Inheritance question

[hello_world]

Let's say I have the following class hierarchy:

A: B
B: C

I would like a means to test whether class C is a 'descendant' of class
A (or A is the 'ancestor' of C). If c is the instance of C,
c.GetType().Bas eType only gives me type that is directly inherited, and
i need to get the type(s) beyond that. Thanks!

[Jon Skeet [C# MVP]]

Re: Inheritance question

hello_world wrote:[color=blue]
> Let's say I have the following class hierarchy:
>
> A: B
> B: C
>
> I would like a means to test whether class C is a 'descendant' of class
> A (or A is the 'ancestor' of C). If c is the instance of C,
> c.GetType().Bas eType only gives me type that is directly inherited, and
> i need to get the type(s) beyond that. Thanks![/color]

Well, you can use BaseType on the the type returned by
GetType().BaseT ype of course:

Type x = c.GetType().Bas eType.BaseType

You might want to look at the "is" and "as" operators though for most
of the problems you'll run across when you want to know this kind of
thing.

Jon

[Yury.Korolev@gmail.com]

Re: Inheritance question

Use IsSubclass method:

c.GetType().IsS ubclassOf(typeo f(A))

[hello_world]

Re: Inheritance question

Thanks for your input; that's exactly what i wanted!

[hello_world]

Re: Inheritance question

In fact my example is wrong, as you might have guessed :P It should
have been:

B: A
C: B

Thanks again, i'll use the IsSubclass method - it will surely do the
trick!

[Jon Skeet [C# MVP]]

Re: Inheritance question

hello_world wrote:[color=blue]
> In fact my example is wrong, as you might have guessed :P It should
> have been:
>
> B: A
> C: B
>
> Thanks again, i'll use the IsSubclass method - it will surely do the
> trick![/color]

Unless you've actually got the *types*, using "is" or "as" will be a
lot faster, and more obvious in terms of meaning too:

if (c is A)

or

A x = c as A;
if (x != null)
{
// Work with x here
}

Jon

[hello_world]

Re: Inheritance question

Thanks Jon, i'll give it a try - it seems less expensive in terms of
calls to methods.

[Ryan McFarren]

Re: Inheritance question


You can just use "is".

if (c is A)

Or, if you really want, you can keep digging down the descendent chain:

c.GetType().Bas eType.BaseType. ..
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