Extensions.Elements 方法

定義

傳回來源集合中每個項目和文件的子項目集合。Returns a collection of the child elements of every element and document in the source collection.

多載

Elements<T>(IEnumerable<T>)

傳回來源集合中每個項目和文件的子項目集合。Returns a collection of the child elements of every element and document in the source collection.

Elements<T>(IEnumerable<T>, XName)

傳回來源集合中每個項目和文件的已篩選子項目集合。Returns a filtered collection of the child elements of every element and document in the source collection. 集合中只會包含具有相符之 XName 的項目。Only elements that have a matching XName are included in the collection.

備註

Visual Basic 包含一個整合的元素軸,可讓您 XName 針對來源集合中的每個元素,尋找具有指定的所有子項目。Visual Basic contains an integrated elements axis that allows you to find all child elements with a specified XName for every element in the source collection.

這個方法會使用延後的執行。This method uses deferred execution.

Elements<T>(IEnumerable<T>)

傳回來源集合中每個項目和文件的子項目集合。Returns a collection of the child elements of every element and document in the source collection.

public:
generic <typename T>
 where T : System::Xml::Linq::XContainer[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ Elements(System::Collections::Generic::IEnumerable<T> ^ source);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Elements<T> (this System.Collections.Generic.IEnumerable<T> source) where T : System.Xml.Linq.XContainer;
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Elements<T> (this System.Collections.Generic.IEnumerable<T?> source) where T : System.Xml.Linq.XContainer;
static member Elements : seq<'T (requires 'T :> System.Xml.Linq.XContainer)> -> seq<System.Xml.Linq.XElement> (requires 'T :> System.Xml.Linq.XContainer)
<Extension()>
Public Function Elements(Of T As XContainer) (source As IEnumerable(Of T)) As IEnumerable(Of XElement)

類型參數

T

source 中物件的型別,限制為 XContainerThe type of the objects in source, constrained to XContainer.

參數

source
IEnumerable<T>

IEnumerable<T>XElement,其中包含來源集合。An IEnumerable<T> of XElement that contains the source collection.

傳回

IEnumerable<XElement>

來源集合中每個項目或文件的子項目之 IEnumerable<T>XElementAn IEnumerable<T> of XElement of the child elements of every element or document in the source collection.

範例

下列範例會使用的元素名稱來抓取專案的集合 ChildThe following example retrieves a collection of elements with the element name of Child. 然後,它會使用此座標軸方法來取出集合的所有子專案。It then uses this axis method to retrieve all child elements of the collection.

XElement xmlTree = new XElement("Root",  
    new XElement("Child",  
        new XElement("GrandChild1", 1),  
        new XElement("GrandChild2", 2)  
    ),  
    new XElement("Child",  
        new XElement("GrandChild3", 3),  
        new XElement("GrandChild4", 4)  
    ),  
    new XElement("Child",  
        new XElement("GrandChild5", 5),  
        new XElement("GrandChild6", 6)  
    )  
);  

IEnumerable<XElement> allGrandChildren =  
    from el in xmlTree.Elements("Child").Elements()  
    select el;  

foreach (XElement el in allGrandChildren)  
    Console.WriteLine(el);  
Dim xmlTree As XElement = _  
     <Root>  
          <Child>  
              <GrandChild1>1</GrandChild1>  
              <GrandChild2>2</GrandChild2>  
          </Child>  

          <Child>  
              <GrandChild3>3</GrandChild3>  
              <GrandChild4>4</GrandChild4>  
          </Child>  

          <Child>  
              <GrandChild5>5</GrandChild5>  
              <GrandChild6>6</GrandChild6>  
          </Child>  
      </Root>  

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

For Each el As XElement In allGrandChildren  
    Console.WriteLine(el)  
Next  

這個範例會產生下列輸出:This example produces the following output:

<GrandChild1>1</GrandChild1>  
<GrandChild2>2</GrandChild2>  
<GrandChild3>3</GrandChild3>  
<GrandChild4>4</GrandChild4>  
<GrandChild5>5</GrandChild5>  
<GrandChild6>6</GrandChild6>  

以下是相同的範例,但在此情況下,XML 會在命名空間中。The following is the same example, but in this case the XML is in a namespace. 如需詳細資訊,請參閱使用 XML 命名空間For more information, see Work with XML Namespaces.

XNamespace aw = "http://www.adventure-works.com";  
XElement xmlTree = new XElement(aw + "Root",  
    new XElement(aw + "Child",  
        new XElement(aw + "GrandChild1", 1),  
        new XElement(aw + "GrandChild2", 2)  
    ),  
    new XElement(aw + "Child",  
        new XElement(aw + "GrandChild3", 3),  
        new XElement(aw + "GrandChild4", 4)  
    ),  
    new XElement(aw + "Child",  
        new XElement(aw + "GrandChild5", 5),  
        new XElement(aw + "GrandChild6", 6)  
    )  
);  

IEnumerable<XElement> allGrandChildren =  
    from el in xmlTree.Elements(aw + "Child").Elements()  
    select el;  

foreach (XElement el in allGrandChildren)  
    Console.WriteLine(el);  
Imports <xmlns="http://www.adventure-works.com">  

Module Module1  
    Sub Main()  
        Dim xmlTree As XElement = _  
             <Root>  
                 <Child>  
                     <GrandChild1>1</GrandChild1>  
                     <GrandChild2>2</GrandChild2>  
                 </Child>  

                 <Child>  
                     <GrandChild3>3</GrandChild3>  
                     <GrandChild4>4</GrandChild4>  
                 </Child>  

                 <Child>  
                     <GrandChild5>5</GrandChild5>  
                     <GrandChild6>6</GrandChild6>  
                 </Child>  
             </Root>  

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

        For Each el As XElement In allGrandChildren  
            Console.WriteLine(el)  
        Next  
    End Sub  
End Module  

這個範例會產生下列輸出:This example produces the following output:

<GrandChild1 xmlns="http://www.adventure-works.com">1</GrandChild1>  
<GrandChild2 xmlns="http://www.adventure-works.com">2</GrandChild2>  
<GrandChild3 xmlns="http://www.adventure-works.com">3</GrandChild3>  
<GrandChild4 xmlns="http://www.adventure-works.com">4</GrandChild4>  
<GrandChild5 xmlns="http://www.adventure-works.com">5</GrandChild5>  
<GrandChild6 xmlns="http://www.adventure-works.com">6</GrandChild6>  

備註

雖然 Visual Basic 包含整合元素軸,可讓您使用針對來源集合中每個專案的指定來尋找所有子專案,但是沒有 XName 任何整合的元素軸可讓您針對來源集合中的每個專案,取得每個子專案的集合。Although Visual Basic contains an integrated elements axis that allows you to find all child elements with a specified XName for every element in the source collection, there is no integrated elements axis that allows you to retrieve a collection of every child element for every element in the source collection.

這個方法會使用延後的執行。This method uses deferred execution.

另請參閱

適用於

Elements<T>(IEnumerable<T>, XName)

傳回來源集合中每個項目和文件的已篩選子項目集合。Returns a filtered collection of the child elements of every element and document in the source collection. 集合中只會包含具有相符之 XName 的項目。Only elements that have a matching XName are included in the collection.

public:
generic <typename T>
 where T : System::Xml::Linq::XContainer[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ Elements(System::Collections::Generic::IEnumerable<T> ^ source, System::Xml::Linq::XName ^ name);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Elements<T> (this System.Collections.Generic.IEnumerable<T> source, System.Xml.Linq.XName name) where T : System.Xml.Linq.XContainer;
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Elements<T> (this System.Collections.Generic.IEnumerable<T?> source, System.Xml.Linq.XName? name) where T : System.Xml.Linq.XContainer;
static member Elements : seq<'T (requires 'T :> System.Xml.Linq.XContainer)> * System.Xml.Linq.XName -> seq<System.Xml.Linq.XElement> (requires 'T :> System.Xml.Linq.XContainer)
<Extension()>
Public Function Elements(Of T As XContainer) (source As IEnumerable(Of T), name As XName) As IEnumerable(Of XElement)

類型參數

T

source 中物件的型別,限制為 XContainerThe type of the objects in source, constrained to XContainer.

參數

source
IEnumerable<T>

IEnumerable<T>XElement,其中包含來源集合。An IEnumerable<T> of XElement that contains the source collection.

name
XName

要比對的 XNameThe XName to match.

傳回

IEnumerable<XElement>

來源集合中每個項目和文件之 IEnumerable<T>XElementAn IEnumerable<T> of XElement of the child elements of every element and document in the source collection. 集合中只會包含具有相符之 XName 的項目。Only elements that have a matching XName are included in the collection.

