我是C＃的新手，目前正在学习OOP。我正在尝试学习所有这些关键字的工作方式。我现在正在学习virtual关键字，并完成了该课程：
// Animal class
public class Animal
{
// Class propreties
public string name { get; set; }
public int age { get; set; }
public double happiness { get; set; }
public static int AnimalCounter = 0;
// Class constructor
public Animal(string name_ = "Spotty", int age_ = 4, double happiness_ = 3)
{
this.name = name_;
this.age = age_;
this.happiness = happiness_;
}
// Virtual methods
public virtual void Print() { }
public virtual void Woof () { }
public virtual void Meow () { }
}
我不理解的是为什么当我使用virtual时不能写protected而不是public。例如在
public virtual void Print() {}
我写时给我一个错误
protected virtual void Print() {}
据我所知，protected意味着只能在基类以及由该基类构成的所有其他类中访问该属性。
所以我有一个新类，叫做：Dog由base类Animal
组成// Dog class
public class Dog : Animal
{
/* Class Propreties */
protected double SpotCount_ { get; set; }
protected double woof_happinessIncrease_ { get; set; }
// SpotCount = > get and set // GET returns SpotCount // SET 20 if bigger or equal to 20 . SET 0 if less or equal to 0 . otherwise set it to the given value
public double SpotCount
{
get
{
return SpotCount_;
}
set
{
if(value >= 20)
{
SpotCount_ = 20;
}
else if(value <= 0)
{
SpotCount_ = 0;
}
else
{
SpotCount_ = value;
}
}
}
// woof_happinessIncrease = > get and set // GET returns woof_happinessIncrease // SET 100 if bigger or equal to 100. SET 0 if less or equal to 0 . otherwise set it to the given value
public double woof_happinessIncrease
{
get
{
return woof_happinessIncrease_;
}
set
{
if(value >= 100)
{
woof_happinessIncrease_ = 100;
}
else if(value <= 0)
{
woof_happinessIncrease_ = 0;
}
else
{
woof_happinessIncrease_ = value;
}
}
}
/* Class Constructor */
public Dog(string name_ = "Spotty", int age_ = 4, double happiness_ = 3, double SpotCount_=3, double woof_happinessIncrease_=2) : base(name_, age_, happiness_)
{
this.SpotCount_ = SpotCount_;
this.woof_happinessIncrease = woof_happinessIncrease_;
}
/* Class Override Methods */
public override void Print()
{
Console.WriteLine(String.Format("Name : {0}", this.name.ToString()));
Console.WriteLine(String.Format("Age : {0}", this.age.ToString()));
Console.WriteLine(String.Format("Happiness : {0}", this.happiness.ToString()));
Console.WriteLine(String.Format("Spot count : {0}", this.SpotCount.ToString()));
Animal.AnimalCounter++; // Increase the animal counter size by 1 every time we have a new instance of the class Dog.
}
public override void Woof()
{
// Woof and increase happiness
this.happiness += woof_happinessIncrease;
Console.WriteLine(String.Format("{0} woofed. His happiness increased by {1}. His happiness now is : {2}", this.name.ToString(), this.woof_happinessIncrease.ToString(), this.happiness.ToString()));
}
}
我用override覆盖了基类中virtual的方法。但是，如果我在基类中对virtual方法使用protected，则会给我一个错误。
有人知道为什么吗？
COMPILE ERROR：CS0507：'function1'：在覆盖'access'继承的成员'function2']时无法更改访问修饰符
试图在方法重写中更改访问规范。
我是C＃的新手，目前正在学习OOP。我正在尝试学习所有这些关键字的工作方式。我现在正在学习虚拟关键字，并且我上了这个课：//动物课公共课...
公共虚拟方法应该没有问题。