How to equal sub class from base class

[Steven.Xu]

I have an instance B of class C1. How can i let variable
BB which class inherits from C1 equal from B in VB.NET?

For example:

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as new C1;
Dim BB as CC1;

' How to realize BB = B?

End Sub

My mail address is: (e-mail address removed)

 

[One Handed Man [ OHM# ]]

If TypeOf CC Is BB

Regards - OHM

I have an instance B of class C1. How can i let variable
BB which class inherits from C1 equal from B in VB.NET?

For example:

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as new C1;
Dim BB as CC1;

' How to realize BB = B?

End Sub

My mail address is: (e-mail address removed)

 

[Codemonkey]

You can't assign a base class instance to a derived class instance because
the derived class hasn't been created, but you can do the opposite:

e.g.

------------------

Public Class C1
' ...
End Class

Public Class CC1
Inherits C1
' ...
End Class

Public Sub Main()
Dim B as C1
Dim BB as New CC1

B = BB

End Sub

-----------------

See http://tinyurl.com/39jju or

http://groups.google.com/groups?hl=...TF-8&q=assign+a+base+class+to+a+derived+class


for a longer explanation

 

[One Handed Man [ OHM# ]]

Damn, I missed the absence of the 'New' keyword. Well spotted CM.

Regards - OHM