Changing the Value of Existing Nodes in Visual Studio .NET

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Changing the Value of Existing Nodes
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' VB Dim aText As New Xml.XmlText("Text1")
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' Changes the value of the text element to 'Text2'
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aText.Value = "Text2"
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// C# Xml.XmlText aText = new Xml.XmlText("Text1"); // Changes the value of the text element to 'Text2' aText.Value = "Text2";
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Replacing an Entire Set of Child Nodes If you want to replace all of the child nodes of
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one node with another set of nodes, you can do so by setting the XmlNode.InnerXml property. The InnerXml property of an XmlNode is a string that contains all content and child nodes of the node but excludes the starting and ending elements. By setting the InnerXml property, you can replace the existing child nodes with a string that con tains your new child nodes. Here is an example:
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' VB ' Assumes an XmlNode called aNode Dim aString As String = "<Test>TestChildNodes</Test>" aNode.InnerXml = aString // C# // Assumes an XmlNode called aNode String aString = "<Test>TestChildNodes</Test>' aNode.InnerXml = aString;
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Replacing Specific Nodes
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You can replace individual nodes by using the XmlNode.ReplaceChild method. This method allows you to specify a child node of your XmlNode and to specify an XmlNode to replace it with. The following example shows how to use the ReplaceChild method.
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' VB ' This example replaces the child node named OldNode with the node named
9
Working with XML
' NewNode. The parent node in this example is called aNode.
aNode.ReplaceChild(NewNode, OldNode)
// C# // This example replaces the child node named OldNode with the node named // NewNode. The parent node in this example is called aNode. aNode.ReplaceChild(NewNode, OldNode);
Replacing or Removing a Range of Characters For nodes that inherit from the XmlCharacterData class (these are XmlCDataSection, XmlComment, XmlSignificantWhitespace, XmlText, and XmlWhitespace) you can replace or remove characters using the ReplaceData method, which takes three parameters. The first parameter is the starting character in the existing character data to replace. The second parameter is the length of the characters to be replaced. The third parameter is a string that will be inserted into the character data at the point specified. The following example demon strates the ReplaceData method.
' VB Dim aText As New XmlText("myText")
aText.ReplaceData(0, 2, "your")
' The resulting value of aText is 'yourText'
// C# XmlText aText = new XmlText("myText");
aText.ReplaceData(0, 2, "your");
// The resulting value of aText is 'yourText'
Setting or Updating an Attribute
You can add an attribute to an element or update the value of an existing attribute by using the SetAttribute method, as shown here:
' VB anElement.SetAttribute("Color", "Blue") // C# anElement.SetAttribute("Color", "Blue");
The code shown in this example sets the Color attribute of anElement to Blue. If anEle ment does not have a Color attribute, it creates a new Color attribute and sets the value to Blue.
Writing XML with XmlDocument
You can write the content of an XmlDocument to a file, stream, console, or other out put format with the XmlDocument.WriteTo method. This method writes all of the nodes in the XmlDocument to a specified XmlWriter. This is functionally equivalent to writing the OuterXml property. You can also write the content of the XmlDocument
Lesson 2: Managing XML with the XML Document Object Model
excluding the opening and closing nodes with the WriteContentTo method. This is functionally equivalent to writing the InnerXml property. The following example dem onstrates how to write the nodes of an XmlDocument named aDocument to a file called myFile.xml.
' VB Dim aWriter As Xml.XmlWriter
aWriter = Xml.XmlWriter.Create("myFile.xml")
aDocument.WriteTo(aWriter)
// C# XmlWriter aWriter;
aWriter = Xml.XmlWriter.Create("myFile.xml");
aDocument.WriteTo(aWriter);
Working with XmlNamedNodeMap
The XmlNamedNodeMap organizes a collection of non-hierarchical XML nodes such as attributes or entities. The following three properties return an XmlNamedNodeMap:
XmlElement.Attributes XmlDocumentType.Entities XmlDocumentType.Notations
The XmlNamedNodeMap class allows access to XmlNodes by the name of the node. Table 9-11 describes the important methods of the XmlNamedNodeMap.
Table 9-11 Important Methods of the XmlNamedNodeMap
Method GetNamedItem Item RemoveNamedItem SetNamedItem
Description Retrieves the XmlNode with the specified name Retrieves the node with the specified index Removes the specified node from the XmlNamedNodeMap Adds an existing XmlNode to the XmlNamedNodeMap
Working with XmlNodeList
The XmlNodeList class represents an ordered list of nodes. The following methods and properties return an XmlNodeList.
XmlNode.ChildNodes
9
Working with XML
XmlDocument.GetElementsByTagName XmlElement.GetElementsByTagName XmlNode.SelectNodes
The XmlNodeList class allows access to the nodes contained in it by the index of the node through the Item method. The Count property returns the number of nodes in the XmlNodeList. The following code example demonstrates how to loop through each node in an XmlNodeList named xList.
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