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dataArray[currentPos++] = value; } public T Pop() { return dataArray[--currentPos]; } public T this[int index] { get { return dataArray[index]; } } } Not all the members in a generic class have to use the type parameter. As an example, the stack shown in Listing 15-7 adds a read-only property that uses regular types. Listing 15-7. Adding a Regular Member to a Generic Class class GenericStack<T> { T[] dataArray = new T[10]; int currentPos = 0; public void Push(T value) { dataArray[currentPos++] = value; } public T Pop() { return dataArray[--currentPos]; } public T this[int index] { get { return dataArray[index]; } } public int CurrentPosition { get { return currentPos; } } } When we create an object from a generic class, the transformation to substitute the type parameter in the class definition to the type we have requested is performed throughout the class. So, if we create an instance of GenericStack<int> from the GenericStack<T> class shown in Listing 15-7, every T in the class is replaced with int. This means that to use, say, the Pop method, we have to provide an int parameter. Listing 15-8 contains a demonstration of using a GenericStack<int> object.

Listing 15-8. Using an Object Created from a Generic Class using System; class Listing 08 { static void Main(string[] args) { GenericStack<int> intStack = new GenericStack<int>(); intStack.Push(2); intStack.Push(4); intStack.Push(8); for (int i = 0; i < 3; i++) { Console.WriteLine("Pop value: {0}", intStack.Pop()); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } As you can see from the listing, once we have specified the type for the generic class, we use the members as normal. Compiling and running the code in Listing 15-8 produces the following output: Pop value: 8 Pop value: 4 Pop value: 2 Press enter to finish If you look back to the start of the chapter, you will see that this is the same output that we got from Listing 15-1. However, the benefit of generics is that we can use the same class defined in Listing 15-7 to work with string values (or any other object) without making any changes to the generic class. Here is an example of using GenericStack<T> with strings: GenericStack<string> stringStack = new GenericStack<string>(); stringStack.Push("C#"); stringStack.Push("to"); stringStack.Push("Introduction"); for (int i = 0; i < 3; i++) { Console.WriteLine("Pop value: {0}", stringStack.Pop()); } Compiling and running these statements produces the following output:

Customer (b)

Pop value: Introduction Pop value: to Pop value: C# You don t need to use the type parameter notation when you define a constructor for a generic class. Even though the class is GenericStack<T>, the constructor is named GenericStack, as shown in Listing 15-9. Listing 15-9. Implementing a Constructor for a Generic Class class GenericStack<T> { T[] dataArray; int currentPos; public GenericStack(int capacity) { dataArray = new T[capacity]; currentPos = 0; } public void Push(T value) { dataArray[currentPos++] = value; } public T Pop() { return dataArray[--currentPos]; } } The constructor in the generic class in Listing 15-9 is shown in bold. I have taken the opportunity to initialize the fields in the constructor, but that is not a requirement. I just wanted to demonstrate that you can refer to the parameterized type even in the constructor. We create objects from this class as we did previously. Here is an example:

GenericStack<int> structStack = new GenericStack<int>(10);

if (myString.length() == 0) { ... }

You are not limited to one parameterized type when you define a generic class. You can create as many as you need. Listing 15-10 contains an example of a generic class that has two deferred types. Listing 15-10. A Class with Two Parameterized Types using System; class KeyStack<TKey, TKey[] keysArray TVal[] valsArray int currentPos = TVal> { = new TKey[5]; = new TVal[5]; 0;