Static class

arnab-jit · December 15th, 2010, 07:58 AM

Why we can not inherit static class??

samjudson · December 15th, 2010, 08:11 AM

I don't suppose the answer 'because its static' is enough for you huh?

You might as well ask, why can't I walk through this wall here - why do I have to use the door over there instead - well, because whoever designed the house put the wall there and the door over there for a reason.

arnab-jit · December 15th, 2010, 08:45 AM

Static means a class that have only static members and we can not create any object with that class. But the point is why Microsoft is not allowing us to extends the static class with another static class?

samjudson · December 15th, 2010, 10:00 AM

I know what static means. Microsoft (or any developer) makes a class static specifically because they don't want you to inherit from it.

So ask yourself why you want to inherit from a static class.

arnab-jit · December 16th, 2010, 02:09 AM

By inheriting a class we can create one or more specific functionality. For example 'Animal' to 'Dog'. But if the Animal and Dog class are static, then what will be the problem? Why we can not extends the static functionality?

One thing is that we can not create any object for static class. So by inheriting them we can not do any dynamic polymorphism with that. Brcause dynamic polymorphism is totally based on runtime object type. It will be a good reason to not allowinging static class in inheritence.

Am I right?

samjudson · December 16th, 2010, 03:46 AM

I'm still not 100% sure where you are coming from on this but I think you are over thinking it. You would never create a static class around a concept like 'Animal' or 'Dog' in the first place, as these are not static concepts.

whiterainbow · April 13th, 2011, 08:38 AM

The static means that it is non-changeable or non-moveable. So what you are going to do with the non-changeable members of a static class? Animals will have a lot of properties and the Dog will inherit a few properties of animal then why you are not using an interface to extend the properties of Animal. In any language, the static class is non-extendable...

arnab-jit · April 14th, 2011, 02:09 AM

Is there any relation between non-movable members / properies with inheritence?

whiterainbow · April 14th, 2011, 02:14 AM

Yes. Non-movable properties cannot be overridden... You just can use the functionality but not change the functionality...

MohamedHassanAli · May 24th, 2011, 01:20 AM

Quote:

Originally Posted by arnab-jit

Why we can not inherit static class??

Becoz they are Sealed and Abstract :)

static class stTest{}

Check the IL code for this
you will see the a static class in sealed and abstract