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Windows Workflow Foudation (WF) Samples

Windows Workflow Foundation is a part of the .NET Framework 3.0 (and 3.5) that enables developers to create workflow enabled applications. This section contains articles, samples and presentations on this technology.


Books

Essential Windows Workflow Foundation chapter 3
This is chapter 3, focusing on activities.
Essential Windows Workflow Foundation by Dharma Shukla, Bob Schmidt
Published by Addison-Wesley Professional
ISBN: 0321399838; Published: 10/13/2006;

Professional WF Chapter 6
This 40-page chapter focuses on activities and activity development.
Professional Windows Workflow Foundation by Todd Kitta
Published by Wrox
ISBN: 9780470053867; Published: March 2007;

Technology Samples

Creating rules using the object model
This sample shows how to use the Windows Workflow Foundation (WF) Rules Object Model to create Rules directly using the APIs without using the designers. The rules created are then executed by the WF Rules Engine.

Custom rule actions
This sample shows how custom rule actions (derived from the RuleAction Type) can be defined and used in the Windows Workflow Foundation rules engine. Three sample rule actions are provided which demonstrate how to perform the following actions from a rule:
  1. Write text to the console
  2. Execute a RuleSet
  3. Queue an activity for execution

Custom rule expressions
This sample shows the definition and use of a custom expression in the Windows Workflow Foundation rules engine. Custom expressions are used to model specific predicate types or functions and can be used directly in the rules object model and editors

External ruleset toolkit
This sample was put together by the rules team to illustrate how rules can be externalized outside the workflow and live inside a SQL server. This also shows how to rehost the rules designer, and execute the rule set outside of a WF.

Hosting Workflows in Windows Services
Sample which shows how you can host a workflow inside of a windows service. More details available on his website here.

Policy from file
The custom PolicyFromFile activity can be used in any workflow project. At design time, the policy activity will read from a specified rules file, or if no .rules was defined, a default .rules file with the same name as the workflow file will be created. In order to define a .rules file, set the RulesFileName property to the .rules file you want to use. The property can be found when you add the policy activity to your workflow and select Properties from the context menu.

Processing XML in rules
This sample shows how the WF Rules Engine can be used to process rules on Xml Documents.

Rules-driven pageflow
Windows Workflow Foundation (WF) offers rules capabilities to the NetFx developer platform. RuleSets are collection of business rules with conditions and actions and they can be executed on any target object such as a Web application. In this sample we will show the stand alone functionality of rules in driving the page flow for a simple ASP.NET application.

Rules-driven UI
Windows Workflow Foundation (WF) offers rules capabilities to the WinFx developer platform. RuleSets are collection of business rules with conditions and actions and they can be executed on any target object such as a Windows Form. In this sample we will demonstrate this capability by using rulesets to pre-populate fields, do cross validation and various calculations on a target Windows Form. We will also show rules features such as forward chaining in this sample.

Ruleset analyzer
This sample uses the rules object model to analyze dependencies and execution plans for a ruleset. This is a useful sample to debug and diagnose a complex ruleset.

Rules in Excel
This sample shows how you can use Visual Studio 2008 to create an Excel application that allows you to edit and define your rules inside of Excel.

Rules with collection
This sample illustrates the execution of rulesets against a collection of objects. This makes use of the techniques outlined in the Windows SDK documentation filed in the Processing Collections.

WF Hands-On Lab-VB
A version of the hands on labs (HOL) for Windows Workflow Foundation that are written using VB.NET. This lab are identical to the C# versions available here. This contains the first three labs. They are suitable for the RTM version of Windows Workflow Foundation. The C# labs are also suitable for the RTM version even though the C# version currently specifies RC.

WF Workflow Manager (tracking/dynamic updates sample)
This application demonstrates how one can
1) enumerate and show to a user a list of live (currently executing) or tracked (executed in the past)
2) show current state of a workflow
3) control a workflow (suspend/resume/terminate)
4) change a worklfow from the UI

U-Serve Product Derby
The UServ Product Derby is an end-to-end scenario sample based on the UServ Product Derby Case Study used at the Business Rules Forum. In this sample, the WF Rules Engine is used to model the rules for some key scenarios in this case study and perform the processes in the company such as -
  • Verification and approval of a new client application
  • Determine the eligibility of a client to obtain vehicle insurance
  • Determine the Premium for Vehicle Insurance

Presentations

Building WF-Powered Services
This is a basic presentation I use for introducing the WF-WCF integration in the .NET 3.5.

What is the context of this conversation?
The .NET Framework 3.5 will introduce the functionality to call services from Windows Workflow Foundation (WF), and to expose workflows as a Windows Communication Foundation (WCF) service. A common pattern is to have a workflow serve as the coordinator between a number of other processes (including workflows). This talk will discuss how these conversations are implemented in WF, and common patterns for conversing over a long period of time, including asynchronous messaging, long-running cancellable work, managing m-of-n responses and check pointing of progress.

Demonstrating the New WF/WCF Content in Orcas with DinnerNow
This deck walks through a number of the new features for WF and WCF in the .NET Framework 3.5 including:
  • WF/WCF Integration
  • Syndication
  • JSON encoding for WCF
  • HTTP Programming Model
  • Partial Trust for WCF
This is discussed within the context of the DinnerNow demo.

WF Building Activities
An introductory deck on the idea behind activities and developing them

WF Rules Use and Extensibility
An introduction to developing using the rules engine inside Windows Workflow Foundation, including a tour of the programmatic extensibility mechanisms.
Last edited Nov 22 2008 at 4:39 AM  by CSimpkins, version 8
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