Skip to Content
Professional Visual Basic® 2010 and .NET 4
book

Professional Visual Basic® 2010 and .NET 4

by Bill Sheldon, Billy Hollis, Jonathan Marbutt, Gastón C. Hillar, Rob Windsor, Kent Sharkey
May 2010
Beginner
1319 pages
45h 35m
English
Wrox
Content preview from Professional Visual Basic® 2010 and .NET 4

Appendix C. Workflow 2008 Specifics

As discussed in Chapter 26, Windows Workflow Foundation (WF) has changed substantially in the .NET Framework 4. The models used to organize your workflows have changed, and many of the older activities do not have counterparts in the new version. This appendix discusses the version of WF supported by the .NET Framework versions 3.0 and 3.5 (i.e., Visual Basic 2005 with .NET Framework 3.0 and Visual Basic 2008). This information is retained in this edition for those users who still need to maintain existing WF solutions using these older versions. For new applications, the new model is highly recommended. Here, the older style of building workflows is called Windows Workflow Foundation 3.x (or just WF 3.x).

BUILDING WORKFLOWS

The actual workflow files in WF 3.x are XML files written in a version of XAML. This is the same XAML used to describe Windows Presentation Foundation (WPF) files. (See Chapter 17 for more details on WPF.) They describe the actions to perform within the workflow, and the relationship between those actions. You can create a workflow using only a text editor, but Visual Studio makes creating these workflows much easier. It provides a graphical designer that enables developers to visually design the workflow, creating the XAML in the background. The following code shows a section of the XAML for a workflow:

<RuleDefinitions xmlns="http://schemas.microsoft.com/winfx/2006/xaml/workflow"> <RuleDefinitions.Conditions> <RuleExpressionCondition ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

Read now

Unlock full access

More than 5,000 organizations count on O’Reilly

AirBnbBlueOriginElectronic ArtsHomeDepotNasdaqRakutenTata Consultancy Services

QuotationMarkO’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
QuotationMarkI wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
QuotationMarkI’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
QuotationMarkI'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Mark W.
Embedded Software Engineer

You might also like

Pro VB 2010 and the .NET 4 Platform

Pro VB 2010 and the .NET 4 Platform

Andrew Troelsen, Vidya Vrat Agarwal
Professional Visual Basic® 2008

Professional Visual Basic® 2008

Billy Hollis, Bill Evjen, Kent Sharkey, Bill Sheldon

Publisher Resources

ISBN: 9780470502242Purchase book