Not getting Inheritance concept

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1. Why I am not able to access S class method.
2. And why am I able to create the method with the same name in class M

C#

public class S
     {
         public S()
         {
         }

         public int myFunc(int a, int b)
        {
             return a + b;
         }
     }

    public class M:S
    {
         public M()
         {
         }

        public string myFunc(int a, int b)
         {
             return (a + b).ToString();
        }
     }
 public class Test
 {
     public static void Main(string[] args)
     {
          M mm = new M();
          mm.myFunc(1,2);   // Why I am not able to access S class myFunc
     }
 }

Posted 26-Feb-14 1:59am

Manish Kumar Namdev

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Krunal Rohit 26-Feb-14 8:07am

what error are you getting ?
-KR

2 solutions

Solution 1

first of all you must use "new" keyword when you have method with same signature in both parent and child classes. you are not able to access S myFucntion because when you instantiate an object like

C#

M mm = new M();

that's mean you are pointing to M class, if the method with same signature is available in both parent and child classes then it depends on which object you are creating? change your code to

C#

S mm = new S();

and you will be able to call s myFunc.

Posted 26-Feb-14 2:12am

Faisalabadians

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CPallini · Accepted Answer · 2014-02-26T02:36:00

Quote:
1. Why I am not able to access S class method.

You actually can.
Since, by the very inheritance concept, M is S, you may call it.
However, M::myFunc hides S::myFunc, so you need a workaround, e.g.:

C#

int k = (mm as S).myFunc(1,2);

Quote:
2. And why am I able to create the method with the same name in class M

Because the compiler (reluctantly :-) ) allows that. However, if shadowing the method is really your intention, then you'd better inform (as already suggested) the compiler itself using new.