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Note There s still one more option: you can explicitly create a view object as a resource in your XAML, bind

In .NET CLR languages, such as Visual Basic and C#, the Observer pattern is built into the language in the form of events. Events follow a publish/subscribe model whereby one object will fire its event and any objects that are registered listeners will receive notification that the event has fired. The subscriber list is managed internally by the event and there is even some syntactic sugar so that events can be registered and unregistered using the += and -= operators. The Observer pattern enables loose coupling between the publisher and the subscriber: the publisher has absolutely no knowledge of its subscribers, while the subscriber references the publisher. So, we can say that the dependency is directed from subscriber to publisher. Without this pattern, if you wanted to be informed of a state change on an object, you d have to continually check its value for changes. This process is called polling, and it s the opposite of observing. In order to poll for changes, you d have to continually loop until a change was discovered and then act upon that change. This can be extremely inefficient, so an event-based model is often preferred. In UML, the class diagram for the Observer pattern looks like the one in Figure 4 8.

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your controls to the view, and fill your view with data in code. This option is primarily useful if you want to customize the view by applying sorting and filtering, although it s also preferred by some developers as a matter of taste. In 21, you ll learn how to use views.

A Security Token Server (STS), as its name implies, is a mechanism through which tokens are processed, tokens are created, and users are authenticated. STSs should also provide support for claims transformation. 10 covers STSs in more detail. The WS-Trust protocol provides support for claims transformation.

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. You ll learn more about validation in 19.

One of the neat features of data binding is that your target is updated automatically, no matter how the source is modified. In this example, the source can be modified in only one way by the user s interaction with the slider thumb. However, consider a slightly revamped version of this example that adds a few buttons, each of which applies a preset value to the slider. Figure 8-2 shows the new window.

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