C#将相同的函数应用于不同的变量

class Animal
{
    public virtual void MakeSound()
    {
        Console.WriteLine("The animal makes a sound.");
    }
}

class Dog : Animal
{
    public override void MakeSound()
    {
        Console.WriteLine("The dog barks.");
    }
}

class Cat : Animal
{
    public override void MakeSound()
    {
        Console.WriteLine("The cat meows.");
    }
}

Animal animal1 = new Dog();
Animal animal2 = new Cat();

animal1.MakeSound(); // 输出：The dog barks.
animal2.MakeSound(); // 输出：The cat meows.

interface IShape
{
    void Draw();
}

class Circle : IShape
{
    public void Draw()
    {
        Console.WriteLine("Drawing a circle.");
    }
}

class Rectangle : IShape
{
    public void Draw()
    {
        Console.WriteLine("Drawing a rectangle.");
    }
}

IShape shape1 = new Circle();
IShape shape2 = new Rectangle();

shape1.Draw(); // 输出：Drawing a circle.
shape2.Draw(); // 输出：Drawing a rectangle.