Writing Complicated Elements in .NET framework

Creation QR-Code in .NET framework Writing Complicated Elements

Writing Complicated Elements
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' VB myWriter.WriteStartElement("FirstNames") myWriter.WriteElementString("Name", "Libby") myWriter.WriteEndElement() // C# myWriter.WriteStartElement("FirstNames"); myWriter.WriteElementString("Name", "Libby"); myWriter.WriteEndElement();
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This code example creates the following output:
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<FirstNames> <Name>Libby</Name </FirstNames>
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Writing Attributes
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The WriteAttributeString method allows you to write attributes to the elements created with WriteStartElement. You can specify the name and the value for the attribute in the method. The following example demonstrates the use of the WriteAttributeString method.
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' VB myReader.WriteStartElement("FirstNames")
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Working with XML
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myReader.WriteAttributeString("Nicknames", "Ok") myWriter.WriteElementString("Name", "Libby") myReader.WriteEndElement() // C# myReader.WriteStartElement("FirstNames"); myReader.WriteAttributeString("Nicknames", "Ok"); myWriter.WriteElementString("Name", "Libby"); myReader.WriteEndElement(); This example generates the following output: <FirstNames Nicknames= Ok >
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<Name>Libby</Name>
</FirstNames>
Quick Check
1. Briefly describe the XmlReader class. 2. What are two classes that can be used to validate XML against a preexisting schema
Quick Check Answers
1. The XmlReader class provides rapid, forward-only access to data contained in an XML format. The XmlReader class can read strings, streams, or other forms of XML. 2. You can use both the XmlValidatingReader and the XmlReader classes to val idate XML against a schema. If XmlReader is used, you must configure it appropriately using an instance of XmlReaderSettings.
Lab: Create an Application that Reads an XML File
In this lab, you will create an application that reads an XML file and displays the ele ments, attributes, and text of that file.
Exercise 1: Reading XML into TreeView
In Visual Studio, create a new Windows Forms project. Then, follow these steps: 1. From the Toolbox, drag a TreeView, a Button, and an OpenFileDialog control onto the form.
Lesson 1: Reading and Writing XML with the XmlReader and XmlWriter Classes
2. Set the properties of the Form and controls as shown here: Control/Form Form1 Button1 OpenFileDialog1 Property Text Text Filter Value Read XML Read XML XML Files | *.xml
3. Right-click the Designer and then click View Code to open the code window. 4. In the code window, add the following line of code to the top of the code editor:
' VB Imports System.Xml // C# using System.Xml;
5. In the Designer, double-click Button1 to open the Button1_Click event handler. Add the following code to the Button1_Click event handler.
' VB ' Clears the Treeview control
TreeView1.Nodes.Clear()
' Creates a new XmlReader and reads the XML file found in the open file dialog box.
Dim aReader As XmlReader
OpenFileDialog1.ShowDialog()
If Not OpenFileDialog1.FileName = "" Then
aReader = XmlReader.Create(OpenFileDialog1.FileName)
End If
Dim aNode As TreeNode
Dim bNode As TreeNode
Dim parentNode As TreeNode
' Loops through the nodes of the XML file
While aReader.Read
Select Case aReader.NodeType ' If an element is found, it creates a new node, reads the ' attributes, and Adds the name of the element and the attributes ' As a new node to the Treeview Case XmlNodeType.Element aNode = New TreeNode(aReader.Name) If aReader.AttributeCount > 0 Then Dim i As Integer aReader.MoveToFirstAttribute() aNode.Text &= " " & aReader.Name & "=" & aReader.Value For i = 1 To aReader.AttributeCount 1 aReader.MoveToNextAttribute() aNode.Text &= " " & aReader.Name & "=" & aReader.Value Next End If
9
Working with XML
If parentNode Is Nothing Then TreeView1.Nodes.Add(aNode) Else parentNode.Nodes.Add(aNode) End If parentNode = aNode ' When an EndElement is encountered, the parent element is set one level up. Case XmlNodeType.EndElement parentNode = parentNode.Parent When a Text node is encountered, a new node is made As a child node containing the text is created Case XmlNodeType.Text bNode = New TreeNode(aReader.Value)
aNode.Nodes.Add(bNode)
Case Else
End Select
End While
// C# // Clears the Treeview control
treeView1.Nodes.Clear();
// Creates a new XmlReader and reads the XML file found in the open file dialog box.
XmlReader aReader;
openFileDialog1.ShowDialog();
aReader = XmlReader.Create(openFileDialog1.FileName);
TreeNode aNode = new TreeNode();
TreeNode bNode;
TreeNode parentNode = new TreeNode();
// Loops through the nodes of the XML file
while (aReader.Read())
switch (aReader.NodeType) { // If an element is found, it creates a new node, reads the // attributes, and Adds the name of the element and the attributes // as a new node to the Treeview case XmlNodeType.Element: aNode = new TreeNode(aReader.Name); if (aReader.AttributeCount > 0) { aReader.MoveToFirstAttribute();
aNode.Text += " " + aReader.Name + "=" + aReader.Value;
for (int i = 1; i < aReader.AttributeCount; i++)
aReader.MoveToNextAttribute();
aNode.Text += " " + aReader.Name + "=" + aReader.Value;
} } if (parentNode.Text == "") treeView1.Nodes.Add(aNode); else parentNode.Nodes.Add(aNode); parentNode = aNode;
Lesson 1: Reading and Writing XML with the XmlReader and XmlWriter Classes
// When an EndElement is encountered, the parent element is set one level up. break; case XmlNodeType.EndElement: parentNode = parentNode.Parent; break; // When a Text node is encountered, a new node is made as a child // node containing the text is created case XmlNodeType.Text: bNode = new TreeNode(aReader.Value);
aNode.Nodes.Add(bNode);
break;
6. Press F5 to run the application. Click the button marked Read XML and navigate to an XML file such as Bookstore.Xml in the where location on your disk. Note that the XML file is read and the nodes are translated into TreeView.
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