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MoveToNextAttribute() moves to the next attribute of the current node. MoveToParent() moves to the parent of the current node. MoveToPrevious() moves to the previous sibling of the current node. MoveToRoot() moves to the root node of the current node. Select() selects a collection of nodes that match an XPath expression. SelectAncestor() selects a collection of ancestor nodes that match an XPath expression. SelectChildren() selects a collection of children nodes that match an XPath expression. SelectDescendants() selects a collection of descendant nodes that match an XPath expression. ValueAs() returns the current node value as the type specified. As you can see by the list of methods made available by XPathNavigator, it does what its name suggests: navigates. The majority of the methods are for navigating forward, backward, and, as you will see when you add XPath expressions, randomly through the DOM tree.

s Note If User B looks in the Source Control Explorer, he or she would notice that the latest version (the

s Note You can remove any binding using the ClearBinding() and ClearAllBindings() methods. It doesn t

Let s first look at the XPathNavigator class without the XPath functionality or simply its capability to move around a DOM tree. The example in Listing 13-12 is your third and final read through the monster XML file. This time you are going to use XPathNavigator. Listing 13-12. Navigating a DOM Tree Using XPathNavigator using namespace System; using namespace System::Xml; using namespace System::Xml::XPath; String ^indent(int depth) { String ^ind = ""; return ind->PadLeft(depth*4, ' '); } void Navigate(XPathNavigator ^nav, int depth) { Console::WriteLine("{0}: Name='{1}' Value='{2}'", String::Concat(indent(depth), nav->NodeType.ToString()), nav->Name, nav->Value); if (nav->HasAttributes) { nav->MoveToFirstAttribute(); do { Console::WriteLine("{0} Attribute: Name='{1}' Value='{2}'", indent(depth+1),nav->Name, nav->Value); } while(nav->MoveToNextAttribute()); nav->MoveToParent(); }

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Creating custom controls. To make it easier for other people to modify the visual appearance of a custom control you build, you ll need to move certain details (such as event handlers and data binding expressions) into your code and out of your markup. 24 includes a custom color picking control that uses code to create its bindings.

root-level folder would be grayed out and No would be listed under Latest next to the file) is no longer there.

if (nav->MoveToFirstChild()) { Navigate(nav, depth+1); nav->MoveToParent(); } if (nav->MoveToNext()) Navigate(nav, depth); } void main() { XmlDocument ^doc = gcnew XmlDocument(); try { doc->Load("Monstersxml"); XPathNavigator ^nav = doc->CreateNavigator(); nav->MoveToRoot(); Navigate(nav, 0); } catch (Exception ^e) { Console::WriteLine("Error Occurred: {0}", e->Message); } } The first thing you have to remember when working with the XPathNavigator class is that you need to import the namespace System::Xml::XPath using the following command: using namespace System::Xml::XPath; I personally think of the XPathNavigator as a token that I move around that shows where I currently am in the DOM tree In the preceding program I use only one XPathNavigator object pointer that gets passed around This pointer eventually passes by every node of the DOM tree.

Although the previous example includes just a single binding, you don t need to stop there. If you wanted, you could set the TextBlock up to draw its text from a text box, its current foreground and background color from separate lists of colors, and so on. Here s an example: <TextBlock Margin="3" Name="lblSampleText" FontSize="{Binding ElementName=sliderFontSize, Path=Value}" Text="{Binding ElementName=txtContent, Path=Text}" Foreground="{Binding ElementName=lstColors, Path=SelectedItem.Tag}" > </TextBlock> Figure 16-3 shows the triple-bound TextBlock.

Figure 16-3. A TextBlock that s bound to three elements You can also chain data bindings. For example, you could create a binding expression for the TextBox.Text property that links to the TextBlock.FontSize property, which contains a binding expression that links to the Slider.Value property. In this case, when the user drags the slider thumb to a new position, the value flows from the Slider to the TextBlock and then from the TextBlock to the TextBox. Although this works seamlessly, a cleaner approach is to bind your elements as closely as possible to the data they use. In the example described here, you should consider binding both the TextBlock and the TextBox directly to the Slider.Value property.

s Note To see this dialog box, so you can see how it works for you, you can do the following: Have two

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