範例

當您想要在特定深度取得具有指定名稱的所有專案時,這個擴充方法會很有用。This extension method is useful when you want to retrieve all elements with a specified name at a particular depth. 如果檔非常正常,則這很簡單,但如果檔不尋常,可能會比較困難。This is easy if the document is very regular, but if the document is irregular, it can be a bit more difficult. 在下列範例中,我們想要取出 aaa 元素子系的所有元素 ItemIn the following example, we want to retrieve all aaa elements that are children of Item elements. 指定的專案不 Item 一定會包含 aaa 元素。A given Item element may or may not contain an aaa element. 您可以使用此擴充方法輕鬆完成這項作業,如下所示:This is easily accomplished using this extension method, as follows:

XElement xmlTree = new XElement("Root",  
    new XElement("Item",  
        new XElement("aaa", 1),  
        new XElement("bbb", 2)  
    ),  
    new XElement("Item",  
        new XElement("ccc", 3),  
        new XElement("aaa", 4)  
    ),  
    new XElement("Item",  
        new XElement("ddd", 5),  
        new XElement("eee", 6)  
    )  
);  

IEnumerable<XElement> allGrandChildren =  
    from el in xmlTree.Elements("Item").Elements("aaa")  
    select el;  

foreach (XElement el in allGrandChildren)  
    Console.WriteLine(el);  
Dim xmlTree As XElement = _  
    <Root>  
        <Item>  
            <aaa>1</aaa>  
            <bbb>2</bbb>  
        </Item>  

        <Item>  
            <ccc>3</ccc>  
            <aaa>4</aaa>  
        </Item>  

        <Item>  
            <ddd>5</ddd>  
            <eee>6</eee>  
        </Item>  
    </Root>  

Dim allGrandChildren = From el In xmlTree.<Item>.<aaa> _  
                       Select el  

For Each el As XElement In allGrandChildren  
    Console.WriteLine(el)  
Next  

這個範例會產生下列輸出:This example produces the following output:

<aaa>1</aaa>  
<aaa>4</aaa>  

以下是相同的範例,但在此情況下,XML 會在命名空間中。The following is the same example, but in this case the XML is in a namespace. 如需詳細資訊,請參閱使用 XML 命名空間For more information, see Work with XML Namespaces.

XNamespace aw = "http://www.adventure-works.com";  
XElement xmlTree = new XElement(aw + "Root",  
    new XElement(aw + "Item",  
        new XElement(aw + "aaa", 1),  
        new XElement(aw + "bbb", 2)  
    ),  
    new XElement(aw + "Item",  
        new XElement(aw + "ccc", 3),  
        new XElement(aw + "aaa", 4)  
    ),  
    new XElement(aw + "Item",  
        new XElement(aw + "ddd", 5),  
        new XElement(aw + "eee", 6)  
    )  
);  

IEnumerable<XElement> allGrandChildren =  
    from el in xmlTree.Elements(aw + "Item").Elements(aw + "aaa")  
    select el;  

foreach (XElement el in allGrandChildren)  
    Console.WriteLine(el);  
Imports <xmlns="http://www.adventure-works.com">  

Module Module1  
    Sub Main()  
        Dim xmlTree As XElement = _  
            <Root>  
                <Item>  
                    <aaa>1</aaa>  
                    <bbb>2</bbb>  
                </Item>  

                <Item>  
                    <ccc>3</ccc>  
                    <aaa>4</aaa>  
                </Item>  

                <Item>  
                    <ddd>5</ddd>  
                    <eee>6</eee>  
                </Item>  
            </Root>  

        Dim allGrandChildren = From el In xmlTree.<Item>.<aaa> _  
                               Select el  

        For Each el As XElement In allGrandChildren  
            Console.WriteLine(el)  
        Next  
    End Sub  
End Module  

這個範例會產生下列輸出:This example produces the following output:

<aaa xmlns="http://www.adventure-works.com">1</aaa>  
<aaa xmlns="http://www.adventure-works.com">4</aaa>  

備註

Visual Basic 使用者可以使用 [整合元素] 軸來抓取集合中每個元素的子專案。Visual Basic users can use the integrated elements axis to retrieve the child elements of every element in a collection.

這個方法會使用延後的執行。This method uses deferred execution.

另請參閱

適用於