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Final keyword in C#
Java has a final keyword, but C# does not have its implementation. For the same implementation, use the sealed keyword.
With sealed, you can prevent overriding of a method. 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.
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"); } }
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