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XDocument Class

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Represents an XML document.

System.Object
  System.Xml.Linq.XObject
    System.Xml.Linq.XNode
      System.Xml.Linq.XContainer
        System.Xml.Linq.XDocument

Namespace: System.Xml.Linq
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)

Syntax

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public class XDocument : XContainer

The XDocument type exposes the following members.

Constructors

	Name	Description
	XDocument()	Initializes a new instance of the XDocument class.
	XDocument(Object[])	Initializes a new instance of the XDocument class with the specified content.
	XDocument(XDocument)	Initializes a new instance of the XDocument class from an existing XDocument object.
	XDocument(XDeclaration, Object[])	Initializes a new instance of the XDocument class with the specified XDeclaration and content.

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Properties

	Name	Description
	BaseUri	Gets the base URI for this XObject. (Inherited from XObject.)
	Declaration	Gets or sets the XML declaration for this document.
	Document	Gets the XDocument for this XObject. (Inherited from XObject.)
	DocumentType	Gets the Document Type Definition (DTD) for this document.
	FirstNode	Get the first child node of this node. (Inherited from XContainer.)
	LastNode	Get the last child node of this node. (Inherited from XContainer.)
	NextNode	Gets the next sibling node of this node. (Inherited from XNode.)
	NodeType	Gets the node type for this node. (Overrides XObject.NodeType.)
	Parent	Gets the parent XElement of this XObject. (Inherited from XObject.)
	PreviousNode	Gets the previous sibling node of this node. (Inherited from XNode.)
	Root	Gets the root element of the XML Tree for this document.

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Methods

	Name	Description
	Add(Object)	Adds the specified content as children of this XContainer. (Inherited from XContainer.)
	Add(Object[])	Adds the specified content as children of this XContainer. (Inherited from XContainer.)
	AddAfterSelf(Object)	Adds the specified content immediately after this node. (Inherited from XNode.)
	AddAfterSelf(Object[])	Adds the specified content immediately after this node. (Inherited from XNode.)
	AddAnnotation	Adds an object to the annotation list of this XObject. (Inherited from XObject.)
	AddBeforeSelf(Object)	Adds the specified content immediately before this node. (Inherited from XNode.)
	AddBeforeSelf(Object[])	Adds the specified content immediately before this node. (Inherited from XNode.)
	AddFirst(Object)	Adds the specified content as the first children of this document or element. (Inherited from XContainer.)
	AddFirst(Object[])	Adds the specified content as the first children of this document or element. (Inherited from XContainer.)
	Ancestors()	Returns a collection of the ancestor elements of this node. (Inherited from XNode.)
	Ancestors(XName)	Returns a filtered collection of the ancestor elements of this node. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
	Annotation(Type)	Gets the first annotation object of the specified type from this XObject. (Inherited from XObject.)
	Annotation<T>()	Get the first annotation object of the specified type from this XObject. (Inherited from XObject.)
	Annotations(Type)	Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.)
	Annotations<T>()	Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.)
	CreateReader()	Creates an XmlReader for this node. (Inherited from XNode.)
	CreateReader(ReaderOptions)	Creates an XmlReader for this node. (Inherited from XNode.)
	CreateWriter	Creates an XmlWriter that can be used to add nodes to the XContainer. (Inherited from XContainer.)
	DescendantNodes	Returns a collection of the descendant nodes for this document or element, in document order. (Inherited from XContainer.)
	Descendants()	Returns a collection of the descendant elements for this document or element, in document order. (Inherited from XContainer.)
	Descendants(XName)	Returns a filtered collection of the descendant elements for this document or element, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XContainer.)
	Element	Gets the first (in document order) child element with the specified XName. (Inherited from XContainer.)
	Elements()	Returns a collection of the child elements of this element or document, in document order. (Inherited from XContainer.)
	Elements(XName)	Returns a filtered collection of the child elements of this element or document, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XContainer.)
	ElementsAfterSelf()	Returns a collection of the sibling elements after this node, in document order. (Inherited from XNode.)
	ElementsAfterSelf(XName)	Returns a filtered collection of the sibling elements after this node, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
	ElementsBeforeSelf()	Returns a collection of the sibling elements before this node, in document order. (Inherited from XNode.)
	ElementsBeforeSelf(XName)	Returns a filtered collection of the sibling elements before this node, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsAfter	Determines if the current node appears after a specified node in terms of document order. (Inherited from XNode.)
	IsBefore	Determines if the current node appears before a specified node in terms of document order. (Inherited from XNode.)
	Load(Stream)	Creates a new XDocument instance using the specified stream.
	Load(String)	Creates a new XDocument from a file located in the application's XAP package.
	Load(TextReader)	Creates a new XDocument from a TextReader.
	Load(XmlReader)	Creates a new XDocument from an XmlReader.
	Load(Stream, LoadOptions)	Creates a new XDocument instance using the specified stream, optionally preserving white space, setting the base URI, and retaining line information.
	Load(String, LoadOptions)	Creates a new XDocument from a file located in the application's XAP package, optionally preserving white space, setting the base URI, and retaining line information.
	Load(TextReader, LoadOptions)	Creates a new XDocument from a TextReader, optionally preserving white space, setting the base URI, and retaining line information.
	Load(XmlReader, LoadOptions)	Creates a new XDocument from an XmlReader, optionally setting the base URI, and retaining line information.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	Nodes	Returns a collection of the child nodes of this element or document, in document order. (Inherited from XContainer.)
	NodesAfterSelf	Returns a collection of the sibling nodes after this node, in document order. (Inherited from XNode.)
	NodesBeforeSelf	Returns a collection of the sibling nodes before this node, in document order. (Inherited from XNode.)
	Parse(String)	Creates a new XDocument from a string.
	Parse(String, LoadOptions)	Creates a new XDocument from a string, optionally preserving white space, setting the base URI, and retaining line information.
	Remove	Removes this node from its parent. (Inherited from XNode.)
	RemoveAnnotations(Type)	Removes the annotations of the specified type from this XObject. (Inherited from XObject.)
	RemoveAnnotations<T>()	Removes the annotations of the specified type from this XObject. (Inherited from XObject.)
	RemoveNodes	Removes the child nodes from this document or element. (Inherited from XContainer.)
	ReplaceNodes(Object)	Replaces the children nodes of this document or element with the specified content. (Inherited from XContainer.)
	ReplaceNodes(Object[])	Replaces the children nodes of this document or element with the specified content. (Inherited from XContainer.)
	ReplaceWith(Object)	Replaces this node with the specified content. (Inherited from XNode.)
	ReplaceWith(Object[])	Replaces this node with the specified content. (Inherited from XNode.)
	Save(Stream)	Outputs this XDocument to the specified Stream.
	Save(TextWriter)	Serialize this XDocument to a TextWriter.
	Save(XmlWriter)	Serialize this XDocument to an XmlWriter.
	Save(Stream, SaveOptions)	Outputs this XDocument to the specified Stream, optionally specifying formatting behavior.
	Save(TextWriter, SaveOptions)	Serialize this XDocument to a TextWriter, optionally disabling formatting.
	ToString()	Returns the indented XML for this node. (Inherited from XNode.)
	ToString(SaveOptions)	Returns the XML for this node, optionally disabling formatting. (Inherited from XNode.)
	WriteTo	Write this document to an XmlWriter. (Overrides XNode.WriteTo(XmlWriter).)

