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object myObject = new VolvoCar("Adam Freeman", "Black", 30, "Premium"); Car myCar = (VolvoCar)myObject; In the second of these statements, an instance of System.Object is explicitly cast to the VolvoCar type and then assigned to a local variable of the Car type, which causes an implicit upcasting to be performed.

The reason that C# requires explicit instruction for downcasting is that the operation may not work. As I mentioned, the runtime doesn t keep track of the original type of a reference type, so it is possible that the target type you are casting to isn t one that the object can perform. Listing 6-23 provides a demonstration. Listing 6-23. Performing an Illegal Explicit Cast using System; class Car { public string CarOwner; public string PaintColor; public int MilesPerGallon; public Car(string newOwner, string paintColor, int mpg) { CarOwner = newOwner; PaintColor = paintColor; MilesPerGallon = mpg; } } class Bicycle { public string BikeOwner; public int NumberOfGears; public string SaddleType; public Bicycle(string owner, int gears, string saddle) { BikeOwner = owner; NumberOfGears = gears; SaddleType = saddle; } } class Listing 23 { static void Main(string[] args) { // create an instance of Bicycle and upcast it to object object myObject = new Bicycle("Adam Freeman", 24, "Comfort"); // perform an explicit cast to Car

Car myCar = (Car)myObject; // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The code in Listing 6-23 creates a Bicycle object and implicitly upcasts it to System.Object. The result of the implicit cast is then used in an explicit cast to the Car type. Car is not the declared type or one of the base types of the object, so the runtime doesn t know how to perform the cast operation. If we compile and run the code in Listing 6-23, we get the following results: Unhandled Exception: System.InvalidCastException: Unable to cast object of type 'Bicycle' to type 'Car'. at Listing 23.Main(String[] args) in C:\ Listing 22\Listing 22.cs:line 35 This is an exception telling us that you can t cast from Bicycle to Car. Exceptions are the C# mechanism for creating and handling errors and are covered in 14. The C# compiler tries to minimize problems with explicit casting by refusing to compile statements between types that are not related. In Listing 6-23, we were trying to downcast from object to Car. This might of worked because Car is derived from object. If you were to try to cast from and to types that the compiler can tell are unrelated, then you ll get an error when you try to compile your code. Here s an example: // create an instance of Bicycle Bicycle myBike = new Bicycle("Adam Freeman", 24, "Comfort"); // perform an explicit cast to Car Car myCar = (Car)myBike; The cast in this statement will never work, and the compiler can tell because the type of the object and the target type in the cast operation are unrelated.

At least for the early access releases of JDK 6.0, Sun has yet to add @ConstructorProperties lines to the core library classes that are typically used as JavaBeans components. So, if you use an IDE, the core classes won t act smart and show the extra information about parameter order for constructors.

Tip We could provide C# with the ability to convert between the Bicycle and Car types by implementing a custom conversion operator. You can learn more about this feature and see some examples in 8.