Reference an object by interface and class : Object Reference « Class « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Class
3. Object Reference

1. You can create an interface reference variable.
2. Such a variable can refer to any object that implements its interface.
3. When you call a method on an object through an interface reference, the method is the version of the method implemented by the object.

public interface Player
{
 void PlayMusic();
}

public class Student : Player
{
 public void PlayMusic(){}
 public void DoALittleDance(){}
}

public class MainClass
{
   static void Main()
   {
      Student st = new Student();
      Player musician = st;

      musician.PlayMusic();
      st.PlayMusic();
      st.DoALittleDance();
   }
}