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Extensions.AncestorsAndSelf Method

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Definition

Namespace:
System.Xml.Linq
Assembly:
System.Xml.XDocument.dll
Assembly:
System.Xml.Linq.dll
Assembly:
netstandard.dll

Returns a collection of elements that contains every element in the source collection, and the ancestors of every element in the source collection.

Overloads

AncestorsAndSelf(IEnumerable<XElement>)

Returns a collection of elements that contains every element in the source collection, and the ancestors of every element in the source collection.
AncestorsAndSelf(IEnumerable<XElement>, XName)

Returns a filtered collection of elements that contains every element in the source collection, and the ancestors of every element in the source collection. Only elements that have a matching XName are included in the collection.

Remarks

If multiple nodes in the source collection have the same ancestor, the ancestor will be included multiple times in the result collection. To avoid this, use the Distinct method.

This method uses deferred execution.

AncestorsAndSelf(IEnumerable<XElement>)

Source:
Extensions.cs
Source:
Extensions.cs
Source:
Extensions.cs

Returns a collection of elements that contains every element in the source collection, and the ancestors of every element in the source collection.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ AncestorsAndSelf(System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ source);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> AncestorsAndSelf (this System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> source);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> AncestorsAndSelf (this System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement?> source);
static member AncestorsAndSelf : seq<System.Xml.Linq.XElement> -> seq<System.Xml.Linq.XElement>
<Extension()>
Public Function AncestorsAndSelf (source As IEnumerable(Of XElement)) As IEnumerable(Of XElement)

Parameters

source
IEnumerable<XElement>

An IEnumerable<T> of XElement that contains the source collection.

Returns

IEnumerable<XElement>

An IEnumerable<T> of XElement that contains every element in the source collection, and the ancestors of every element in the source collection.

Examples

The following example retrieves a collection of the great grandchildren elements. It then uses this axis method to retrieve all ancestors and self 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.AncestorsAndSelf().Distinct()  
    select el;  

Console.WriteLine("");  
Console.WriteLine("Ancestors and Self");  
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.AncestorsAndSelf.Distinct _  
                   Select el  

Console.WriteLine("")  
Console.WriteLine("Ancestors and Self")  
Console.WriteLine("----")  

For Each de As XElement In allAncestors  
    Console.WriteLine(de.Name)  
Next

This example produces the following output:

Great Grand Children Elements  
----  
GreatGrandChild1  
GreatGrandChild2  

Ancestors and Self  
----  
GreatGrandChild1  
GrandChild1  
Child1  
Root  
GreatGrandChild2  
GrandChild2  
Child2

The following is the same example, but in this case the XML is in a namespace. For more information, see Work 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.AncestorsAndSelf().Distinct()  
    select el;  

Console.WriteLine("");  
Console.WriteLine("Ancestors and Self");  
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.AncestorsAndSelf.Distinct _  
                           Select el  

        Console.WriteLine("")  
        Console.WriteLine("Ancestors and Self")  
        Console.WriteLine("----")  

        For Each de As XElement In allAncestors  
            Console.WriteLine(de.Name)  
        Next  
    End Sub  
End Module

This example produces the following output:

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

Ancestors and Self  
----  
{http://www.adventure-works.com}GreatGrandChild1  
{http://www.adventure-works.com}GrandChild1  
{http://www.adventure-works.com}Child1  
{http://www.adventure-works.com}Root  
{http://www.adventure-works.com}GreatGrandChild2  
{http://www.adventure-works.com}GrandChild2  
{http://www.adventure-works.com}Child2

Remarks

If multiple nodes in the source collection have the same ancestor, the ancestor will be included multiple times in the result collection. To avoid this, use the Distinct method.

This method uses deferred execution.

See also

Applies to

AncestorsAndSelf(IEnumerable<XElement>, XName)

Source:
Extensions.cs
Source:
Extensions.cs
Source:
Extensions.cs

Returns a filtered collection of elements that contains every element in the source collection, and the ancestors of every element in the source collection. Only elements that have a matching XName are included in the collection.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ AncestorsAndSelf(System::Collections::Generic::IEnumerable<System::Xml::Linq::XElement ^> ^ source, System::Xml::Linq::XName ^ name);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> AncestorsAndSelf (this System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> source, System.Xml.Linq.XName name);
public static System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement> AncestorsAndSelf (this System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement?> source, System.Xml.Linq.XName? name);
static member AncestorsAndSelf : seq<System.Xml.Linq.XElement> * System.Xml.Linq.XName -> seq<System.Xml.Linq.XElement>
<Extension()>
Public Function AncestorsAndSelf (source As IEnumerable(Of XElement), name As XName) As IEnumerable(Of XElement)

Parameters

source
IEnumerable<XElement>

An IEnumerable<T> of XElement that contains the source collection.

name
XName

The XName to match.

Returns

IEnumerable<XElement>

An IEnumerable<T> of XElement that contains every element in the source collection, and the ancestors of every element in the source collection. Only elements that have a matching XName are included in the collection.

Examples

The following example retrieves a collection of the great grandchildren elements. It then uses this axis method to retrieve all self and 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.AncestorsAndSelf("GreatGrandChild1")  
    select el;  

Console.WriteLine("");  
Console.WriteLine("Ancestors and Self");  
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.AncestorsAndSelf("GreatGrandChild1") _  
                   Select el  

Console.WriteLine("")  
Console.WriteLine("Ancestors and Self")  
Console.WriteLine("----")  

For Each de As XElement In allAncestors  
    Console.WriteLine(de.Name)  
Next

This example produces the following output:

Great Grand Children Elements  
----  
GreatGrandChild1  
GreatGrandChild2  

Ancestors and Self  
----  
GreatGrandChild1

The following is the same example, but in this case the XML is in a namespace. For more information, see Work 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.AncestorsAndSelf(aw + "GreatGrandChild1")  
    select el;  

Console.WriteLine("");  
Console.WriteLine("Ancestors and Self");  
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.AncestorsAndSelf(GetXmlNamespace() + "GreatGrandChild1") _  
                           Select el  

        Console.WriteLine("")  
        Console.WriteLine("Ancestors and Self")  
        Console.WriteLine("----")  

        For Each de As XElement In allAncestors  
            Console.WriteLine(de.Name)  
        Next  
    End Sub  
End Module

This example produces the following output:

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

Ancestors and Self  
----  
{http://www.adventure-works.com}GreatGrandChild1

Remarks

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.

This method uses deferred execution.

See also

Applies to