Help with the difference between "Implements" and "Inherits"

[Tom P.]

What would the difference be between the following two:

public class Foo : IList<string>
{
....
}

public class Foo : List<string>
{
....
}

Thanks,
Tom P.

[Adam Clauss]

In the first one, Foo would have to manually implement all the members
defined by IList<string>.

In the second one, Foo would already come complete with all the
implementation that exists in List<string>, and you could just add
additional functionality on top of it.

--
Adam Clauss
"Tom P." <pa***********@gmail.comwrote in message
news:01**********************************@w1g2000p rk.googlegroups.com...

What would the difference be between the following two:

public class Foo : IList<string>
{
...
}

public class Foo : List<string>
{
...
}

Thanks,
Tom P.

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

Tom P. wrote:

What would the difference be between the following two:

public class Foo : IList<string>
{
...
}

public class Foo : List<string>
{
...
}

The first only inherit the interface. The second inherit
only the interface and the implementation.

But I would be careful with the second - it is easy to
become coupled with the internals of List.

Arne

[Abhijit Taur]

When a class (type) is derived from another class(type) such that it inherits all the members of the base type it is Implementation Inheritance.
When a type (class or a struct) inherits only the signatures of the functions from another type it is Interface Inheritance.
In general Classes can be derived from another class, hence support Implementation inheritance. At the same time Classes can also be derived from one or more interfaces. Hence they support Interface inheritance.
Source: Exforsys

[Marc Gravell]

(implementation and interface inheritance)

And your point?

Marc