Yun Jin's WebLog
CLR internals, Rotor code explanation, CLR debugging tips, trivial debugging notes, .NET programming pitfalls, and blah, blah, blah...
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.NET programming gotcha and debugging tips
CLR internal and Misc
Go with the flow
Rotor code explanation
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Yun Jin's WebLog
go with the flow
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Workflow Foundation 4.0 Activity Data Model (III)
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 thing special about workflow variables is the concept...
28 Apr 2010
The first wave of WF4 Activity Packs are released
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 a feature-rich State Machine supporting entry...
25 Apr 2010
Workflow Foundation 4.0 Activity Data Model (I)
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 which caused a lot of problems. WF4 abstracts out...
5 Apr 2010
Workflow Foundation 4.0 Activity Model (II)
I just posted the 2nd half of introduction to WF4's Activity Model . In this blog, I have given examples of building 2 activities with 4 different authoring styles: how to build a leaf activity (HttpGet) using CodeActivity and AsyncCodeActivity; and how to build a composite activity (World) using Activity...
1 Feb 2010
Workflow Foundation 4.0 Activity Model (I)
I just posted one entry in our "Go with the Flow" team blog to explain Workflow foundation V4's Activity Model. In the blog, I discussed how Workflow is composed of Activities and introduced basic Activity programming model in WF4. I quickly went over the 4 Activity base classes ( Activity, CodeActivity...
25 Jan 2010
A developer's view of Workflow
This is my first blog post about Windows Workflow Foundation (WF) on the "Go with the flow" team blog . In the post I briefly described some key benefits of Workflow as a programming language: Declarative programming, Continuation, Persistence, and instance management.
14 Jan 2010
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