XContainer.DescendantNodes 方法
定义
按文档顺序返回此文档或元素的子代节点集合。Returns a collection of the descendant nodes for this document or element, in document order.
public:
System::Collections::Generic::IEnumerable<System::Xml::Linq::XNode ^> ^ DescendantNodes();
public System.Collections.Generic.IEnumerable<System.Xml.Linq.XNode> DescendantNodes ();
member this.DescendantNodes : unit -> seq<System.Xml.Linq.XNode>
Public Function DescendantNodes () As IEnumerable(Of XNode)
返回
XNode 的 IEnumerable<T>,其中按文档顺序包含 XContainer 的子代节点。An IEnumerable<T> of XNode containing the descendant nodes of the XContainer, in document order.
示例
下面的示例创建一个 XML 树,然后循环访问该 DescendantNodes 轴。The following example creates an XML tree, and then iterates through the DescendantNodes axis.
XElement xmlTree = new XElement("Root",
// Attributes are not nodes, so will not be returned by DescendantNodes.
new XAttribute("Att1", "AttributeContent"),
new XElement("Child",
new XElement("GrandChild", "element content")
)
);
IEnumerable<XNode> dnas =
from node in xmlTree.DescendantNodes()
select node;
foreach (XNode node in dnas)
{
if (node is XElement)
Console.WriteLine((node as XElement).Name);
else
Console.WriteLine(node);
}
' Attributes are not nodes, so will not be returned by DescendantNodes.
Dim xmlTree As XElement = _
<Root Att1="AttributeContent">
<Child>
<GrandChild>element content</GrandChild>
</Child>
</Root>
Dim dnas = From node In xmlTree.DescendantNodes _
Select node
For Each node In dnas
If TypeOf node Is XElement Then
Console.WriteLine(DirectCast(node, XElement).Name)
Else
Console.WriteLine(node)
End If
Next
该示例产生下面的输出:This example produces the following output:
Child
GrandChild
element content
注解
请注意,属性不会被视为 LINQ to XML 中的节点,因此它们不会成为此方法返回的集合的一部分。Note that attributes are not considered to be nodes in LINQ to XML, so they will not be part of the collection that is returned by this method.
此方法使用延迟执行。This method uses deferred execution.