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ref class Hello { String^ greeting; public: Hello(String^ str) : greeting(str) { } void Greet() { Console::WriteLine(greeting + "!"); } void SetGreeting(String^ newGreeting) { greeting = newGreeting; } }; int main() { Hello^ hello = gcnew Hello("Hi there!"); hello->SetGreeting("Hello World"); hello->Greet(); hello->SetGreeting("Howdy"); hello->Greet(); } This code creates a reference class, as indicated by the ref keyword. It s called Hello, with a constructor, a method called Greet, and another method called SetGreeting. The SetGreeting method takes a System::String parameter. The caret indicates that the parameter type is handle to String. The String class is the CLI version of a (Unicode) character string. Unlike a native string, the String object is invariant, which means it cannot be changed without creating a brand new string. In 5, you ll see how to create a string that can be manipulated and changed.

As you can see, with very little effort you have been able to create a server that publishes capabilities using C# interfaces, methods, and attributes and a client that can communicate with the server using C# objects and values without having to worry about the details of the network plumbing. This has been a crash course in WCF, but I hope that it demonstrates the basic capabilities and encourages you to look deeper into the functionality on offer.

Note For any object of a reference type, all its data members are stored in the heap, regardless of

When doing detailed placement of vector graphics on Blend s artboard, it is sometimes easier to turn off snaplines. The icon for this is located just above the Results panel at the bottom of the Blend IDE.

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As is the case for all iPod touch apps, games can be found at the App Store (see Figure 21 1). You can get them either through iTunes on your computer or through the device s built-in App Store program.

class ConcreteHandler2: IHandler { public bool HandleRequest(IContext context) { if(context is ContextForHandler2) { return true; } else { return false; } } } The classes ConcreteHandler1 and ConcreteHandler2 are implementations that will process a request Look at how the constructor of ConcreteHandler1 references another IHandler implementation, whereas ConcreteHandler2 doesn t This means that when the concrete handlers are linked together, ConcreteHandler2 will reference another concrete handler using the IContext interface In the example code, this would mean ConcreteHandler1, but doesn t have to In fact, the different concrete handlers don t need to be related in functionality If the concrete handlers process e-mail requests, there is no reason why a concrete handler for HTTP requests could not be part of the list.

Initialize with an object-creation expression. In the case of local variables, but not fields, you can simplify the syntax a bit more by having the compiler infer the type in the declaration part on the left. But I ll cover that in the section on local variables in the next chapter.

void UseData() { DataConnection connection1; DataConnection^ connection2 = gcnew DataConnection(); // Use the connection. } int main() { UseData(); // Force a garbage collection, to illustrate a point. GC::Collect(); } Here, we create two connection objects, this time using a SqlConnection. One connection is declared in the function UseData with stack semantics; the other is created with heap semantics. When the UseData function exits, the destructor gets called for connection1, but not for connection2, which becomes an orphaned object. Then, when a garbage collection occurs (in this case artificially forced by the call to GC::Collect, but in principle this could happen at some point in real-world code), an exception is generated. In this case the error reported is

The bulk of the code in the Business Methods region for most objects will be the properties Some objects may include complex methods implementing business logic, but virtually all objects include properties to allow the UI to view or update the object s values The Id property of the Project is read-only It also represents the object s unique primary key value in the database: <SystemComponentModelDataObjectField(True, True)> _ Public ReadOnly Property Id() As Guid Get CanReadProperty(True) Return mId End Get End Property Since this is the primary key for the data in the database, the value can also be considered to be a unique identifier for the object itself The DataObjectField attribute is used to specify that the property is both a primary key and an identity value This attribute is used by data binding, and in particular by the CslaDataSource ASPNET control created in 5.

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