共用方式為


XNode.NodesBeforeSelf 方法

定義

依照文件順序,傳回這個節點之前同層級節點的集合。

public:
 System::Collections::Generic::IEnumerable<System::Xml::Linq::XNode ^> ^ NodesBeforeSelf();
public System.Collections.Generic.IEnumerable<System.Xml.Linq.XNode> NodesBeforeSelf ();
member this.NodesBeforeSelf : unit -> seq<System.Xml.Linq.XNode>
Public Function NodesBeforeSelf () As IEnumerable(Of XNode)
Public Iterator Function NodesBeforeSelf () As IEnumerable(Of XNode)

傳回

IEnumerable<T>,屬於這個節點之前同層級節點 (依照文件順序) 的 XNode

範例

下列範例會建立 XML 樹狀結構,然後使用這個軸方法查詢樹狀結構。

XElement xmlTree = new XElement("Root",  
    new XText("Text content."),  
    new XElement("Child1", "child1 content"),  
    new XElement("Child2", "child2 content"),  
    new XText("More text content."),  
    new XElement("child3", "child3 content")  
);  
XElement child = xmlTree.Element("Child2");  
IEnumerable<XNode> nodes =  
    from node in child.NodesBeforeSelf()  
    select node;  
foreach (XNode node in nodes)  
    Console.WriteLine("Node type: {0}  {1}",  
        node.NodeType,  
        node.NodeType == XmlNodeType.Text ? (node as XText).Value : "");  
Dim xmlTree As XElement = New XElement("Root", _  
    New XText("Text content."), _  
    New XElement("Child1", "child1 content"), _  
    New XElement("Child2", "child2 content"), _  
    New XText("More text content."), _  
    New XElement("child3", "child3 content") _  
)  

Dim child As XElement = xmlTree.Element("Child2")  
Dim nodes As IEnumerable(Of XNode) = _  
    From node In child.NodesBeforeSelf() _  
    Select node  
For Each node As XNode In nodes  
    Dim s As String = ""  
    If node.NodeType = XmlNodeType.Text Then  
        s = DirectCast(node, XText).Value  
    End If  
    Console.WriteLine("Node type: {0}  {1}", node.NodeType, s)  
Next  

這個範例會產生下列輸出:

Node type: Text  Text content.  
Node type: Element  

備註

這個方法只會在傳回的集合中包含同層級。 它不包含子系。

這個方法會使用延後的執行。

適用於

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