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

Definição

Retorna uma coleção de elementos que contém os ancestrais de cada nó na coleção de origem.Returns a collection of elements that contains the ancestors of every node in the source collection.

Sobrecargas

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

Retorna uma coleção de elementos que contém os ancestrais de cada nó na coleção de origem.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)

Retorna uma coleção filtrada de elementos que contém os ancestrais de cada nó na coleção de origem.Returns a filtered collection of elements that contains the ancestors of every node in the source collection. Somente os elementos que têm um XName correspondente são incluídos na coleção.Only elements that have a matching XName are included in the collection.

Comentários

Se vários nós na coleção de origem tiverem o mesmo ancestral, o ancestral será incluído várias vezes na coleção de resultados.If multiple nodes in the source collection have the same ancestor, the ancestor will be included multiple times in the result collection. Para evitar isso, use o Distinct método.To avoid this, use the Distinct method.

Este método utiliza execução adiada.This method uses deferred execution.

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

Retorna uma coleção de elementos que contém os ancestrais de cada nó na coleção de origem.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)

Parâmetros de tipo

T

O tipo dos objetos em source, restritos para XNode.The type of the objects in source, constrained to XNode.

Parâmetros

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

Um IEnumerable<T> do XNode que contém a coleção de origem.An IEnumerable<T> of XNode that contains the source collection.

Retornos

Um IEnumerable<T> de XElement que contém os ancestrais de cada nó na coleção de origem.An IEnumerable<T> of XElement that contains the ancestors of every node in the source collection.

Exemplos

O exemplo a seguir recupera uma coleção dos ótimos elementos netos.The following example retrieves a collection of the great grandchildren elements. Em seguida, ele usa esse método Axis para recuperar todos os ancestrais de todos os elementos na coleção.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  

Este exemplo gera a seguinte saída:This example produces the following output:

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

O exemplo a seguir é o mesmo, mas, nesse caso, o XML está em um namespace.The following is the same example, but in this case the XML is in a namespace. Para obter mais informações, consulte trabalhando com namespaces XML.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  

Este exemplo gera a seguinte saída: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  

Comentários

Se vários nós na coleção de origem tiverem o mesmo ancestral, o ancestral será incluído várias vezes na coleção de resultados.If multiple nodes in the source collection have the same ancestor, the ancestor will be included multiple times in the result collection. Para evitar isso, use o Distinct método.To avoid this, use the Distinct method.

Este método utiliza execução adiada.This method uses deferred execution.

Veja também

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

Retorna uma coleção filtrada de elementos que contém os ancestrais de cada nó na coleção de origem.Returns a filtered collection of elements that contains the ancestors of every node in the source collection. Somente os elementos que têm um XName correspondente são incluídos na coleção.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)

Parâmetros de tipo

T

O tipo dos objetos em source, restritos para XNode.The type of the objects in source, constrained to XNode.

Parâmetros

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

Um IEnumerable<T> do XNode que contém a coleção de origem.An IEnumerable<T> of XNode that contains the source collection.

name
XName XName XName XName

O XName correspondente.The XName to match.

Retornos

Um IEnumerable<T> de XElement que contém os ancestrais de cada nó na coleção de origem.An IEnumerable<T> of XElement that contains the ancestors of every node in the source collection. Somente os elementos que têm um XName correspondente são incluídos na coleção.Only elements that have a matching XName are included in the collection.

Exemplos

O exemplo a seguir recupera uma coleção dos ótimos elementos netos.The following example retrieves a collection of the great grandchildren elements. Em seguida, ele usa esse método Axis para recuperar todos os ancestrais de todos os elementos na coleção que XNamecorrespondem a um especificado.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  
  

Este exemplo gera a seguinte saída:This example produces the following output:

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

O exemplo a seguir é o mesmo, mas, nesse caso, o XML está em um namespace.The following is the same example, but in this case the XML is in a namespace. Para obter mais informações, consulte trabalhando com namespaces XML.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  
  

Este exemplo gera a seguinte saída: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  

Comentários

Se vários nós na coleção de origem tiverem o mesmo ancestral com uma correspondência XName, o ancestral será incluído várias vezes na coleção de resultados.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.

Este método utiliza execução adiada.This method uses deferred execution.

Veja também

Aplica-se a