SettingValueElement.cs

using System.Xml;

namespace System.Configuration
{
    public sealed class SettingValueElement : ConfigurationElement
    {
        private static volatile ConfigurationPropertyCollection _properties;

        private static XmlDocument doc = new XmlDocument();

        private XmlNode _valueXml;

        private bool isModified;

        protected internal override ConfigurationPropertyCollection Properties
        {
            protected get
            {
                if (_properties == null)
                {
                    _properties = new ConfigurationPropertyCollection();
                }
                return _properties;
            }
        }

        public XmlNode ValueXml
        {
            get
            {
                return _valueXml;
            }
            set
            {
                _valueXml = value;
                isModified = true;
            }
        }

        protected override void DeserializeElement(XmlReader reader, bool serializeCollectionKey)
        {
            ValueXml = doc.ReadNode(reader);
        }

        public override bool Equals(object settingValue)
        {
            SettingValueElement settingValueElement = settingValue as SettingValueElement;
            if (settingValueElement != null)
            {
                return object.Equals(settingValueElement.ValueXml, ValueXml);
            }
            return false;
        }

        public override int GetHashCode()
        {
            return ValueXml.GetHashCode();
        }

        protected override bool IsModified()
        {
            return isModified;
        }

        protected override void ResetModified()
        {
            isModified = false;
        }

        protected override bool SerializeToXmlElement(XmlWriter writer, string elementName)
        {
            if (ValueXml != null)
            {
                if (writer != null)
                {
                    ValueXml.WriteTo(writer);
                }
                return true;
            }
            return false;
        }

        protected override void Reset(ConfigurationElement parentElement)
        {
            base.Reset(parentElement);
            ValueXml = ((SettingValueElement)parentElement).ValueXml;
        }

        protected override void Unmerge(ConfigurationElement sourceElement, ConfigurationElement parentElement, ConfigurationSaveMode saveMode)
        {
            base.Unmerge(sourceElement, parentElement, saveMode);
            ValueXml = ((SettingValueElement)sourceElement).ValueXml;
        }
    }
}