Extensions.Ancestors Extensions.Ancestors Extensions.Ancestors Extensions.Ancestors Method

定義

傳回包含來源集合中每個節點祖系的項目集合。Returns a collection of elements that contains the ancestors of every node in the source collection.

多載

Ancestors<T>(IEnumerable<T>) Ancestors<T>(IEnumerable<T>) Ancestors<T>(IEnumerable<T>) Ancestors<T>(IEnumerable<T>)

傳回包含來源集合中每個節點祖系的項目集合。Returns a collection of elements that contains the ancestors of every node in the source collection.

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

傳回包含來源集合中每個節點祖系的已篩選項目集合。Returns a filtered collection of elements that contains the ancestors of every node 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

如果來源集合中的多個節點具有相同的上階,則會在結果集合中多次包含祖系。If multiple nodes in the source collection have the same ancestor, the ancestor will be included multiple times in the result collection. 若要避免這Distinct種情況,請使用方法。To avoid this, use the Distinct method.

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

Ancestors<T>(IEnumerable<T>) Ancestors<T>(IEnumerable<T>) Ancestors<T>(IEnumerable<T>) Ancestors<T>(IEnumerable<T>)

傳回包含來源集合中每個節點祖系的項目集合。Returns a collection of elements that contains the ancestors of every node in the source collection.

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

類型參數

T

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

參數

source
IEnumerable<T> IEnumerable<T> IEnumerable<T> IEnumerable<T>

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

傳回

IEnumerable<T>XElement,其中包含來源集合中每個節點的祖系。An IEnumerable<T> of XElement that contains the ancestors of every node in the source collection.

範例

下列範例會抓取絕佳孫系元素的集合。The following example retrieves a collection of the great grandchildren elements. 然後,它會使用此 axis 方法來抓取集合中所有專案的所有祖系。It then uses this axis method to retrieve all ancestors of all elements in the collection.

XElement xmlTree = new XElement("Root",  
    new XElement("Child1",  
        new XElement("GrandChild1",  
            new XElement("GreatGrandChild1", "content")  
        )  
    ),  
    new XElement("Child2",  
        new XElement("GrandChild2",  
            new XElement("GreatGrandChild2", "content")  
        )  
    )  
);  
IEnumerable<XElement> greatGrandChildren =  
    from el in xmlTree.Descendants()  
    where el.Name.LocalName.StartsWith("Great")  
    select el;  
  
Console.WriteLine("Great Grand Children Elements");  
Console.WriteLine("----");  
foreach (XElement de in greatGrandChildren)  
    Console.WriteLine(de.Name);  
  
IEnumerable<XElement> allAncestors =  
    from el in greatGrandChildren.Ancestors().Distinct()  
    select el;  
  
Console.WriteLine("");  
Console.WriteLine("Ancestors");  
Console.WriteLine("----");  
foreach (XElement de in allAncestors)  
    Console.WriteLine(de.Name);  
Dim xmlTree As XElement = _  
    <Root>  
        <Child1>  
            <GrandChild1>  
                <GreatGrandChild1>content</GreatGrandChild1>  
            </GrandChild1>  
        </Child1>  
        <Child2>  
            <GrandChild2>  
                <GreatGrandChild2>content</GreatGrandChild2>  
            </GrandChild2>  
        </Child2>  
    </Root>  
  
Dim greatGrandChildren = From el In xmlTree.Descendants _  
                         Where el.Name.LocalName.StartsWith("Great") _  
                         Select el  
  
Console.WriteLine("Great Grand Children Elements")  
Console.WriteLine("----")  
  
For Each de As XElement In greatGrandChildren  
    Console.WriteLine(de.Name)  
Next  
  
Dim allAncestors = From el In greatGrandChildren.Ancestors.Distinct _  
                   Select el  
  
Console.WriteLine("")  
Console.WriteLine("Ancestors")  
Console.WriteLine("----")  
  
For Each de As XElement In allAncestors  
    Console.WriteLine(de.Name)  
Next  

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

Great Grand Children Elements  
----  
GreatGrandChild1  
GreatGrandChild2  
  
Ancestors  
----  
GrandChild1  
Child1  
Root  
GrandChild2  
Child2  

下列是相同的範例,但在此情況下,XML 是在命名空間中。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 Working with XML Namespaces.

