System.Xml.Serialization.XmlSerializationWriterCodeGen.FindChoiceEnumValue C# (CSharp) Method

        private string FindChoiceEnumValue(ElementAccessor element, EnumMapping choiceMapping, bool useReflection)
        {
            string enumValue = null;

            for (int i = 0; i < choiceMapping.Constants.Length; i++)
            {
                string xmlName = choiceMapping.Constants[i].XmlName;

                if (element.Any && element.Name.Length == 0)
                {
                    if (xmlName == "##any:")
                    {
                        if (useReflection)
                            enumValue = choiceMapping.Constants[i].Value.ToString(CultureInfo.InvariantCulture);
                        else
                            enumValue = choiceMapping.Constants[i].Name;
                        break;
                    }
                    continue;
                }
                int colon = xmlName.LastIndexOf(':');
                string choiceNs = colon < 0 ? choiceMapping.Namespace : xmlName.Substring(0, colon);
                string choiceName = colon < 0 ? xmlName : xmlName.Substring(colon + 1);

                if (element.Name == choiceName)
                {
                    if ((element.Form == XmlSchemaForm.Unqualified && string.IsNullOrEmpty(choiceNs)) || element.Namespace == choiceNs)
                    {
                        if (useReflection)
                            enumValue = choiceMapping.Constants[i].Value.ToString(CultureInfo.InvariantCulture);
                        else
                            enumValue = choiceMapping.Constants[i].Name;
                        break;
                    }
                }
            }
            if (enumValue == null || enumValue.Length == 0)
            {
                if (element.Any && element.Name.Length == 0)
                {
                    // Type {0} is missing enumeration value '##any' for XmlAnyElementAttribute.
                    throw new InvalidOperationException(SR.Format(SR.XmlChoiceMissingAnyValue, choiceMapping.TypeDesc.FullName));
                }
                // Type {0} is missing value for '{1}'.
                throw new InvalidOperationException(SR.Format(SR.XmlChoiceMissingValue, choiceMapping.TypeDesc.FullName, element.Namespace + ":" + element.Name, element.Name, element.Namespace));
            }
            if (!useReflection)
                CodeIdentifier.CheckValidIdentifier(enumValue);
            return enumValue;
        }
    }