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

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C# / CSharp Tutorial » Class » Object Reference 
7.3.12.Reference an object by interface and class
  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();
   }
}
7.3.Object Reference
7.3.1.Declare class fields and methods
7.3.2.Declare a House object reference named myHouse
7.3.3.Creating a House object and assigning its memory location to myHouse
7.3.4.Assign values to the House object's fields using object renerence
7.3.5.Display the field values using object reference
7.3.6.Declare another House object reference and create another House object
7.3.7.Change the object referenced by the myHouse object reference to the object referenced by yourHouse
7.3.8.Reference type equals: complex number
7.3.9.Reference equals
7.3.10.Reference a static member function without using the class name
7.3.11.Overridden Equals()
7.3.12.Reference an object by interface and class
7.3.13.Pass reference type variable without 'out' and 'ref'
7.3.14.Use interface as reference
7.3.15.Reference one object by multiple interfaces
7.3.16.Class comparison
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