XmlWhitespace.cs

using System.Xml.XPath;

namespace System.Xml
{
    public class XmlWhitespace : XmlCharacterData
    {
        public override string Name => OwnerDocument.strNonSignificantWhitespaceName;

        public override string LocalName => OwnerDocument.strNonSignificantWhitespaceName;

        public override XmlNodeType NodeType => XmlNodeType.Whitespace;

        public override XmlNode ParentNode
        {
            get
            {
                switch (base.parentNode.NodeType)
                {
                case XmlNodeType.Document:
                    return base.ParentNode;
                case XmlNodeType.Text:
                case XmlNodeType.CDATA:
                case XmlNodeType.Whitespace:
                case XmlNodeType.SignificantWhitespace:
                {
                    XmlNode parentNode = base.parentNode.parentNode;
                    while (parentNode.IsText)
                    {
                        parentNode = parentNode.parentNode;
                    }
                    return parentNode;
                }
                default:
                    return base.parentNode;
                }
            }
        }

        public override string Value
        {
            get
            {
                return Data;
            }
            set
            {
                if (CheckOnData(value))
                {
                    Data = value;
                    return;
                }
                throw new ArgumentException(Res.GetString("Xdom_WS_Char"));
            }
        }

        internal override XPathNodeType XPNodeType
        {
            get
            {
                XPathNodeType xnt = XPathNodeType.Whitespace;
                DecideXPNodeTypeForTextNodes(this, ref xnt);
                return xnt;
            }
        }

        internal override bool IsText => true;

        public override XmlNode PreviousText
        {
            get
            {
                if (parentNode.IsText)
                {
                    return parentNode;
                }
                return null;
            }
        }

        protected internal XmlWhitespace(string strData, XmlDocument doc)
            : base(strData, doc)
        {
            if (!doc.IsLoading && !CheckOnData(strData))
            {
                throw new ArgumentException(Res.GetString("Xdom_WS_Char"));
            }
        }

        public override XmlNode CloneNode(bool deep)
        {
            return OwnerDocument.CreateWhitespace(Data);
        }

        public override void WriteTo(XmlWriter w)
        {
            w.WriteWhitespace(Data);
        }

        public override void WriteContentTo(XmlWriter w)
        {
        }
    }
}