One name many forms

public abstract class AppleBase  

   {  

       public AppleBase()  

       {  

       }  

  

       public abstract void SetName();  

   } 



Derived class MacBook, Overriding a SetName method.

1. 
   class MacBook : AppleBase  
   
2. 
      {  
   
3. 
          public MacBook()  
   
4. 
          {  
   
5. 
               
   
6. 
          }  
   
7. 
          public override void SetName()  
   
8. 
          {  
   
9. 
              Console.WriteLine("Name: MacBook Pro");  
   
10. 
           }  
    
11. 
       } 
    
    
    

Let us execute this in the Main method.

1. 
   class Program  
   
2. 
     {  
   
3. 
         static void Main(string[] args)  
   
4. 
         {  
   
5. 
             MacBook macBook = new MacBook();  
   
6. 
             macBook.SetName();  
   
7. 
         }  
   
8. 
     } 
   
   
   

Let's see an output.

 

 

It works, but to take advantage of that constructor in an abstract class, we have to automate something.

 

It could be initializing properties or anything.

 

In our case, we can directly call an abstract method SetName() inside a constructor. So that we wouldn't need of calling SetName() method with an object of MacBook in the Main method.

1. 
   public abstract class AppleBase    
   
2. 
      {    
   
3. 
          public AppleBase()    
   
4. 
          {    
   
5. 
              SetName();    
   
6. 
          }    
   
7. 
       
   
8. 
          public abstract void SetName();    
   
9. 
      }    
   
10. 
        
    
11. 
    class Program    
    
12. 
       {    
    
13. 
           static void Main(string[] args)    
    
14. 
           {    
    
15. 
               MacBook macBook = new MacBook();       
    
16. 
              //macBook.SetName();  
    
17. 
           }    
    
18. 
       }   
    
    
    

And the output will be the same.

 

Amazing. Finally, mystery solved. Pheww.

 

Conclusion

 

In this article, we learned.

• 
  What is the purpose of the constructor inside an abstract class?
  
• 
  What is constructor chaining?
  
• 
  How to utilize constructors of abstract classes.