C#：动态运行时转换

动态运行时转换

csharp
// 定义一个基类
class Animal
{
    public string Name { get; set; }
}
// 定义一个派生类
class Cat : Animal
{
    public void Meow()
    {
        Console.WriteLine("喵喵喵");
    }
}
// 定义一个派生类
class Dog : Animal
{
    public void Bark()
    {
        Console.WriteLine("汪汪汪");
    }
}
// 使用as关键字进行动态转换
Animal animal1 = new Animal();
Cat cat1 = animal1 as Cat;
if (cat1 != null)
{
    cat1.Meow();
}
else
{
    Console.WriteLine("转换失败");
}
Animal animal2 = new Dog();
Cat cat2 = animal2 as Cat;
if (cat2 != null)
{
    cat2.Meow();
}
else
{
    Console.WriteLine("转换失败");
}

csharp
// 使用is关键字进行类型判断和转换
Animal animal = new Dog();
if (animal is Cat)
{
    Cat cat = (Cat)animal;
    cat.Meow();
}
else if (animal is Dog)
{
    Dog dog = (Dog)animal;
    dog.Bark();
}
else
{
    Console.WriteLine("未知类型");
}