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Tuesday, September 16, 2008 11:32 PM

It is time for a change

After 8 years working on BizTalk and Windows Workflow Foundation I have decided it is time to work on testing a new product. Starting yesterday I am now working on the Live Mesh team. I really enjoyed helping answer questions and putting together samples
Posted by tomlake | 0 Comments
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Monday, December 10, 2007 9:08 AM

Are you getting a "The root activity type is invalid" error with the Custom Activity Designer sample?

Several peolple have gotten a "The root activity type is invalid" error when using the Custom Activity Designer sample that can be found at http://wf.netfx3.com/files/folders/activity_behavior/entry840.aspx . I created an update project that should resolve
Posted by tomlake | 0 Comments
Attachment(s): FlowChart.zip
Monday, January 29, 2007 12:00 AM

State machine workflow web service example

Being able to have a StateMachineWorkflow hold state across multiple different web service calls can be very useful. This example will show you how to get start. The first step is to create your interface. For this example I will be using the following:
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Attachment(s): StateMachineWebServiceExample.exe
Thursday, October 19, 2006 11:44 AM

How to use custom ActivityCondition or filter which ActivityConditions are available

If you have your own custom ActivityCondition you are only going to be able to use it with your custom activities, not out of the box activities like While or IfElseBranch. First start by creating your custom ActivityCondition like the following: [ DisplayName
Posted by tomlake | 1 Comments
Attachment(s): CustomActivityConditionExample.exe
Wednesday, August 30, 2006 5:35 PM

Switch activity

The Switch activity I created is based on the switch statement in C# or the Select Case statements in VB . You have an expression and one or more case statements, one of which can be the default. To model within workflow the case becomes a property that
Posted by tomlake | 4 Comments
Attachment(s): SwitchActivity.exe
Monday, July 17, 2006 10:00 AM

Basics of Working with Custom Types in Workflow

If you have used a custom type for an activity / workflow property you have probably ran into a few issues. You might have had problems trying to get it serialized correctly or to be able to set the value in the property browser. With this post I will
Posted by tomlake | 6 Comments
Attachment(s): WorkingWithCustomTypes.EXE
Friday, July 14, 2006 4:45 PM

Do you want to invoke another workflow but you won't know which one until runtime?

The InvokeWorkflowActivity that ships with WF requires you to set the type of the target workflow at design time. If you won’t know which workflow to invoke until runtime you need to write a custom activity. To invoke a workflow need to use the IStartWorkflow
Posted by tomlake | 7 Comments
Attachment(s): CustomInvokeWorkflowActivity.exe
Friday, July 14, 2006 3:14 PM

Do you need to launch another process from your workflow?

When start another process from your workflow you can’t just not return from the Execute method until the process completes. This would block the entire workflow from receiving any other events and would hold onto the thread. Instead you need to use a
Posted by tomlake | 1 Comments
Attachment(s): ProcessActivity.EXE
Monday, June 05, 2006 1:17 PM

How to set activity property from a custom input form

Sometime you might want to create an input form for your user to set properties on your custom activity. Unfortunately when you set the properties directly on the activity from the input form the values don’t always get reflected on your activity. To
Posted by tomlake | 0 Comments
Attachment(s): InputActivity.exe
Friday, June 02, 2006 11:30 AM

How to send data to a workflow

Sometimes you need to send data to a workflow from the host. To do this you need create an interface that is decorated with the ExternalDataExchange attribute and contains an event delegate like the following: [ ExternalDataExchange ] public interface
Posted by tomlake | 4 Comments
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Attachment(s): SendDataToStateMachine.exe
Thursday, May 18, 2006 2:05 PM

Project template for XAML Activation Console Application

If you work with XAML activation from time to time and like being able to debug your workflow using a console application you should install these templates. However, you don’t like having to modify the default console application template each time.
Posted by tomlake | 1 Comments
Attachment(s): XAMLActivationTemplates.exe
Wednesday, May 17, 2006 11:12 AM

Examples of using Persistence and Tracking in ASP.NET

When you are working with ASP.NET you may have the need to persistence and / or tracking. I have put together two examples, one with shared databases and the other with separate, and included the command scripts to create the databases for you. There
Posted by tomlake | 4 Comments
Attachment(s): ASPNETWithPersistenceAndTracking.exe
Monday, May 08, 2006 11:03 AM

Using XAML activation in ASP.NET with a StateMachineWorkflow

If you want to use XAML activation in ASP.NET you will need to be using Windows Workflow Foundation Beta 2.2, that can be found here . The reason for this is that although XAML activation works in most cases with Beta 2 it isn’t officially supported in
Posted by tomlake | 2 Comments
Attachment(s): ASPNETXAMLActivation.EXE
Thursday, May 04, 2006 1:55 PM

Couple of custom activities that you can use to synchronize branches of a ParallelActivity

You could use a SynchronizationScope Activity, but this would block execution all together in the other branches since the thread is locked until the activity is done executing. If that is not the behavior you are looking for here are two options. First,
Posted by tomlake | 1 Comments
Attachment(s): SynchronizationActivities.exe
Tuesday, May 02, 2006 4:41 PM

XAML activation and how to use it

XAML activation is when you use the serialized xoml file to create and run a workflow instance. You will use one of the following WorkflowRuntime methods to create the workflow instance: public WorkflowInstance CreateWorkflow( XmlReader workflowDefinitionReader);
Posted by tomlake | 4 Comments
Attachment(s): XAMLActivation.exe
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