Private and final methods in C#

Private Methods

To set private methods, use the private access specifier.

Private access specifier allows a class to hide its member variables and member functions from other functions and objects. Only functions of the same class can access its private members. Even an instance of a class cannot access its private members.

Final Methods

For final methods, use the sealed modifier.

When you use sealed modifiers in C# on a method, then the method loses its capabilities of overriding. The sealed method should be part of a derived class and the method must be an overridden method.

Let us see an example −

The following example won’t allow you to override the method display() because it has a sealed modifier for the ClassTwo derived class.

ClassOne is our base class, whereas ClassTwo and ClassThree are derived classes.

Example

class ClassOne {
   public virtual void display() {
      Console.WriteLine("baseclass");
   }
}

class ClassTwo : ClassOne {
   public sealed override void display() {
      Console.WriteLine("ClassTwo: DerivedClass");
   }
}

class ClassThree : ClassTwo {
   public override void display() {
      Console.WriteLine("ClassThree: Another Derived Class");
   }
}

Above, under ClassThree derived class we have tried to override the sealed method. This will show an error since it is not allowed when you use the sealed method.

George John

Published on 14-Aug-2018 14:06:52