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As you have seen, the System.Collections.Generic namespace provides numerous types that allow you to create type-safe and efficient containers. Given the set of available choices, the chances are quite good that you will not need to build custom collection types when programming with .NET 2.0. Nevertheless, to illustrate how you could build a stylized generic container, the next task is to build a generic collection class named CarCollection<T>. Like the nongeneric CarCollection created earlier in this chapter, this iteration will leverage an existing collection type to hold the subitems (a List<> in this case). As well, you will support foreach iteration by implementing the generic IEnumerable<> interface. Do note that IEnumerable<> extends the nongeneric IEnumerable interface; therefore, the compiler expects you to implement two versions of the GetEnumerator() method. Here is the update: public class CarCollection<T> : IEnumerable<T> { private List<T> arCars = new List<T>(); public T GetCar(int pos) { return arCars[pos]; }

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public class User{ } The important change that was not covered in 8 is to configure your Flex project using a remote server. Usually, you can do this when you create a new Flex project by choosing the Java EE item within the Application Server Type combo box, and unchecking the Use remote object access service check box, as shown in Figure 9-20.

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public void AddCar(T c) { arCars.Add(c); } public void ClearCars() { arCars.Clear(); } public int Count { get { return arCars.Count; } } // IEnumerable<T> extends IEnumerable, therefore // we need to implement both versions of GetEnumerator(). IEnumerator<T> IEnumerable<T>.GetEnumerator() { return arCars.GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { return arCars.GetEnumerator(); } } You could make use of this updated CarCollection<T> as so: static void Main(string[] args) { Console.WriteLine("***** Custom Generic Collection *****\n"); // Make a collection of Cars. CarCollection<Car> myCars = new CarCollection<Car>(); myCars.AddCar(new Car("Rusty", 20)); myCars.AddCar(new Car("Zippy", 90)); foreach (Car c in myCars) { Console.WriteLine("PetName: {0}, Speed: {1}", c.PetName, c.Speed); } Console.ReadLine(); } Here you are creating a CarCollection<T> type that contains only Car types. Again, you could achieve a similar end result if you make use of the List<T> type directly. The major benefit at this point is the fact that you are free to add unique methods to the CarCollection that delegate the request to the internal List<T>.

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Currently, the CarCollection<T> class does not buy you much beyond uniquely named public methods. Furthermore, an object user could create an instance of CarCollection<T> and specify a completely unrelated type parameter: // This is syntactically correct, but confusing at best... CarCollection<int> myInts = new CarCollection<int>(); myInts.AddCar(5); myInts.AddCar(11); To illustrate another form of generic abuse, assume that you have now created two new classes (SportsCar and MiniVan) that derive from the Car type:

Figure 9-20. New Flex Project dialog box with the server technology set to use Java EE as remote server

public class SportsCar : Car { public SportsCar(string p, int s) : base(p, s){} // Assume additional SportsCar methods } public class MiniVan : Car { public MiniVan(string p, int s) : base(p, s){} // Assume additional MiniVan methods } Given the laws of inheritance, it is permissible to add a MiniVan or SportsCar type directly into a CarCollection<T> created with a type parameter of Car: // CarCollection<Car> can hold any type deriving from Car CarCollection<Car> myCars = new CarCollection<Car>(); myIntsAddCar(new MiniVan("Family Truckster", 55)); myIntsAddCar(new SportsCar("Crusher", 40)); Although this is syntactically correct, what if you wished to update CarCollection<T> with a new public method named PrintPetName() This seems simple enough just access the correct item in the List<T> and invoke the PetName property: // Error! SystemObject does not have a // property named PetName public void PrintPetName(int pos) { ConsoleWriteLine(arCars[pos].

PetName); } However, this will not compile, given that the true identity of T is not yet known, and you cannot say for certain if the item in the List<T> type has a PetName property When a type parameter is not constrained in any way (as is the case here), the generic type is said to be unbound By design, unbound type parameters are assumed to have only the members of SystemObject (which clearly does not provide a PetName property) You may try to trick the compiler by casting the item returned from the List<T> s indexer method into a strongly typed Car, and invoking PetName from the returned object: // Error! // Cannot convert type 'T' to 'Car' public void PrintPetName(int pos) { ConsoleWriteLine(((Car)arCars[pos]).

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