WF, WCF, and AppFabric notes
Tracking an Expression activity in Windows Workflow Foundation
Since the nodes in a Flowchart do not derive from Activity, they do not have the tracking...
Date: 08/09/2011
Making an activity's display name readonly in the Workflow 4 designer
To make an activity's display name readonly, it isn't enough to use the ReadOnlyAttribute on the...
Date: 05/16/2011
Constraining what activities can be dropped on a custom activity designer in Workflow 4
When designing a custom activity that can be used as a container for other activities, you may want...
Date: 05/09/2011
Programmatically calling validation in a rehosted Workflow 4 designer
The workflow designer has a rich programming model that supports communication with the host. A...
Date: 04/27/2011
WF 4 hosting options: IIS, AppFabric, and Windows Service
Most of the Windows Workflow Foundation samples use workflows that are hosted in a console...
Date: 04/18/2011
HttpContext.Current returning null when using NetTcpBinding in WCF4
When using NetTcpBinding, not all of the features of WCF are available, particularly those using...
Date: 04/06/2011
Error message in WF4: "Error: The values provided for the root activity's arguments did not satisfy the root activity's requirements"
When loading an activity assembly using Assembly.LoadFrom, you may see the following error: "Error:...
Date: 04/06/2011
Workflow Designer: What properties appear in the Properties pane when activities are multi-selected?
When multiple activities are selected in the Workflow Designer surface with ctrl+click, it's not...
Date: 03/17/2011
Validation error message: "An error occurred while attempting to extract the target object of type 'System.Activites.InArgument' from the method call expression .Get"
When using the (non-Generic) version of InArgument, you may see the following error message during...
Date: 03/16/2011
Cancelling an AsyncCodeActivity
Even when AsyncCodeActivity.Cancel is called, the activity will still execute the EndExecute method,...
Date: 03/16/2011
WF 4 SqlWorkflowInstanceStore: Supported SQL Server versions
The SqlWorkflowInstanceStore is an out-of-box instance store implementation in Workflow 4 that uses...
Date: 03/11/2011
Using a SymbolResolver to access host environment information
To access environment information from within an activity, you'll need to use the...
Date: 03/10/2011
WF 3.5 Persistence and Tracking: Two databases or one?
This refers to the previous version of Workflow, but it came up in a recent discussion, so I thought...
Date: 03/03/2011
Error message: "The argument of type '' cannot be used. Make sure that it is declared on an activity."
The following error might occur when an activity executes: The argument of type '<type>'...
Date: 02/23/2011
Piping the result of Activity to another activity as an input argument
Expression activities (that is, activities that return a value, inheriting from Activity<T>,...
Date: 02/17/2011
Rules and rulesets in Workflow 4
It's always difficult to find the lack of something in a search engine. Rulesets, a feature of...
Date: 02/15/2011