Design Pattern for deriving multiple classes of com object

Question

Hi Guys I am developing an application which uses a com dll. The com dll provides 2 classes which inherit from another class. Class B inherits from A Class C inherits from A I'm looking for a design pattern and an example how to implement my problem. The 2 derives classes are very similar and have the same properties and methods for 95%. So I would like to create ONE new derived class E (for both B and C) in my project which also have the same methods and properties for 95%. I do not want to write all functions twice for each class I inherit. So I want class E to figure out if its derived from B or C. What would be the best way to solve this using maybe a design pattern and can you please provide a short example. Thanks William

Pranay Rana · Answer

I suggest you make use of Adapter Design pattern. Adapter Desing pattern is one of GOF patter which used for this purpose only. Adaper Design patter conver incompatible interface in the compatible interface . for you it will be like public interface IAdapter { returntype PerformAction(); } public Class Adapter : IAdapter { private readonly ThirdpartyDLLClass ClassA; public Adaper { ClassA = new ClassA(); } public returntype PerformAction() { return ClassA .MethodA(); } } And make use of this Adapter class.

Upendra Pratap Shahi · Answer

Read this and imlement according to this principle.

Pranay Rana · Answer

Dont forget to mark it accepted

William van Aert · Answer

Thank Pranay  I will give it a try.

Pranay Rana · Answer

I dont know how come SOLID Princple is going help here .. because he is reuesting for the pattern not principle.

Upendra Pratap Shahi · Answer

Hello  Read below article- http://www.c-sharpcorner.com/UploadFile/damubetha/solid-principles-in-C-Sharp/