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Properties can also be declared static. Accessors of static properties, like all static members Cannot access instance members of a class although they can be accessed by them Exist regardless of whether there are instances of the class Must be referenced by the class name, rather than an instance name, when being accessed from outside the class For example, the following code shows a class with a static property called MyValue that is associated with a static field called myValue. In the first three lines of Main, the property is accessed, even though there are no instances of the class. The last line of Main calls an instance method that accesses the property from inside the class. class Trivial { static int myValue; public static int MyValue { set { myValue = value; } get { return myValue; } } public void PrintValue() Accessed from inside the class { Console.WriteLine("Value from inside: {0}", MyValue); } } class Program { static void Main() Accessed from outside the class { Console.WriteLine("Init Value: {0}", Trivial.MyValue); Trivial.MyValue = 10; Accessed from outside the class Console.WriteLine("New Value : {0}", Trivial.MyValue); Trivial tr = new Trivial(); tr.PrintValue(); } }

Good fences make good neighbors As it turns out, good fences (or perhaps, good chasms) strong separation between otherwise independent classes make for better code You ve already seen how pulling code out of the code-behind and into the ViewModel, and then out of the ViewModel and into services, has made the code less brittle and more reusable At the end of this chapter, you ll also see that it has made the code more testable One of a few places where you re still tightly coupled is via the use of events and event handlers to intercept clicks from the UI and call functions on the ViewModel This isn t horrible; it just limits the things that can listen for and respond to the UI actions, and it makes testing a little harder because there s code in the code-behind that must be duplicated in the test.

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Metadata is an extremely complex system, and literally hundreds of validity rules need to be enforced High-level language compilers, such as VB NET or C# compilers, provide a significant level of protection against invalid metadata emission because they shield the actual metadata specification and emission from programmers The high-level languages are concept driven and concept based, and it is the compiler s duty to translate the language concepts to the metadata structures and IL code constructs, so a compiler can be built to emit valid structures and constructs (Well, more or less) On the other hand, ILAsm, like other assemblers, is a platform-oriented language and allows a programmer to generate an enormously wide range of metadata structures and IL constructs, only a fraction of which represent a valid subset In view of this bleak situation, we need to rely on external validation and verification tools.

In this section, we ll look at two ways you can have elements in XAML invoke methods in the ViewModel The first approach, ICommand, is the traditional way initially introduced in WPF and supported in most MVVM toolkits The second, the CallMethodAction behavior, is a new approach introduced with Expression Blend 4 Structured method invocation isn t the only way to separate the UI from the rest of the system Some slightly more insidious couplings have made it through right under our noses; we ll need to address them The first is the use of entities coming from your database model You can do this if you really want, but for a number of reasons to be explained, I don t like to The second coupling is through the use of concrete types referenced from your various classes In section 164.

time set the EventName in the Triggers bucket to Loaded and the StateName to the MouseLeave State. This will make the Buttons and decorations fly off screen as soon as the application is loaded. Your Properties panel should look like what I have in Figure 6-83.

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