xmlnode 的value與innertext區(qū)別

隱形的翅膀 2008-02-28

展開全文

1。當node是葉子節(jié)點時

XmlDocument doc = new XmlDocument();

doc.LoadXml("<right>a</right>");

XmlNode root = doc.DocumentElement;
Console.WriteLine(root.InnerText);

結(jié)果是：a

2。當node是父節(jié)點時，將包括子節(jié)點的所有的innertext顯示出來

XmlDocument doc = new XmlDocument();

doc.LoadXml("<root name=‘jack‘ value = ‘jacky‘ ><right>a</right><left>b</left>content</root>");

XmlNode root = doc.DocumentElement;
Console.WriteLine(root.InnerText);

結(jié)果是：abcontent

3。顯示屬性值

如果想顯示root的name屬性值，可以通過innertext和value獲得

XmlDocument doc = new XmlDocument();

doc.LoadXml("<root name=‘jack‘ value = ‘jacky‘ ><right id =‘007‘>a</right><left>b</left>content</root>");

XmlNode root = doc.DocumentElement;
XmlNode node = root.SelectSingleNode("right");

Console.WriteLine(node.Attributes["id"].InnerText);
Console.WriteLine(node.Attributes["id"].Value);

或者 XmlNode root = doc.DocumentElement;
XmlNode node = root.SelectSingleNode("right");
node = node.SelectSingleNode("@id");

Console.WriteLine(node.InnerText);
Console.WriteLine(node.Value);

4。當取節(jié)點的Value時，我們發(fā)現(xiàn)為空

XmlNode root = doc.DocumentElement;
XmlNode node = root.SelectSingleNode("right");

Console.WriteLine(node.Value);//rerult is null reference
Console.WriteLine(node.InnerText);// result is a

原因是：

value這個屬性比較特殊，它返回的值與當前節(jié)點的nodetype有關(guān)：（MSDN）

Type	Value
Attribute	The value of the attribute.
CDATASection	The content of the CDATA Section.
Comment	The content of the comment.
Document	a null reference (Nothing in Visual Basic).
DocumentFragment	a null reference (Nothing in Visual Basic).
DocumentType	a null reference (Nothing in Visual Basic).
Element	a null reference (Nothing in Visual Basic). You can use the XmlElement.InnerText or XmlElement.InnerXml properties to access the value of the element node.
Entity	a null reference (Nothing in Visual Basic).
EntityReference	a null reference (Nothing in Visual Basic).
Notation	a null reference (Nothing in Visual Basic).
ProcessingInstruction	The entire content excluding the target.
Text	The content of the text node.