Krzysztof Cwalina

Designing Reusable Frameworks

April, 2008

Blog - About

About Krzysztof Cwalina

Krzysztof Cwalina is a Principal Architect on the .NET Framework team at Microsoft. He started his career at Microsoft designing APIs for the first release of the Framework. Currently, he is leading the effort to develop, promote, and apply the design guidelines to the .NET Framework. He is a coauthor of Framework Design Guidelines (Addison-Wesley, 2005). Reach him at his blog at

  • Krzysztof Cwalina

    Managed Extensibility Framework

    Several months ago we formed what we call Application Framework Core team. The charter of the team is to play the same role in the application frameworks space (WinForms, ASP.NET, WPF, Silverlight) as the Base Class Libraries (BCL) team plays at the bottom...
  • Krzysztof Cwalina

    Framework Design Guidelines Digest v2

    Almost 4 years ago, I blogged about Framework Design Guidelines Digest . At that time, my blog engine did not support attaching files and I did not have a convenient online storage to put the document on, and so I asked people to email me if they want...
  • Krzysztof Cwalina

    Simulated Covariance for .NET Generics

    I just wrote this pattern, but I am not sure if I should add it officially to the Framework Design Guidelines. It seems like a bit of a corner case scenario, though I do get questions about it from time to time. Anyway, let me know what you think. ...
  • Krzysztof Cwalina

    Framework Design Studio Released

    When I was coming back from Mix 2007, I was bored on the plane and so started to write a dev tool. What a geeky thing to do on a plane. :-) The tool allows comparing two versions of an assembly to identify API differences: API additions and removals...
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