Confused with override and new functionality C#

 

This question already has an answer here:

  • Difference between shadowing and overriding in C#? 5 answers
  • When you mark a class member as virtual it can be overrided in the sub classes.

  • If you want to change a method (which was declared virtual in base class) in sub class you can use both new and override keywords but there is a difference between them

    . When using new : if you cast an object of sub class as base class, then call that method, base class implementation will run

    . When using override : if you cast an object of sub class as base class, then call that method, sub class implementation will run.

    • Here is the code 

    AbstractClass instance = new DerivedClass();
instance.SayGoodbye();  //See you later - In derived class I'm in  NEW  member

    But if you use override 

    AbstractClass instance = new DerivedClass();
instance.SayGoodbye();  //Goodbye- abstract member n
    链接地址: http://www.djcxy.com/p/38132.html

    上一篇: 在继承的虚函数中调用子类的方法？

    下一篇: 与重写和新功能混淆C＃