Partial implementation of interface

[Advait Mohan Raut]

Hello friends,
I am new to C#. I have some fundamental doubt. Please, try to answer
it.

1) Ltes say, IFace is an interface which has proto of two methods.
class A implements IFase.

interface IFace
{
void func1(...) {.....}
void func2(...) {.....}
}

class A : IFace
{
void func1(...) {.....}
void func2(...) {.....}
}

class B : A, IFace
{
....
}

Now the question is, in the defination of class B is it neccesory to
implement all two members of IFace. I dont want to change defination
of func1( ) which is from A to B. Or implementation of only one will
solve the problem ?

[Nicholas Paldino [.NET/C# MVP]]

Re: Partial implementation of interface

Advait,

Class B, if it does not define anything else, will implement the
interface IFace (you shouldn't need it in the declaration of B, as a matter
of fact).

If you want to provide an implementation of one of the methods defined
in IFace, then you will need to declare the methods in A as virtual, so that
B can override them.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Advait Mohan Raut" <advait.m.raut@ gmail.comwrote in message
news:1190387698 .519646.325470@ t8g2000prg.goog legroups.com...

Hello friends,
I am new to C#. I have some fundamental doubt. Please, try to answer
it.
>
1) Ltes say, IFace is an interface which has proto of two methods.
class A implements IFase.
>
interface IFace
{
void func1(...) {.....}
void func2(...) {.....}
}
>
class A : IFace
{
void func1(...) {.....}
void func2(...) {.....}
}
>
class B : A, IFace
{
...
}
>
Now the question is, in the defination of class B is it neccesory to
implement all two members of IFace. I dont want to change defination
of func1( ) which is from A to B. Or implementation of only one will
solve the problem ?
>

[Advait Mohan Raut]

Re: Partial implementation of interface

On Sep 21, 8:24 pm, "Nicholas Paldino [.NET/C# MVP]"
<m...@spam.guar d.caspershouse. comwrote:

Advait,
>
Class B, if it does not define anything else, will implement the
interface IFace (you shouldn't need it in the declaration of B, as a matter
of fact).
>
If you want to provide an implementation of one of the methods defined
in IFace, then you will need to declare the methods in A as virtual, so that
B can override them.
>
--
- Nicholas Paldino [.NET/C# MVP]
- m...@spam.guard .caspershouse.c om
>

But is it possible that, a method delared in an interface to be
implemented as virtual ?

[Jon Skeet [C# MVP]]

Re: Partial implementation of interface

Advait Mohan Raut <advait.m.raut@ gmail.comwrote:

Than you, Nicholas Paldino for the nice information. Actuly I came to
conclusion the one cannot override selected methods of the interface,
because in the offline help of VS 2005 (i.e. C# Reference) they have
stated that 'override' will work only if the base class proto is
either 'override' or 'abstract' or 'virtual' .

But when you implement it in the base class you can make it virtual or
abstract. If you do that, you can override it in the derived class.

--
Jon Skeet - <skeet@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too