workflow-foundation

I am trying to use custom c# expression inside of NativeActivity It works fine with simple expression like Condition = new CSharpValue("1 == 1") It doesn't work with such expressions Condition = new CSharpValue("Address == null") I cannot refer to the activity's Variable or InArgument in the expression due to expression compilation error "The name 'xxxxx' does not exist in the current context" Working code var act = new ExecuteIfTrue { Condition = new CSharpValue<Boolean>("1 == 1"), Address = new InArgument<MailAddress>(ctx => new MailAddress { DisplayName = "TestDisplayName" }), Body = new

I need to invoke a long running task from an ASP.NET page, and allow the user to view the tasks progress as it executes. In my current case I want to import data from a series of data files into a database, but this involves a fair amount of processing. I would like the user to see how far through the files the task is, and any problems encountered along the way. Due to limited processing resources I would like to queue the requests for this service. I have recently looked at Windows Workflow and wondered if it might offer a solution? I am thinking of a solution that might look like: ASP.NET

The error I am getting is "The WorkflowApplication has been aborted because a Load or LoadRunnableInstance operation threw an exception. Create a new WorkflowApplication object to try loading another workflow instance." I am using "workflowapplication" to run the workflow. The workflow instance I'm trying to load (there are a few of them) were created sometime ago and were persisted into the database. Is there a way to find the exception that was actually thrown during Load or LoadRunnableInstance operation? I caught this error in the "aborted" event on the workflowapplication object, but it

I have read about windows workflow foundation where people use this to model a business process, why not to use UML? According to some answers, the workflow can be my domain? What other tools are equivalent to the WF? Workflow foundation is an executable workflow - the framework includes an engine that executes the workflow. It allows you to write parts of your workflow logic in code. I suggest reading this developers introduction on MSDN. UML doesn't do either thing - you can't use code as part of your UML or execute your UML workflows. UML is intended as a documentation and communication

Suppose if there are two versions of the workflow, some instances are running on version1 and some on version2 , Is there any way so that we can call version1 workflow instead of version2 for a new instance, as we create a instance of workflow it will by default create the instance of version2. .net Framework 4.5 introduces Workflow Versioning which seems to be exactly what you need. These two links should be enough to get started: Using WorkflowIdentity and Versioning How to: Host Multiple Versions of a Workflow Side-by-Side 来源： https://stackoverflow.com/questions/15703857/windows-workflow-4

I need to stop the execution Is there any procedures for using terminate and suspend activity gbanfill It depends exactly what you want to do. There is a Terminate Activity will terminate the workflow instance that is running and has reached that activity. Once terminated, that workflow instance will be dead and will never be restartable. Suspend is something you can call on a WorkflowInstance e.g. WorkflowInstance instance = runtime.GetWorkflow(instanceId); instance.Suspend("Paused for some good reason"); // do something here instance.Resume(); This sample at the microsoft website should help