Question

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Interface defining a constructor signature?

I have a mixed hierarchy of classes and interfaces.

For using serialisation I need a default constructor present in
each class. I would really aprreciate if the compiler could tell
me that a default constructor is missing somewhere in the hierarchy.
(seeing the problem at compile time, not in the later tests)

What I would like to have could be some markup or attribute,
but I could not find anything.

Something like:

[ForceDefaultConstructor]
interface IVeryQuickSerializable
{   
    Serialize();
    Deserialize();
}

would be great!

But anything like that is very appreciated.

There is a limitation: I cannot change the Serialisation.
Making it generic would solve the problem, but I do not have
the source. Writing a wrapper might do the job, but it will
have a loophole for objects deriving from the toplevel Serialisation
interface (which may not be altered).

Answer 1

You can’t do that in an interface or attribute.

Two thoughts:

• integration test: use reflection to find all relevant classes, and check them in a test

• expose your serialization code in a generic API that uses the T : new() clause, i.e.

  void Serialize<T>(T obj, ...) where T : IVeryQuickSerializable, new()