Why do abstract classes need to implement interface members?#

Why can't I do this in C#: 

public abstract class Base : ISerializable { }
The compiler complains that Base doesn't implement the methods necessary for the ISerializable interface. But who cares, it's an abstract class - it's not supposed to implement all members. It would make sense to me to be able to require that derived classes of my base class implement certain interfaces but without providing abstract methods for all of their members already.

Now I have to go: 

public abstract class Base : ISerializable
{
    public abstract void GetObjectData(SerializationInfo info,
StreamingContext context);
}
which is pretty lame if you need to do this for a number of methods or interfaces...

Blog | Programming | .NET
Monday, October 20, 2003 1:05:11 PM (Romance Standard Time, UTC+01:00) #    Comments [1]  | 
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Thursday, May 03, 2007 12:16:10 PM (Romance Standard Time, UTC+01:00)
Hi!

I agree. Let's say that interface A has three methods:

interface A { void A(); void B(); void C() }

and in your abstract base you only implement method A and B:

class Base
{
public void A(){...}
public void B(){...}
public abstract void C();
}

Since you want your subclasses to reuse A and B and have various implementation for each subclass for method C then this make sense. The interface will be used to expose the class to the consumer code, so it will not know what instance it is invoking methods on.

I cannot understand why this is not possible in C#, it sure is in Java.
Steinar | s_dragsnesAT NOSPAMhotmail dot com
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