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 of “public” versus “implementation” variables. “Public” variables means variables defined by…

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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 action, exit action, conditional transition, nested state,…

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Workflow Foundation 4.0 Activity Data Model (II)

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; what does expressions mean for WF; how to bind arguments to expressions; activity…

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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 concept like Argument and Variable and…

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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 and NativeActivity.

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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, AsyncCodeActivity, and NativeActivity) for 4 different programing style (from fully decarlative…

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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.

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Hello world, again

I’ve disappeared for more than 4 years in blog space. During this time period, I left CLR team and worked for Microsoft’s High Performance Computing (HPC) team for 3 years to build Windows based compute cluster infrastructure. One thing I’m particularly proud of is that in Super Computing 2008, a system powered by our product…

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