Interface defining a constructor signature?

by

You can’t. It’s occasionally a pain, but you wouldn’t be able to call it using normal techniques anyway.

In a blog post I’ve suggested static interfaces which would only be usable in generic type constraints – but could be really handy, IMO.

One point about if you could define a constructor within an interface, you’d have trouble deriving classes:

public class Foo : IParameterlessConstructor
{
    public Foo() // As per the interface
    {
    }
}

public class Bar : Foo
{
    // Yikes! We now don't have a parameterless constructor...
    public Bar(int x)
    {
    }
}

More Related Contents:

  1. How to avoid implementing methods repeatedly for identical classes?
  2. C# Interfaces. Implicit implementation versus Explicit implementation
  3. What’s the difference between an object initializer and a constructor?
  4. Understanding Covariant and Contravariant interfaces in C#
  5. Inheritance from multiple interfaces with the same method name
  6. C# Error: Parent does not contain a constructor that takes 0 arguments
  7. implicit vs explicit interface implementation [duplicate]
  8. What setup code should go in Form Constructors versus Form Load event?
  9. Constructor of an abstract class in C#
  10. C# – Cannot implicitly convert type List to List
  11. Interface or abstract class?
  12. Why are C# 4 optional parameters defined on interface not enforced on implementing class?
  13. Is there an alternative to bastard injection? (AKA poor man’s injection via default constructor)
  14. How can I use interface as a C# generic type constraint?
  15. The type ‘…’ has no constructors defined
  16. C# – Making all derived classes call the base class constructor
  17. When is using the C# ref keyword ever a good idea?
  18. Finding the Concrete Type behind an Interface instance
  19. Is the “textual order” across partial classes formally defined?
  20. Attribute on Interface members does not work
  21. what is ‘this’ constructor, what is it for
  22. Why are C# interface methods not declared abstract or virtual?
  23. Default Interface Methods. What is deep meaningful difference now, between abstract class and interface?
  24. How to inherit constructors?
  25. How can I implement static methods on an interface?
  26. Why we do create object instance from Interface instead of Class?
  27. Fluent NHibernate, working with interfaces
  28. Calling constructor from other constructor in same class
  29. When should we use default interface method in C#?
  30. Does VLC media player have a C# interface? [closed]

Leave a Comment