IsEnum)
            {
                // Choice identifier '{0}' must be an enum.
                throw new InvalidOperationException(SR.Format(SR.XmlChoiceIdentifierTypeEnum, identifierName));
            }
            return type;
        }