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State Machines In Windows Workflow

A new article on OdeToCode: State Machines In Windows Workflow. State machines have been a powerful abstraction in software for many years. Using a state machine in Windows Workflow means we get all the tracking, persistence, and meta-data support the workflow runtume offers, which is quite a bonus.

The state machine designer

Print | posted @ Sunday, September 24, 2006 5:46 PM

Comments on this entry:

Gravatar # re: State Machines In Windows Workflow
by Lars Klitgaard at 9/27/2006 1:39 PM
This walkthrough was extremely informative to me. I am a novice programmer currently looking into .NET 3.0 to see what it can do for me when creating the new application, I am heading for.
This explanation has a clear goal and cuts all the technical details and extreme usage scenarios away and only describes the basic therminology and behavior from a common-known, simple example - and it does it at a speed and level so even I feal confident with it.
Good job !
  
Gravatar # re: State Machines In Windows Workflow
by Francesco at 9/27/2006 2:52 PM
Hi Scott,

We added your nice (as usual) article to the WF Section of NetFXGuide.

Best,
NetFXGuide.com
  
Gravatar # re: State Machines In Windows Workflow
by Pete at 10/8/2006 3:00 PM
Can I get the code associated with this article (please)?
  
Gravatar # re: State Machines In Windows Workflow
by scott at 10/9/2006 11:19 AM
Pete: Send me an email (scott at odetocode.com)
  
Gravatar # re: State Machines In Windows Workflow
by Jay at 10/10/2006 10:19 AM
Scott, this is nice one. I have a query similar on this line, if you can guide me.

I have already running a bug tracking system which is non windows workflow based.

If I want to implement such bug tracking system using windows workflow, how should I handle my earlier bugs which have their own states (e.g. Open/ Resolved/ Need more clarification/ Closed) while creating this workflow based bug tracking system?
  
Gravatar # re: State Machines In Windows Workflow
by scott at 10/10/2006 2:56 PM
Jay:

You can force a state using the StateMachineInstance class. After you start the workflow, create a new instance (StateMachineWorkflowInstance instance =
new StateMachineWorkflowInstance(runtime, instanceID)) and use the SetState method. It's like an administrative override.
  
Gravatar # re: State Machines In Windows Workflow
by Rahul Jain at 11/2/2006 2:52 PM
This article is really kool man :)


Thanks,
Rahul Jain
  
Gravatar # re: State Machines In Windows Workflow
by George at 11/7/2006 9:59 PM
This was a great summary !!!
Great example topic too because every engineer is familiar with all the states of a bug.

Thanks
  
Gravatar # re: State Machines In Windows Workflow
by Mswlogo at 11/10/2006 11:11 PM
Scott,

After looking a little more closely I'm a bit confused why you call the last part of your article Hierarchical State Machines. If it was truely hierarchical how would one introduce yet a third level. It appears to allow you to inherit one level of event handling from a base "group of events", and that's it. It's definitely useful, but I don't think it's called hierarchical state machines.

I'd like to understand how hierarchical state machines could be built with WF (if it's even possible).
  
Gravatar # re: State Machines In Windows Workflow
by Harlan at 10/16/2009 7:26 AM
Excellent!
  
Gravatar # re: State Machines In Windows Workflow
by GCoder at 11/17/2009 4:38 PM
Do you have the source code for the article?
  
Gravatar # re: State Machines In Windows Workflow
by scott at 11/17/2009 9:36 PM
http://odetocode.com/download/workflowprojects.zip
  
Gravatar # re: State Machines In Windows Workflow
by Kalyan at 12/9/2009 3:40 AM
Hi,

This is very usefull article, can you please send me the source code.

Thanks and Regards
  
Gravatar # re: State Machines In Windows Workflow
by Kalyan at 12/9/2009 6:24 AM
Hi Scott,

Can you please check the link, it is not working.

Thanks and Regards,
Kalyan
  
Gravatar # re: State Machines In Windows Workflow
by ruwanthaka at 12/15/2009 1:12 AM
yes, looks like it's not working!
  
Gravatar # re: State Machines In Windows Workflow
by Tiju at 12/22/2009 5:39 AM
good job.
  
Gravatar # re: State Machines In Windows Workflow
by Sandeep at 1/19/2010 7:15 AM
Hi Scott,
this is a very useful article for WF. thank you very much for writing and sharing such a valuable article.
  
Gravatar # re: State Machines In Windows Workflow
by Om at 1/31/2010 6:10 AM
Hi,
I was looking from last few months,what are uses of WWF and how to implement it. but only this artical answered all my quries regarding Workflow.
Great work........
  
Gravatar # re: State Machines In Windows Workflow
by Muruganandam Selvaraj at 2/15/2010 1:18 PM
Hi Scott,

http://odetocode.com/download/workflowprojects.zip

This link not working. where I can download source code for this article?. Please help me.
  
Gravatar # re: State Machines In Windows Workflow
by Muruganandam Selvaraj at 2/15/2010 1:18 PM
Hi Scott,

http://odetocode.com/download/workflowprojects.zip

This link not working. where I can download source code for this article?. Please help me.
  
Gravatar # re: State Machines In Windows Workflow
by Labhesh at 2/22/2010 12:57 AM
Hi,
I have some problem with sequention workflow. could you please help.
Hi,
I am deploying my workflow on custom list. this workflow runs on custom content type which is inheritaing from windows task content type.

but when I am trying to run this workflow it is showing error , till add & I run Sharepoing inbuild workflow. like approval or something else workflow.

why my workflow is dependent on sharepoint in-build workflow. ??

Help please.
tx
Labhesh


  
Gravatar # re: State Machines In Windows Workflow
by Gayathri Natarajan at 2/22/2010 6:06 AM
really superb article.i too want the example something like that.

can u give me the full code of this example.
  
Gravatar # re: State Machines In Windows Workflow
by Rene Incer at 3/3/2010 1:38 PM
Nice Article!!
State Machine are explained so plenty.
Only one question...
How can you do to inheritance event driven to certain States and not all? (that was you did in the last part of example)
  
Gravatar # re: State Machines In Windows Workflow
by Deepthi at 3/5/2010 2:08 AM
This is very good article. can you please send me the source code.
In our project the host is asp.net website.
when i try to call more than one methods(communication by local service)
under one button click event ,error occurs like below

Event "Insert" on interface type "statemachine.Interface1" for
instance id "8dfec02f-7395-4f9c-b3a6-a410cddaefb9" cannot be delivered.

Is it possible to call more than one methods in one click event?
  

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