Delving Deeper into Interface-Based Programming - Interfaces and Partial Types

(Page 2 of 4 )

Partial types allow the component architect to define interface derivation for a class but have another developer implement it (similar to the old C++ distinction between header files and CPP files):

  //In App.cs
  public interface IMyInterface
  {
    void Method1();
    void Method2();
  }

  public partial class MyClass : IMyInterface
  {}

  //In MyClass.cs

  public partial class MyClass
  {
    public void Method1()
    {...}
    public void Method2()
    {...}
  }

With a partial class, each part of the class can choose to add interface derivation, or interface derivation and implementation:

  public partial class MyClass
  {}

  public partial class MyClass : IMyInterface
  {
    public void Method1()
    {...}
    public void Method2()
    {...}
  } 

However, only a single part can implement an interface member.

Next: Implementing Multiple Interfaces >>
 

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This article is excerpted from chapter three of Programming .NET Components, Second Edition, written by Juval Lowy (O'Reilly, 2006; ISBN: 0596007620). Check it out today at your favorite bookstore. Buy this book now.