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We talked about WF4 Activity overview and WF parameters in particular in previous posts. In this installment, I'm going to focus on WF variables. Variable Variables are modeled by Variable class. namespace System.Activities { public abstract class Variable : LocationReference { public ActivityWithResult...

We are happy to announce that we have released the WF ADO.NET Activity Pack CTP1 on CodePlex . The WF ADO.NET Activity Pack CTP1 contains a set of WF 4 Activities based on .NET Framework Data Providers . These activities enable accessing a database through SQL commands or stored procedures within a workflow...

In the 1st segment , I talked about high level principle for WF4’s data model design. I’m going to talk about WF Argument in particular in this post. Argument We’ve briefly touched this before: in WF4, arguments are modeled by Argument class. namespace System.Activities { public abstract class Argument...

In previous blogs , we went through how define an Activity’s execution logic. But this is not enough. To build any meaningful Activity, developers also need to the activity’s state and data flow. In this post, I’m going to talk about WF4’s Activity data model. Argument and Variable 101 WF is just another...

In previous post I introduced WF 4's Activity model. In this section, I'm going to use 2 samples to demo 4 styles to create a custom Activity . How to build a leaf activity – HttpGet Today HTTP based RESTful services are getting popular, so it might be useful to perform some basic HTTP operations...

Workflow as Activities If you have programmed with Windows Workflow Foundation (WF) , you should be very familiar with Activities . In WF , programs are defined by a tree of Activities . Some Activities are used to control the flow of program, like Sequence , If , and While ; some Activities perform...

A new programming language Windows Workflow Foundation (WF) 4.0 offers many features to simplify business application development, deployment and management. In this post I’d like to explore workflow from a developer’s angle as a new programming language. WF has a lot of “new” features compared to mainstream...