c#自定义泛型类

闲来无事，自己研究了泛型类的简单的使用，

 

where表示泛型约束，表示泛型类型中的参数只能是car类型，IEnumerable是一个接口，一个集合要支持FOREAch遍历，

必须实现IEnumerable接口

public class Car { public string PetName; public int Speed; public Car(string name, int currentSpeed) { PetName = name; Speed = currentSpeed; } public Car() { } } public class CarCollection<T> : IEnumerable<T> where T : Car { private List<T> Tcars = new List<T>(); //添加 public void AddCar(T t) { Tcars.Add(t); } //获取其中一个 public T GetCar(int pos) { return Tcars[pos]; } public int Count() { return Tcars.Count; } #region IEnumerable<T> 成员 public IEnumerator<T> GetEnumerator() { return Tcars.GetEnumerator(); } #endregion #region IEnumerable 成员 System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return Tcars.GetEnumerator(); } #endregion }

 

 

private void button1_Click(object sender, EventArgs e) { Car car1 = new Car("one", 150); Car car2= new Car("two", 50); Car car3 = new Car("three", 150); CarCollection<Car> cars = new CarCollection<Car>(); cars.AddCar(car1); cars.AddCar(car2); cars.AddCar(car3); MessageBox.Show(cars.Count().ToString()); foreach (Car item in cars) { MessageBox.Show(item.PetName+"--"+item.Speed.ToString()); } }