C#自定義泛型

using System; using System.Collections.Generic; using System.Text; namespace CustomGenericCollection { #region 汽車的定義 public class Car { public string PetName; public int Speed; public Car(string name, int currentSpeed) { PetName = name; Speed = currentSpeed; } public Car() { } } public class SportsCar : Car { public SportsCar(string p, int s) : base(p, s) { } // 其他方法 } public class MiniVan : Car { public MiniVan(string p, int s) : base(p, s) { } // 其他方法 } #endregion #region 自定義泛型集合 public class CarCollection<T> : IEnumerable<T> where T : Car//：下面的泛型集合類的項目必須是Car 或Car的繼承類 { private List<T> arCars = new List<T>(); public T GetCar(int pos) { return arCars[pos]; } public void AddCar(T c) { arCars.Add(c); } public void ClearCars() { arCars.Clear(); } public int Count { get { return arCars.Count; } } // IEnumerable<T>擴展自IEnumerable的，因此，我們需要實現的GetEnumerator()方法的兩個版本。 System.Collections.Generic.IEnumerator<T> IEnumerable<T>.GetEnumerator() { return arCars.GetEnumerator(); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return arCars.GetEnumerator(); } public void PrintPetName(int pos) { Console.WriteLine(arCars[pos].PetName); } } #endregion class Program { static void Main(string[] args) { Console.WriteLine("***** Custom Generic Collection *****\n"); 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.WriteLine(); // CarCollection<Car> can hold any type deriving from Car. CarCollection<Car> myAutos = new CarCollection<Car>(); myAutos.AddCar(new MiniVan("Family Truckster", 55)); myAutos.AddCar(new SportsCar("Crusher", 40)); foreach (Car c in myAutos) { Console.WriteLine("Type: {0}, PetName: {1}, Speed: {2}", c.GetType().Name, c.PetName, c.Speed); } Console.ReadLine(); } } }