XNamespace aw = "http://www.adventure-works.com";  
XElement xmlTree = new XElement(aw + "Root",  
    new XElement(aw + "Child1",  
        new XElement(aw + "GrandChild1",  
            new XElement(aw + "GreatGrandChild1", "content")  
        )  
    ),  
    new XElement(aw + "Child2",  
        new XElement(aw + "GrandChild2",  
            new XElement(aw + "GreatGrandChild2", "content")  
        )  
    )  
);  
IEnumerable<XElement> greatGrandChildren =  
    from el in xmlTree.Descendants()  
    where el.Name.LocalName.StartsWith("Great")  
    select el;  
  
Console.WriteLine("Great Grand Children Elements");  
Console.WriteLine("----");  
foreach (XElement de in greatGrandChildren)  
    Console.WriteLine(de.Name);  
  
IEnumerable<XElement> allAncestors =  
    from el in greatGrandChildren.Ancestors().Distinct()  
    select el;  
  
Console.WriteLine("");  
Console.WriteLine("Ancestors");  
Console.WriteLine("----");  
foreach (XElement de in allAncestors)  
    Console.WriteLine(de.Name);  
Imports <xmlns="http://www.adventure-works.com">  
  
Module Module1  
    Sub Main()  
        Dim xmlTree As XElement = _  
            <Root>  
                <Child1>  
                    <GrandChild1>  
                        <GreatGrandChild1>content</GreatGrandChild1>  
                    </GrandChild1>  
                </Child1>  
                <Child2>  
                    <GrandChild2>  
                        <GreatGrandChild2>content</GreatGrandChild2>  
                    </GrandChild2>  
                </Child2>  
            </Root>  
  
        Dim greatGrandChildren = From el In xmlTree.Descendants _  
                                 Where el.Name.LocalName.StartsWith("Great") _  
                                 Select el  
  
        Console.WriteLine("Great Grand Children Elements")  
        Console.WriteLine("----")  
  
        For Each de As XElement In greatGrandChildren  
            Console.WriteLine(de.Name)  
        Next  
  
        Dim allAncestors = From el In greatGrandChildren.Ancestors.Distinct _  
                           Select el  
  
        Console.WriteLine("")  
        Console.WriteLine("Ancestors")  
        Console.WriteLine("----")  
  
        For Each de As XElement In allAncestors  
            Console.WriteLine(de.Name)  
        Next  
    End Sub  
End Module  

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

Great Grand Children Elements  
----  
{http://www.adventure-works.com}GreatGrandChild1  
{http://www.adventure-works.com}GreatGrandChild2  
  
Ancestors  
----  
{http://www.adventure-works.com}GrandChild1  
{http://www.adventure-works.com}Child1  
{http://www.adventure-works.com}Root  
{http://www.adventure-works.com}GrandChild2  
{http://www.adventure-works.com}Child2  

備註

如果來源集合中的多個節點具有相同的上階,則會在結果集合中多次包含祖系。If multiple nodes in the source collection have the same ancestor, the ancestor will be included multiple times in the result collection. 若要避免這Distinct種情況,請使用方法。To avoid this, use the Distinct method.

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

另請參閱

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

傳回包含來源集合中每個節點祖系的已篩選項目集合。Returns a filtered collection of elements that contains the ancestors of every node 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::XNode[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ Ancestors(System::Collections::Generic::IEnumerable<T> ^ source, System::Xml::Linq::XName ^ name);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> Ancestors<T> (this System.Collections.Generic.IEnumerable<T> source, System.Xml.Linq.XName name) where T : System.Xml.Linq.XNode;
static member Ancestors : seq<'T (requires 'T :> System.Xml.Linq.XNode)> * System.Xml.Linq.XName -> seq<System.Xml.Linq.XElement> (requires 'T :> System.Xml.Linq.XNode)
<Extension()>
Public Function Ancestors(Of T As XNode) (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 XNodeThe type of the objects in source, constrained to XNode.

參數

source
IEnumerable<T> IEnumerable<T> IEnumerable<T> IEnumerable<T>

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

name
XName XName XName XName

要比對的 XNameThe XName to match.

傳回

IEnumerable<T>XElement,其中包含來源集合中每個節點的祖系。An IEnumerable<T> of XElement that contains the ancestors of every node 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

下列範例會抓取絕佳孫系元素的集合。The following example retrieves a collection of the great grandchildren elements. 然後,它會使用這個座標軸方法,來抓取集合中所有符合指定XName之專案的所有祖系。It then uses this axis method to retrieve all ancestors of all elements in the collection that match a specified XName.

