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After you ve loaded XML data into an XmlDocument object, you might want to explore all the nodes it contains. The two main entry points for exploring the DOM hierarchy are the Children collection of the XmlDocument itself, which lets you discover any XML declaration, processing instruction, and comment at the top level of the docu ment; and the XmlDocument s DocumentElement property, which jumps directly to the main XML element that contains the real data:

The following code shows how you can load an XML file into an XmlDocument object and then traverse the DOM hierarchy and display the data in a TreeView control. (See Figure 23-2.) Not surprisingly, the core routine is a recursive procedure that adds an element to the Nodes collection of the TreeView and then calls itself over all the child nodes of the current XmlNode object. You can iterate over all the child nodes of an XmlNode object in either of two ways: by indexing the ChildNodes collection or by

Documents\Microsoft Press\SBS_Publisher2007\VisualInterest folder, and doubleclick the Birthday at the Ritz picture. Publisher inserts the picture in the frame you drew on the page and displays the Picture toolbar.

Part V:

Dim xmldoc As New XmlDocument()

The KillerSprite class must have one random number generator which is shared among all instances of the class. If the program made a new random number generator each time it made a new KillerSprite instance this would not work. All the sprites would be placed in the same location because they would each contain a brand-new random number generator seeded with the value 1. They would then set their positions by using the same first two numbers produced by the identically seeded generator. You can get around this problem by making the random number generator a static member of the class. When a class member is made static it is not held inside an instance, but is actually part of the class, and shared by all the instances.

xmldoc.Load( employees.xml )

Dim xmlEl As XmlElement = xmldoc.CreateElement( Employee )

Append it to the children collection of the DOM root element. xmldoc.DocumentElement.AppendChild(xmlEl) Set the id attribute of the new element. xmlEl.SetAttribute( id", 100 ) Create all its subelements. (Each subelement is created with a different technique.) Dim xmlChildEl As XmlElement This is the firstName subelement.

2

xmlChildEl = xmldoc.CreateElement( firstName )

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static Random rand = new Random(1);

Dim xmlText As XmlText = xmldoc.CreateTextNode( Joe ) xmlChildEl.AppendChild(xmlText) Append the firstName element to the new Employee element.

xmlEl.AppendChild(xmlChildEl)

16. If necessary, move the Picture toolbar out of the way. Then drag the lower-right handle of the frame down and to the right until the picture lls the width of the page.

xmlChildEl = xmldoc.CreateElement( lastName )

xmlChildEl.AppendChild(xmldoc.CreateTextNode( Doe ))

Whenever an instance of KillerSprite uses the rand member variable, it will use the single, static variable which is part of the class. You first saw static class members in 11 in the section Static Classes and Methods, where you saw how useful it can be to make methods static so that they can be called without needing to create an instance of a class. This is a situation where you want a particular data item to be shared among class members. The KillerSprite constructor uses the random number generator to position a sprite at a random position, as shown here in bold:

xmlEl.AppendChild(xmlChildEl)

xmlChildEl = xmldoc.CreateElement( address )

This time we use the InnerText property (a Microsoft extension of WC3 DOM).

19. Click the Crop button to hide the cropping handles. 20. With the picture still selected, on the Picture toolbar, click the Line/Border Style

xmlChildEl.InnerText = 1234 North Street"

public class KillerSprite : MovingSprite { static Random rand = new Random(1); public KillerSprite( Texture2D inSpriteTexture, float widthFactor, float ticksToCrossScreen, float inMinDisplayX, float inMaxDisplayX, float inMinDisplayY, float inMaxDisplayY) : base(inSpriteTexture, widthFactor, ticksToCrossScreen, inMinDisplayX, inMaxDisplayX, inMinDisplayY, inMaxDisplayY, 0, 0) // set the initial position to 0,0 for now { initialX = rand.Next((int)minDisplayX, (int)(maxDisplayX - spriteRectangle.Width)); initialY = rand.Next((int)minDisplayY, (int)(maxDisplayY - spriteRectangle.Height)); } }

xmlEl.AppendChild(xmlChildEl)

xmlChildEl = xmldoc.CreateElement( city )

xmlChildEl.InnerText = Boston"

xmlEl.AppendChild(xmlChildEl)

button, and in the list, click the 3 pt line. Then click a blank area of the page to see the results.

xmldoc.Save( employees2.xml )

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To make your code even more concise, you can prepare a helper routine for creating subelements and their inner text and append them to a parent element as one operation: