C - Inheritance - hidden method

We cannot delete any member in the parent class , But you can mask the parent member with the same name as the parent member

Grammatical details ：

• Mask data members - Declare members with the same name and type in subclasses
• Mask function members ： Declare a new member with the same function signature in a subclass
• Let the compiler know ： Add new keyword , Otherwise it will call the police

for example , The following are the fields and methods of the parent class

lass Pet
{
    public string Name;
    public void PrintName()
    {
        Console.WriteLine("Pet name is " + Name);
    }
}

Then when a method with the same name is created in a subclass

class Dog:Pet
{
new public void PrintName()// added new After keyword , When called below, it calls the methods of subclasses 
    {
        Console.WriteLine(" The dog's name is " + Name);
    }
}

The printed result is not the called parent method , In this way, the hidden method can be achieved

Whether we want to call the subclass or the parent PrintName Depends on what we quote

Dog dog = new Dog

The subclass will call the subclass

Pet dog = new Dog

  This call is the parent class , What you print out is Pet name is 了

class Program
{
    static void Main(string[] args)
    {
      Dog dog = new Dog();// If it doesn't new Words , The print out here is in English 
        dog.Name = "jack";
        dog.PrintName();

 The dog's name is jack
Pet name is tom