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► KB ► To/From Guides ► C#

Interface (C# and Access VBA Cross Reference Guide)

By Mike Prestwood

C# versus Access VBA: A side by side comparison between C# and Access VBA.

OOP Details

More object oriented (OO) stuff.

Interface

[Other Languages]

An element of coding where you define a common set of properties and methods for use with the design of two or more classes.

Both interfaces and abstract classes are types of abstraction. With interfaces, like abstract classes, you cannot provide any implementation. However, unlike abstract classes, interfaces are not based on inheritance. You can apply an Interface to any class in your class tree. In a real sense, interfaces are a technique for designing horizontally in a class hierarchy (as opposed to inheritance where you design vertically). Using interfaces in your class design allows your system to evolve without breaking existing code.

C#: "Interfaces" interface

Classes and structs can inherit from interfaces in a manner similar to how classes can inherit a base class or struct, but a class or struct can inherit more than one interface and it inherits only the method names and signatures, because the interface itself contains no implementations.

class MyClass: IMyInterface

  public object Clone()
  {
  return null; 
  }


// IMyInterface implemented here...
}

Syntax Example:

interface IMyInterface

  bool IsValid();

C# Interfaces (interface)

Access VBA: "Interfaces"

Same as in VB6. Access VBA has limited support for interfaces. You can create an interface of abstract methods and properties and then implement them in one or more descendant classes. It's a single level implementation though (you cannot inherit beyond that). The parent interface class is a pure abstract class (all methods and properites are abstract, you cannot implement any of them in the parent class).

In the single level descendant class, you have to implement all methods and properties and you cannot add any. Your first line of code is Implements InterfaceName.

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