Inheriting the same method from multiple interfaces

Question

What we know is that multiple (interface) inheritance is allowed in C #, but I want to know if two interfaces are possible Example:

 interface calc1
{
    int addsub(int a, int b);
}
interface calc2
{
    int addsub(int x, int y);
}

with the same method name with the same type and with a parameter of the same type

will inherit in the class above?

class Calculation : calc1, calc2
{
    public int result1;
    public int addsub(int a, int b)
    {
        return result1 = a + b;
    }
    public int result2;
    public int addsub(int x, int y)
    {
        return result2= a - b;
    }
}

if so, which interface method will be called.

Thanks in advance.

Answer 1

You cannot overload such a method, no - they have the same signature. Your options:

• Use one implementation that will be called by both interfaces

• Use an explicit interface implementation for one or both methods, for example

  int calc2.addsub(int x, int y)
  {
      return result2 = a - b;
  }
  

  , Calculation; , . :

  public void ShowBoth()
  {
      Console.WriteLine(((calc1)this).addsub(5, 3)); // 8
      Console.WriteLine(((calc2)this).addsub(5, 3)); // 2
  }