inheriting more than once [RESOLVED]

[Andy]

I know you can't inherit but once in a class. what's a workaround to include several other classes into one class? I have some classes that work great by themselves and I need those same exact properties to be included in an entirely different class though.

other than re-writing the properties and methods, IS there a better way?

[Memnoch1207]

You can create many classes (as well as nested classes) within a single class (.vb) file.

[Andy]

where do I find info on nested classes? I've never heard of that one

[PT Exorcist]

Nested classes are just classes inside classes. They dont provide any extra functionalitty.

[taxes]

Hi,

"where do I find info on nested classes? I've never heard of that one "

Whilst "Nested" or "Sub Classes" does describe the practical relationship, the official term is "Class Hierarchies". Check it out in MSDN Help.

[Andy]

I will check that out. But I'm thinking that's not going to help in my situation. I was thinking of creating classes that contained itty bitty pieces of data and combine ALL of them to create one gigantic, useful class:

public class whatever
 
inherits oneClass
inherits anotherClass
inherits yetAnotherClass
 
'This way, the "Whatever" class won't have to be duplicating the other classes.

Unfortunately, you can't inherit more than once. Why is that?

[taxes]

Hi,

"Unfortunately, you can't inherit more than once. Why is that?"


The responses have all misunderstood your meaning. We thought you were saying that you could not inherit more than once. What you mean is that you cannot inherit from more than one class. That is the present situation with .NET. You COULD inherit from multiple classes in C++ but not in any of the .NET languages. I thought I read in a previous post that this will change in a future version.

[Memnoch1207]

Each class would just inherit from its parent, which in turn would inherit from its parent, etc...

Public Class1 [color=red](Base Class)[/color]
   'some code
End Class
 
Public Class2 
   Inherits Class1
   
   'Inherits all functionality of Class1
End Class
 
Public Class3
   Inherits Class2
 
   'Inherits all functionality from Class2 AND Class1
End Class
 
Public Class4 
   Inherits Class3
 
   'Inherits all functionality from Class3 AND Class2 AND Class1
End Class

Public Class MyClass
   Inherits Class4
 
   'Inherits functionality from ALL 4 Classes
End Class

[taxes]

Hi Phantom,

Thinking about it, you could possibly achieve what you want with a little effort.

Say you have fcls1, fcls2, fcls3, each one designed as a base class form, inheriting from System.Windows.Forms.Form.

Say you then decided you wanted to combine all their objects etc.
How about amending the inheritance statement in fcls2 to

Inherits fcls1.

Then change the inheritance statement in fcls3 to

Inherits fcls2

If at any time you wanted to revert to the original form states, alter the inheritance statments back to

System.Windows.Forms.Form

I emphasise that I have not tried this!!!!

EDIT It looks as if you can't change them back to

System.Windows.Forms.Form

because they retain their acquired objects.

[Andy]

interesting, interesting...I'll give those suggestions a go around..or as my project leader likes to say" Jack with it for a while"