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Figure 9-1. Creating a Win Form Hello World! application project Once the project template is finished being built, you have a complete Windows application. Okay, on to the next chapter . . . Just kidding! The process of building the Hello World! application involves the following steps: 1. Expand the GUI Toolbox view. 2. Click the required GUI component in the Toolbox view. 3. Drag the component to the design form. 4. Change the component s properties in the Properties view. 5. Double-click the component to create the event handler for the component. This will bring up the IDE editor. 6. Enter the code in the IDE editor to handle the event for the component. This is very straightforward. If this level of simplicity gives you the willies, as it did me, be comforted by the fact that you can go in and code everything by hand if you want. After a while, you will come to realize that you do not have to code much in the way of the GUI interface manually. So what code is provided Listing 9-1 shows Hello.cpp. It doesn t look as if much is going on, but looks can be deceiving.

class MyDataContractResolver : DataContractResolver { }

When the test is complete, the performance results for the code tested will be displayed. Viewing a performance result in this format is extremely helpful because it does not contain an overwhelming amount of information and you can comfortably digest the information. This will allow you to discover issues in individual methods (or processes, depending on how complicated your unit test is) and fix them easily (well, hopefully).

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Here is how you code destructor logic, if you want all your bases covered for an object that has managed and unmanaged memory and resources to clean up: ref class ChildClass : public ParentClass { public: ~Test() { // free all managed and unmanaged resources and memory } protected: !Test() { // free all unmanaged resources and memory only } } The managed cleanup code is only found in the deterministic cleanup destructor, whereas unmanaged cleanup is found in both the deterministic cleanup and Finalize destructor. One thing you will find is that there is usually duplicate unmanaged memory and resource cleanup code in both of these destructors. Most likely, you will write an additional method, which these destructors call to eliminate this duplication.

Virtual methods are the cornerstone of polymorphism, as they allow different child ref classes derived from a common base ref class to respond to the same method call in a way specific to each child ref class. Polymorphism occurs when a virtual method is called through a base ref class handle. For example: BaseClass ^BaseObject = gcnew ChildClass() BaseObject->DoStuff() // will call the Child class version instead of the Base // class version as long as DoStuff is declared a virtual. This works because when the call is made, it is the type of the actual object pointed to that determines which copy of the virtual method is called. Technically, when you declare a virtual method, you are telling the compiler that you want dynamic or runtime binding to be done on any method with an identical signature in a derived ref class. To make a method virtual, you simply need to place the keyword virtual in front of the method declaration. virtual void Speak () {} Any method that you declare as virtual will automatically be virtual for any directly or indirectly derived ref class. Normally, in a standard virtual animal example, you would first declare a base ref class Animal with a virtual method of Speak(). You then create specific animal-type ref classes derived from Animal and override the virtual method Speak(). In the main() function, you would create an array of Animal objects and assign specific animal derived objects to it. Finally, you would loop through the Animal array. Because the Speak() method is virtual, the actual object type assigned to the Animal array determines which Speak() to execute.

Override the TryResolveType and ResolveName methods. TryResolveType is called on serialization to map a type into the name and namespace used to define the xsi:type, while ResolveName is called on deserialization to map the xsi:type name and namespace back into a type. The TryResolveType method returns a Boolean indicating whether the resolver is able to resolve the type that was passed in, and two XmlDictionaryStrings, which will be used to write the resolved name and namespace on the wire. ResolveName also takes a declared type and a known type resolver, but it works the opposite way. It takes two strings that represent the name and namespace, and returns a type. The following is the code to override the methods:

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