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Events

	Name	Description
	Changed	Raised when this XObject or any of its descendants have changed. (Inherited from XObject.)
	Changing	Raised when this XObject or any of its descendants are about to change. (Inherited from XObject.)

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Extension Methods

	Name	Description
	CreateNavigator()	Overloaded. Creates an XPathNavigator for an XNode. (Defined by Extensions.)
	CreateNavigator(XmlNameTable)	Overloaded. Creates an XPathNavigator for an XNode. The XmlNameTable enables more efficient XPath expression processing. (Defined by Extensions.)
	XPathEvaluate(String)	Overloaded. Evaluates an XPath expression. (Defined by Extensions.)
	XPathEvaluate(String, IXmlNamespaceResolver)	Overloaded. Evaluates an XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
	XPathSelectElement(String)	Overloaded. Selects an XElement using a XPath expression. (Defined by Extensions.)
	XPathSelectElement(String, IXmlNamespaceResolver)	Overloaded. Selects an XElement using a XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
	XPathSelectElements(String)	Overloaded. Selects a collection of elements using an XPath expression. (Defined by Extensions.)
	XPathSelectElements(String, IXmlNamespaceResolver)	Overloaded. Selects a collection of elements using an XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)

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Explicit Interface Implementations

	Name	Description
	IXmlLineInfo.HasLineInfo	Gets a value indicating whether or not this XObject has line information. (Inherited from XObject.)
	IXmlLineInfo.LineNumber	Gets the line number that the underlying XmlReader reported for this XObject. (Inherited from XObject.)
	IXmlLineInfo.LinePosition	Gets the line position that the underlying XmlReader reported for this XObject. (Inherited from XObject.)

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Remarks

For more information about the valid content of an XDocument, see Valid Content of XElement and XDocument Objects in the .NET Framework documentation.

Examples

The following example creates a document, and then adds a comment and an element to it. It then composes another document using the results of a query.

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StringBuilder output = new StringBuilder();
XDocument srcTree = new XDocument(
    new XComment("This is a comment"),
    new XElement("Root",
        new XElement("Child1", "data1"),
        new XElement("Child2", "data2"),
        new XElement("Child3", "data3"),
        new XElement("Child2", "data4"),
        new XElement("Info5", "info5"),
        new XElement("Info6", "info6"),
        new XElement("Info7", "info7"),
        new XElement("Info8", "info8")
    )
);

XDocument doc = new XDocument(
    new XComment("This is a comment"),
    new XElement("Root",
        from el in srcTree.Element("Root").Elements()
        where ((string)el).StartsWith("data")
        select el
    )
);
output.Append(doc + Environment.NewLine);

OutputTextBlock.Text = output.ToString();