Yun Jin's WebLog

CLR internals, Rotor code explanation, CLR debugging tips, trivial debugging notes, .NET programming pitfalls, and blah, blah, blah...

April, 2010

  • Yun Jin's WebLog

    Workflow Foundation 4.0 Activity Data Model (III)

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    I finally finished the long overdued last installment of the Activity Data Model series . In this post, I focused on workflow variables. Conceptually workflow variables are very similar to variables in procedure programming languages like C#. But one...
  • Yun Jin's WebLog

    The first wave of WF4 Activity Packs are released

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    I'm very happy to annouce that my team just released 2 pack of Activities for WF4 on CodePlex ! · State Machine Activity Pack . State Machine is one of the most common asks for WF4’s Activity Palette, especially for WF3 users. This Activity Pack includes...
  • Yun Jin's WebLog

    Workflow Foundation 4.0 Activity Data Model (II)

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    Here comes sequal of my WF4 Activity Data Model blog . This post focuses on WF arguments: the Argument class hierarchy which models arguments for WF; how to "declare" an argument for an activity; the automatic reflection; how to deal with dynamic arguments;...
  • Yun Jin's WebLog

    Workflow Foundation 4.0 Activity Data Model (I)

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    This is my first post about WF4's Activity Data Model . The focus of this post is a high level principle which drives data model redesign between WF3 and WF4: separation of data and program. WF3 has Activity's runtime state stored in the Activity itself...
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