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ReadInnerXml and ReadOuterXml
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You can use the ReadInnerXml and ReadOuterXml methods to return portions of the XML file as strings. The ReadInnerXml method returns the contents of the current XML node, including child nodes but excluding the opening and closing nodes them selves. The ReadOuterXml method returns the contents of the current XML node, including child nodes as well as the opening and closing nodes. For example, con sider the following XML fragment:
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<text1>mytext<subtext1>mysubtext</subtext1></text1><text2></text2>
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If XmlReader is positioned on <text1>, ReadInnerXml returns the following string:
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mytext<subtext1>mysubtext</subtext1>
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and moves the position of XmlReader to <text2>. Given the same XML fragment, ReadOuterXml returns the following string:
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<text1>mytext<subtext1>mysubtext</subtext1></text1>
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and moves the reader position to <text2>.
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Lesson 1: Reading and Writing XML with the XmlReader and XmlWriter Classes
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If XmlReader has been positioned on an attribute, you can use ReadInnerXml and ReadOuterXml to return strings based on the attribute content. For example, consider the following XML fragment:
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Reading Attributes with ReadInnerXml and ReadOuterXml
<text1 length="12" color="blue">moo</text1>
If the XmlReader is positioned on the length attribute, ReadInnerXml returns the fol lowing string:
and does not advance the position of the reader. Likewise, given the same fragment and starting position, ReadOuterXml returns the following string:
length="12"
Again, the position of the reader is not changed.
MoveToContent
You can use the MoveToContent method to skip over nodes that do not contain con tent, such as white space, comments, or processing instructions. The MoveToContent method checks to see if the current node is a content node. If it is, no action is taken. If the current node is not a content node, it moves the position of the reader to the next content-containing node. MoveToContent considers the following node types to be content nodes: CDATA, Element, EndElement, EntityReference, EndEntity, or any nonwhite space text. When MoveToContent is called, the reader will stop at the first of any of these nodes that it encounters. It will skip over any of the following types of nodes: ProcessingInstruction, DocumentType, Comment, Whitespace, or SignificantWhitespace. The following demonstrates how to call MoveToContent:
' VB ' Assumes an XmlReader named myReader myReader.MoveToContent() // C# // Assumes an XmlReader named myReader myReader.MoveToContent();
9
Working with XML
Skip
Calling the Skip method causes XmlReader to skip all of the child nodes of the current node and proceed to the next node at the same level. For example, consider the fol lowing XML fragment:
<text1>
<text2>
</text2>
</text1>
<text3>
</text3>
If the reader is positioned on <text1> and the Skip method is called, the reader is advanced to the <text3> node. The following example demonstrates the use of the Skip method:
' VB myReader.Skip() // C# myReader.Skip();
The XmlTextReader Class
The XmlTextReader class is an implementation of the XmlReader class. You can use all of the methods previously described in this lesson for the XmlReader class for the XmlTextReader class as well. The XmlTextReader is designed to read text either in a file or in a stream. You can create an XmlTextReader object that will read a specific stream or file by specifying the appropriate stream or file at instantiation, as shown in the fol lowing code:
' VB Dim aReader As XmlTextReader
' Creates an XmlTextReader that reads a stream called XmlStream
aReader = New XmlTextReader(XmlStream)
' Creates a reader that reads a file located at C:\SampleXml.xml
aReader = New XmlTextReader("C:\SampleXml.xml")
// C# XmlTextReader aReader;
// Creates an XmlTextReader that reads a stream called XmlStream
aReader = new XmlTextReader(XmlStream);
// Creates a reader that reads a file located at C:\SampleXml.xml
aReader = new XmlTextReader( C:\\SampleXml.xml );
Lesson 1: Reading and Writing XML with the XmlReader and XmlWriter Classes
XmlNodeReader
XmlNodeReader is another derivative class of XmlReader and is designed to read the XML content of an XmlNode object, which is generally part of an XML data object model (DOM) subtree. You can create an XmlNodeReader by specifying the appropri ate XmlNode, as shown here:
' VB Dim aReader As XmlNodeReader ' Creates an XmlNodeReader that reads an XmlNode named Node aReader = New XmlNodeReader(Node) // C# XmlNodeReader aReader;
// Creates an XmlNodeReader that reads an XmlNode named Node
aReader = new XmlNodeReader(Node);
Validating XML with XmlValidatingReader
The XmlValidatingReader allows you to validate XML against a given schema. As the document is read, it is checked for validity against the schema that are indicated. XmlValidatingReader wraps an existing XmlReader instance. You can create an XmlValidatingReader instance, as shown here:
' VB ' Assumes the existence of an XmlReader named aReader Dim aValReader As XmlValidatingReader aValReader = New XmlValidatingReader(aReader) // C# // Assumes the existence of an XmlReader named aReader
XmlValidatingReader aValReader;
aValReader = new XmlValidatingReader(aReader);
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