无法将类型 'polymorphism.vehicles' 的对象强制转换为类型"多态性"。汽车

Question

public class vehicles
{
    public string name = "genreal";
    public string category = "general"; 
    public virtual void type()
    {
        Console.WriteLine(" my name is " + name + " my category is " + category + " I am from Vehicles class");
    }
}
public class bike : vehicles
{
    public override void type()
    {
        name = "Honda";
        category = "Bike";
        Console.WriteLine("my name is " + name + " my category is " + category + " I am from Bike class");
    }
}
public class Car : vehicles
{
    public override void type()
    {
        name = "Suzuki";
        category = "Car";
        Console.WriteLine(" my name is " + name + " my category is " + category + " I am from car class");
    }
}

这是我彼此继承的我的班级，现在我试图调用派生的类方法。我们都知道Polymorhpism使您能够在运行时通过基类转换变量调用派生的类方法。但是我在这里几乎没有更改，我通过使用parent类求和变量和父级对象来调用它

vehicles V = new vehicles();
((Car)V).type();
Console.ReadLine();

这给出了例外Unable to cast object of type 'polymorphism.vehicles' to type 'polymorphism.Car'是因为我们不能将父氏clas抛在子班上吗？我不确定请指导我

Answer 1

您无法从父班上施放子类。您需要创建VAR作为Car，然后从那里可以访问Car方法

Car c = new Car();
c.type();

从那里您可以访问父亲的财产和孩子。