Foundations of WF: an Introduction to Windows Workflow by Brian Myers

By Brian Myers

Home windows Workflow starting place is an addition to the WinFx SDK designed to permit any program so as to add workflow performance. comparable in layout to WCF, home windows Workflow beginning is the infrastructure for developing workflows. Workflows are outlined both graphically utilizing the recent Workflow fashion designer, or in code. Microsoft expects workflow to be one of many subsequent most well liked themes inside program layout and improvement. This ebook is helping audiences simply starting their workflow layout efforts with WF. All code samples should be proven in either VB.NET and C# utilizing visible Studio 2005. This features a pattern ASP.NET software written in VB.NET that makes use of workflow and the home windows Workflow origin in addition to a home windows program written in C# that makes use of an analogous workflow.

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Extra resources for Foundations of WF: an Introduction to Windows Workflow Foundation (Expert's Voice in .Net)

Sample text

The reason for this is that state must change before control can move from one activity to another. vb file from the Solution Explorer. vb file for the Sequential workflow. vb is used to create the console application that’s hosting the workflow, this code won’t change depending on the workflow type (Sequential or State Machine) that you’re creating. A State Machine workflow is different from a Sequential workflow in that the first activity within a State Machine workflow must be a state. There must be a first state to begin the workflow, and the execution of the workflow is based on that first state.

CreateWorkflow(typeof(CFirstSequentialWFConsoleApplication. WaitOne(); First Workflow in VB This section will cover how to create your first workflow within VB. First we’ll look at the Sequential workflow, followed by the State Machine workflow. For each workflow type, I’ll walk you through how to add activities to a workflow and how to write code for activities within the workflow. Sequential Workflow With the built-in VS2005 Workflow Designers, creating a simple workflow is just a matter of drag and drop.

You’ll use this Delay activity to pause a set period of time before changing states. All this workflow is going to do is wait a set period of time, move to the next state, pause a set period of time, and then move to the completed state. fm Page 28 Thursday, September 14, 2006 5:58 AM 28 CHAPTER 2 ■ FIRST WORKFLOW Figure 2-9. EventDrivenActivity1 within the FirstState State activity Click the DelayActivity1 activity and open the Properties window. Find the Time Interval property—you’ll see this is a drop-down list.

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