Inheritance
Generic types can be inherited, but some basic rules apply. For example, the derived class cannot be a closed constructed type. Table 7-1 lists all the possible permutations.
Table 7-1. Inheritance table for generic types
Base class | Derived class | Comments |
|---|---|---|
Generic (open) | Generic (open) | Permitted when the derived class uses the type parameters of the base class |
Generic (open) | Generic (closed) | Not permitted |
Generic (open) | Non-generic | Permitted |
Generic (closed) | Generic (open) | Permitted |
Generic (closed) | Generic (closed) | Not permitted |
Generic (closed) | Non-generic | Not permitted |
Non-generic | Generic (closed) | Permitted |
Non-generic | Generic (open) | Not permitted |
This sample code shows some of the combinations that are permitted and not permitted:
public class ZClass<T> { } ...Get Programming Microsoft® Visual C#® 2008: The Language now with the O’Reilly learning platform.
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