XElement xmlTree = new XElement("Root",  
    new XElement("Child1",  
        new XElement("GrandChild1",  
            new XElement("GreatGrandChild1", "content")  
        )  
    ),  
    new XElement("Child2",  
        new XElement("GrandChild2",  
            new XElement("GreatGrandChild2", "content")  
        )  
    )  
);  
IEnumerable<XElement> greatGrandChildren =  
    from el in xmlTree.Descendants()  
    where el.Name.LocalName.StartsWith("Great")  
    select el;  
  
Console.WriteLine("Great Grand Children Elements");  
Console.WriteLine("----");  
foreach (XElement de in greatGrandChildren)  
    Console.WriteLine(de.Name);  
  
IEnumerable<XElement> allAncestors =  
    from el in greatGrandChildren.Ancestors("Child1")  
    select el;  
  
Console.WriteLine("");  
Console.WriteLine("Ancestors");  
Console.WriteLine("----");  
foreach (XElement de in allAncestors)  
    Console.WriteLine(de.Name);  
Dim xmlTree As XElement = _  
    <Root>  
        <Child1>  
            <GrandChild1>  
                <GreatGrandChild1>content</GreatGrandChild1>  
            </GrandChild1>  
        </Child1>  
        <Child2>  
            <GrandChild2>  
                <GreatGrandChild2>content</GreatGrandChild2>  
            </GrandChild2>  
        </Child2>  
    </Root>  
  
Dim greatGrandChildren = From el In xmlTree.Descendants _  
                         Where el.Name.LocalName.StartsWith("Great") _  
                         Select el  
  
Console.WriteLine("Great Grand Children Elements")  
Console.WriteLine("----")  
  
For Each de As XElement In greatGrandChildren  
    Console.WriteLine(de.Name)  
Next  
  
Dim allAncestors = From el In greatGrandChildren.Ancestors("Child1") _  
                   Select el  
  
Console.WriteLine("")  
Console.WriteLine("Ancestors")  
Console.WriteLine("----")  
  
For Each de As XElement In allAncestors  
    Console.WriteLine(de.Name)  
Next  
  

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

Great Grand Children Elements  
----  
GreatGrandChild1  
GreatGrandChild2  
  
Ancestors  
----  
Child1  

下列是相同的範例,但在此情況下,XML 是在命名空間中。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 Working with XML Namespaces.

XNamespace aw = "http://www.adventure-works.com";  
XElement xmlTree = new XElement(aw + "Root",  
    new XElement(aw + "Child1",  
        new XElement(aw + "GrandChild1",  
            new XElement(aw + "GreatGrandChild1", "content")  
        )  
    ),  
    new XElement(aw + "Child2",  
        new XElement(aw + "GrandChild2",  
            new XElement(aw + "GreatGrandChild2", "content")  
        )  
    )  
);  
IEnumerable<XElement> greatGrandChildren =  
    from el in xmlTree.Descendants()  
    where el.Name.LocalName.StartsWith("Great")  
    select el;  
  
Console.WriteLine("Great Grand Children Elements");  
Console.WriteLine("----");  
foreach (XElement de in greatGrandChildren)  
    Console.WriteLine(de.Name);  
  
IEnumerable<XElement> allAncestors =  
    from el in greatGrandChildren.Ancestors(aw + "Child1")  
    select el;  
  
Console.WriteLine("");  
Console.WriteLine("Ancestors");  
Console.WriteLine("----");  
foreach (XElement de in allAncestors)  
    Console.WriteLine(de.Name);  
Imports <xmlns="http://www.adventure-works.com">  
  
Module Module1  
    Sub Main()  
        Dim xmlTree As XElement = _  
            <Root>  
                <Child1>  
                    <GrandChild1>  
                        <GreatGrandChild1>content</GreatGrandChild1>  
                    </GrandChild1>  
                </Child1>  
                <Child2>  
                    <GrandChild2>  
                        <GreatGrandChild2>content</GreatGrandChild2>  
                    </GrandChild2>  
                </Child2>  
            </Root>  
  
        Dim greatGrandChildren = From el In xmlTree.Descendants _  
                                 Where el.Name.LocalName.StartsWith("Great") _  
                                 Select el  
  
        Console.WriteLine("Great Grand Children Elements")  
        Console.WriteLine("----")  
  
        For Each de As XElement In greatGrandChildren  
            Console.WriteLine(de.Name)  
        Next  
  
        Dim allAncestors = From el In greatGrandChildren.Ancestors(GetXmlNamespace() + "Child1") _  
                           Select el  
  
        Console.WriteLine("")  
        Console.WriteLine("Ancestors")  
        Console.WriteLine("----")  
  
        For Each de As XElement In allAncestors  
            Console.WriteLine(de.Name)  
        Next  
    End Sub  
End Module  
  

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

Great Grand Children Elements  
----  
{http://www.adventure-works.com}GreatGrandChild1  
{http://www.adventure-works.com}GreatGrandChild2  
  
Ancestors  
----  
{http://www.adventure-works.com}Child1  

備註

如果來源集合中的多個節點具有與相符XName的相同上階,則會在結果集合中多次包含上階。If multiple nodes in the source collection have the same ancestor with a matching XName, the ancestor will be included multiple times in the result 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