Does the interface servers all the needs of multiple inheritance?

[Mic Mathi]

I faced a situation that needs a multiple inheritance. Unfortunately .net is not supporting it. I cannot use an "interface" for this purpose. Let me tell you the scenario. I have a data layer class say "clsDL". There is another class for the common functions say "clsCommon"(It is common for all modules). I have several modules in my project (several projects in a solution) each module has its own common class for the common functions in that moule. Every form in the GUI layer has a class in Business layer. The data layer class inherited to "clsCommon" and all the common classes for each module. Now i want to inherite the "clsCommon" and the common class for the particular module into a particular business layer class. I don't want to merge the common functions. If i implement the interface, I have to make an interface for anyone of the two common class and declare the object of that interface class in the business layer class. The problem is that the functions are in these common classes is not same. Therefore, I can't take the advantage of "interface". How can I solve the problem? P.S: Sorry if I make you confused!

Ken,Mexico(Guanajuato)

[Christian Graus]

Ken.Hamilton wrote:

Every form in the GUI layer has a class in Business layer.

This doesn't make sense, and ties the two layers too closely together.

Ken.Hamilton wrote:

Now i want to inherite the "clsCommon" and the common class for the particular module into a particular business layer class.

This sounds convoluted and messy. Why would your data layer and business layer have the same base class ? The answer is to redesign, this doesn't sound at all right to me.

Christian Graus - Microsoft MVP - C++ "I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

[Mic Mathi]

Yes i think so. I am sad that my all works become useless. I have work again from the scratch. Can you please give me any useful links of articles about this subject? Thank you

Ken,Mexico(Guanajuato)

[Christian Graus]

Not off hte top of my head. Just remember, the layers are seperate, they shouldn't have any need for any common base classes, and the business layer should be built around the different business objects, not the different pages.

Christian Graus - Microsoft MVP - C++ "I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

[Mic Mathi]

Ok. Even though I didn't fully understand what you trying to say, thanks for your response and the time to spend me. :) Now I am going to sit back and starting to learn what is Data layer, what is Business layer from all the possible resources.

Ken,Mexico(Guanajuato)