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().BaseType only gives me type that is directly inherited, and
i need to get the type(s) beyond that. Thanks!

 

[Jon Skeet [C# MVP]]

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().BaseType only gives me type that is directly inherited, and
i need to get the type(s) beyond that. Thanks!

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

Type x = c.GetType().BaseType.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]

Use IsSubclass method:

c.GetType().IsSubclassOf(typeof(A))

 

[hello_world]

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

 

[hello_world]

In fact my example is wrong, as you might have guessed 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]]

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

B: A
C: B

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

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]

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

 

[Ryan McFarren]

You can just use "is".

if (c is A)

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

c.GetType().BaseType.BaseType...