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How to block a class from being inherited further?

Posted By :Jean Paul     Posted Date :October 14, 2010    Points :10   Category :.NET Framework 
Use sealed keyword.

Eg: public sealed class TheClass

You can also find related Interview Question to How to block a class from being inherited further?  below: 

Are private class-level variables inherited?

Yes, but they are not accessible, so looking at it you can honestly say that they are not inherited. But they are. (More...)

Are private class-level variables inherited?

Yes, but they are not accessible, so looking at it you can honestly say that they are not inherited. But they are. (More...)

Can you allow class to be inherited, but prevent the method from being over-ridden?

Yes, just leave the class public and make the method sealed. (More...)

In which order the constructor is called for an inherited class?

Constructor of Parent class is called


Constructor of Child class (More...)

Are private class-level variables inherited?

Yes,private class members are inheritable, but they are not accessible (More...)

In WCF, suppose you have a derived class inherited from a datacontract class, will the derived class automatically have a datacontract as well ?

The Data contract is not inherited, so any derived class, would have to be explicitly declared as having a Data contract attribute as well.


What is the difference between a Struct and a Class?

The struct type is suitable for representing lightweight objects such as Point, Rectangle, and Color. Although it is possible to represent a point as a class, a struct is more efficient in some scenarios. For example, if you declare an array of 1000 Point objects, you will allocate additional memory for referencing each object. In this case, the struct is less expensive.

When you create a struct object using the new operator, it gets created and the appropriate constructor is called. Unlike classes, structs can be instantiated without using the new operator. If you do not use new, the fields will remain unassigned and the object cannot be used until all of the fields are initialized.

It is an error to declare a default (parameterless) constructor for a struct. A default constructor is always provided to initialize the struct members to their default values.

It is an error to initialize an instance field in a struct.

There is no inheritance for structs as there is for classes. A struct cannot inherit from another struct or class, and it cannot be the base of a class. Structs, however, inherit from the base class Object. A struct can implement interfaces, and it does that exactly as classes do.

A struct is a value type, while a class is a reference type. (More...)

Can we call a base class method without creating instance?

Its possible If its a static method.

Its possible by inheriting from that class also.

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What is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (More...)

Can code inside multiple catch block be executed?

No, Code can not execute in mutiple catch block (More...)

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