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<TextBlock Text="{Binding Path=OuterXml}" />
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This is something that would be hard to do using XPath. If you re coding along, you should have a list showing each ref XML item in the list. Among other things, this happens to be a convenient way to quickly visualize which XML elements are bound in a particular context and what s available on them. When we first set up the XML bindings, we bound to the OuterXml everywhere to watch as
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the context of the data changed. Before we head to the next section, the binding needs to be set back to using XPath.
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<TextBlock Text="{Binding XPath=@name}" />
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One thing that might not be entirely clear is how the binding knows what to execute the Path or the XPath against. The way this works is based on the current DataContext, which is what we ll cover next.
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11.3.5 Understanding and using DataContexts Whenever you specify a binding, you implicitly set up a data context. A data context is the data source at any given visual element, and it s used by every subsequent element up the tree until it changes. For example, the ListBox s data context is the collection of elements returned from the XmlDataProvider. Because the ListBox is designed to work with lists, it automatically doles out each element in the collection to each list item, so the data context for an individual item in the ListBox is the element from the collection. We ll take this a little bit farther by hooking up some of the controls in the righthand pane the details from the currently selected item in the list box. UIElements all have a DataContext property that specifies where they ll go looking for data if no explicit source is specified as part of a Binding operation. We could set the DataContext on each of the controls that we want to bind; but, because the DataContext is inherited, if we set it on the GroupBox that holds all the controls, they ll automatically have the same context.
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<GroupBox.DataContext> <Binding ElementName="listBox1" Path="SelectedItem" /> </GroupBox.DataContext>
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This says that the DataContext for the GroupBox (and its children) is the SelectedItem property on the listBox1 ListBox control. Now, when we bind the individual elements, we only have to specify the binding relative to that data context. Figure 11.10 shows a visual representation of this. If we had an even deeper hierarchy, we could repeat this process ad nauseam. We have four labels set up across a WrapPanel to show the name and status of each item as we click it. Without defining any sources on the Label controls themselves, we can specify Path or XPath bindings as if we specified the XML element. We add the following Content tags to the Labels:
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<WrapPanel> <Label Height="23">Name:</Label> <Label FontWeight="Bold" Height="23" Content="{Binding XPath=@name}" MinWidth="100" /> <Label Height="23">Status:</Label> <Label FontWeight="Bold" Height="23" Content="{Binding XPath=status}" MinWidth="80" /> </WrapPanel>
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Binding to XML
Application Model
XML Document Source
Application View Target Item List Target Detail View
Selected Item Source
Figure 11.10 Because a binding target can be a source as well, the detail view can bind to the SelectedItem of the UI list, rather than working out how to track the active item in the XML source itself.
We bind the first label to the value from the name attribute and the second label to the value of the status element. (Because there s no @ sign in front of status, XPath interprets that to mean that we want the contents of a child element.) Directly after the WrapPanel, we can now bind our description as well.
<TextBlock Margin="10,10,10,20" TextWrapping="Wrap" Text="{Binding XPath=desc}" />
Because there s no selected item in the designer, the property will be null, and we won t see anything as we set all these up. But when you run the application, you should be able to click through the list and see the name, description, and status fields all populated. When the SelectedItem changes, the Binding we set on the DataContext property of the GroupBox catches the PropertyChanged event fired from the first ListBox and sets the DataContext accordingly. When the DataContext changes, the subsequent controls are then notified, and all the bindings we just defined are reevaluated and updated. Beautiful. The next thing we want to do is to populate the ListBox that shows all the refs from the item xml. The refs are references to relevant data about the particular problem, and most of them include URLs to more detailed documentation. Listing 11.6 shows the XAML for binding the ListBox in the middle-right to the list of refs.
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