Sealed Class

Question

Hello Sir........... Why are you used sealed class in c# and which condition we can apply sealed class?

Jignesh Trivedi · Answer

hi, Sealed classes are used to restrict the inheritance feature of object oriented programming. Once a class is defined as a sealed class, the class cannot be inherited. public sealed class A { // Class members here. } public class B : A { } above code is give compilation error. refer http://msdn.microsoft.com/en-IN/library/ms173150.aspx hope this will help you.

Anupam Singh · Answer

We use Sealed class when, we dont want it to implemented or extended by another class. In short sealed class can not have any child or derived class. In .NET for example in .NET framework, String is a sealed class .

Keyur Patel · Answer

Hi Davin, It's good explanation about the sealed class in microsoft site. http://msdn.microsoft.com/en-us/library/88c54tsw.aspx

Shweta Lodha · Answer

One of the major use case of using Sealed class is to avoid 'Brittle base class' problem.

Lakshmanan Sethu Sankaranarayan · Answer

Hi Davin, Please check this http://www.c-sharpcorner.com/UploadFile/mahesh/SealedClasses11142005063733AM/SealedClasses.aspx

Abhishek Kumar · Answer

David, When applied to a class, the sealed modifier prevents other classes from inheriting from it. Sealed classes are used to restrict the inheritance feature of object oriented programming. Once a class is defined as a sealed class, the class cannot be inherited. Using sealed keyword will make class sealed and restricted as below. sealed class SealedClass { } A sealed class cannot be used as a base class. For this reason, it cannot also be an abstract class. Sealed classes are primarily used to prevent derivation. Sealed class should be mainly used for security purpose. Hope this makes sense to you. Many Thanks.

Princy Gupta · Answer

good article: http://www.codeproject.com/Articles/239939/Csharp-Tweaks-Why-to-use-the-sealed-keyword-on-cla

Sealed Class

Answers (7)