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6722231
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2011-07-17T06:11:50.997
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2011-07-17T06:30:11.113
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text
Body
Likely what you want to do is really composition or aggregation ( see <a href="http://www.c-sharpcorner.com/uploadfile/pcurnow/compagg07272007062838am/compagg.aspx" rel="nofollow">here for design pattern</a>). Maybe you're defining a behavior. You can always implement an interface SomeInterface in the base class, have a member of type SomeInterface (which lets it be any class that implements SomeInterface and can hence have the code does the implementing), in the members constructor pass a reference to the base class that owns it if necessary (if doing so, try to add another interface to define the callbacks, the base class will implement it and the subclass will have it as the member variable type). Use calls to the member class to implement SomeInterface. This way the code is implemented in another class, which makes it easy to maintain, but you're not doing multiple inheritance. The idea behind composition is that an engine is not a car but a car has an engine. The car needs an engine, but doesn't need to know how a whole engine unit works, just how to interface with it. So the engine should not inherit from car. But having the car implement the engine is silly. So the car gets an engine as a member of the whole car, but as an object. The car has an engine as part of its composition. It sounds like what you are doing is more of a behavior, like a duck object that has a quack behavior, but rubber ducks are ducks but do not quack but squeak. So they differ from mallard objects, but both have many other duck features in common. So you want to have a quack interface that each implements differently. But many ducks will quack for this interface, so you don't want to have to write quack for each one. That's where you use composition to implement the quack behavior interface.
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1. POIs multiple inheritance possible in VB .Net?
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