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The first issue with creating nodes dynamically is that you need access to the XmlDocument, as all the XmlNode creation methods are found in it. You have two choices: pass XmlDocument as a parameter as was done in this example, or make XmlDocument a private member variable that all classes can access. Now that you have access to the creation methods, it is a simple matter to create the element: XmlElement ^skeleton = doc->CreateElement("Monster"); Then you create and append any of its child elements: XmlElement ^weapon = doc->CreateElement("Weapon"); skeleton->AppendChild(weapon); Of course, to create these child elements, you need to create and append the child elements attribute(s) and body text (which might have to create grandchildren nodes, and so on): XmlAttribute ^att = doc->CreateAttribute("Number"); att->Value = "2"; weapon->Attributes->Append(att); att = doc->CreateAttribute("Damage"); att->Value = "1d3-1"; weapon->Attributes->Append(att); weapon->AppendChild(doc->CreateTextNode("Claw")); Figure 13-7 shows the resulting new copy of the XML monster file from WriteXMLDOM.exe with the new inserted monster in the Visual Studio 2005 editor.

WPF doesn t raise exceptions to notify you about data binding problems. If you specify an element or a property that doesn t exist, you won t receive any indication instead, the data will simply fail to appear in the target property. At first glance, this seems like a debugging nightmare. Fortunately, WPF does output trace information that details binding failures. This information appears in Visual Studio s Output window when you re debugging the application. For example, if you try to bind to a nonexistent property, you ll see a message like this in the Output window: System.Windows.Data Error: 35 : BindingExpression path error: 'Tex' property not found on 'object' ''TextBox' (Name='txtFontSize')'. BindingExpression:Path=Tex; DataItem='TextBox' (Name='txtFontSize'); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String') WPF also ignores any exception that s thrown when you attempt to read the source property and quietly swallows the exception that occurs if the source data can t be cast to the data type of the target property. However, there is another option when dealing with these problems you can tell WPF to change the appearance of the source element to indicate that an error has occurred. For example, this allows you to flag invalid input with an exclamation icon or a red outline. The Validation section later in this chapter demonstrates this technique.

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It sets the font of the text box directly. As a result, the slider position isn t updated to match. Even worse, this has the effect of wiping out your font size binding and replacing it with a literal value. If you move the slider thumb now, the text block won t change at all. Interestingly, there s a way to force values to flow in both directions: from the source to the target and from the target to the source. The trick is to set the Mode property of the Binding. Here s a revised bidirectional binding that allows you to apply changes to either the source or the target and have the other piece of the equation update itself automatically: <TextBlock Margin="10" Text="Simple Text" Name="lblSampleText" FontSize="{Binding ElementName=sliderFontSize, Path=Value, Mode=TwoWay}" > </TextBlock>

Figure 3-24. The shelveset process Shelvesets exist in TFVC but are unversioned. They can also be deleted, whereas a changeset cannot be deleted. Another common scenario is that you can share your code with other developers without contaminating the code base (for example, if you are experimenting and want to get help with code from another developer).

Wouldn t it be nice to have easy sequential access through an XML file and the concept of a current location like you have with XmlReader discussed previously, but without the restriction of forwardonly access You do It s called the XPathNavigator class If you were comfortable with the XmlReader class, then you should have no trouble adapting to the XPathNavigator class, as many of its properties and methods are very similar Also, if you were comfortable with XmlDocument, you should have few problems with XPathNavigator because you will find a lot of overlap between them The following are some of the more common XPathNavigator properties: HasAttributes is a Boolean that is true if the current node has attributes; otherwise, it is false HasChildren is a Boolean that is true if the current node has children; otherwise, it is false.

In this example, you have no reason to use a two-way binding (which requires more overhead) because you can solve the problem by using the right code. However, consider a variation of this example that includes a text box where the user can set the font size precisely. This text box needs to use a two-way binding, so it can both apply the user s changes and display the most recent size value in the text box when it s changed through another avenue. You ll see this example in the next section.

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