XContainer.Descendants 方法

Source:

XContainer.cs

Source:

XContainer.cs

Source:

XContainer.cs

public:
 System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ Descendants();

public System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Descendants();

member this.Descendants : unit -> seq<System.Xml.Linq.XElement>

Public Function Descendants () As IEnumerable(Of XElement)

返回

XElement 的 IEnumerable<T>，其中包含 XContainer 的子代元素。

示例

以下示例创建一个 XML 树，然后使用此轴方法检索后代。

XElement xmlTree = new XElement("Root",  
    new XAttribute("Att1", "AttributeContent"),  
    new XElement("Child",  
        new XText("Some text"),  
        new XElement("GrandChild", "element content")  
    )  
);  
IEnumerable<XElement> de =  
    from el in xmlTree.Descendants()  
    select el;  
foreach (XElement el in de)  
    Console.WriteLine(el.Name);  

' Attributes are not nodes, so will not be returned by DescendantNodes.  
Dim xmlTree As XElement = _  
    <Root Att1="AttributeContent">  
        <Child>Some text  
            <GrandChild>element content</GrandChild>  
        </Child>  
    </Root>  
Dim de = From el In xmlTree.Descendants _  
         Select el  

For Each el In de  
    Console.WriteLine(el.Name)  
Next  

该示例产生下面的输出：

Child  
GrandChild  

注解

请注意，此方法不会在生成的 IEnumerable<T>中返回自身。 查看 DescendantsAndSelf 是否需要在结果中包含当前 XElement 。

此方法使用延迟执行。

另请参阅

• DescendantsAndSelf()
• DescendantNodes()
• Elements
• LINQ to XML 概述

Source:

XContainer.cs

Source:

XContainer.cs

Source:

XContainer.cs

public:
 System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ Descendants(System::Xml::Linq::XName ^ name);

public System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Descendants(System.Xml.Linq.XName name);

public System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Descendants(System.Xml.Linq.XName? name);

member this.Descendants : System.Xml.Linq.XName -> seq<System.Xml.Linq.XElement>

Public Function Descendants (name As XName) As IEnumerable(Of XElement)

参数

返回

XElement 的 IEnumerable<T>，其中包含与指定 XName 相匹配的 XContainer 的子代元素。

示例

以下示例打印元素的所有后代。

// Attributes are not nodes, so will not be returned by DescendantNodes.  
XElement xmlTree = new XElement("Root",  
    new XAttribute("Att1", "AttributeContent"),  
    new XElement("Child",  
        new XText("Some text"),  
        new XElement("GrandChild", "element content")  
    )  
);  
IEnumerable<XElement> de =  
    from el in xmlTree.Descendants("Child")  
    select el;  
foreach (XElement el in de)  
    Console.WriteLine(el.Name);  

' Attributes are not nodes, so will not be returned by the descendants axis.  
Dim xmlTree As XElement = _   
    <Root Att1="AttributeContent">  
         <Child>Some text  
             <GrandChild>element content</GrandChild>  
         </Child>  
     </Root>  

Dim de = From el In xmlTree...<Child> _  
         Select el  

For Each el In de  
    Console.WriteLine(el.Name)  
Next  

该示例产生下面的输出：

Child  

下面是相同的示例，但在本例中，XML 位于 命名空间中。 有关详细信息，请参阅 使用 XML 命名空间。

// Attributes are not nodes, so will not be returned by DescendantNodes.  
XNamespace aw = "http://www.adventure-works.com";  
XElement xmlTree = new XElement(aw + "Root",  
    new XAttribute(aw + "Att1", "AttributeContent"),  
    new XElement(aw + "Child",  
        new XText("Some text"),  
        new XElement(aw + "GrandChild", "element content")  
    )  
);  
IEnumerable<XElement> de =  
    from el in xmlTree.Descendants(aw + "Child")  
    select el;  
foreach (XElement el in de)  
    Console.WriteLine(el.Name);  

Imports <xmlns:aw = "http://www.adventure-works.com">  

Module Module1  
    Sub Main()  
        ' Attributes are not nodes, so will not be returned by the descendants axis.  
        Dim xmlTree As XElement = _   
            <aw:Root aw:Att1="AttributeContent">  
                 <aw:Child>Some text  
                     <aw:GrandChild>element content</aw:GrandChild>  
                 </aw:Child>  
             </aw:Root>  

        Dim de = From el In xmlTree...<aw:Child> _  
                 Select el  

        For Each el In de  
            Console.WriteLine(el.Name)  
        Next  
    End Sub  
End Module  

该示例产生下面的输出：

{http://www.adventure-works.com}Child  

注解

此方法使用延迟执行。

另请参阅

• DescendantNodes()
• Elements
• LINQ to XML 概述