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How to change the status of a sharepoint workflow task?

I am new to sharepoint programming. I have the following code:

SPWorkflowTask task = some_getter(); task["Status"] = "Canceled"; task.Update();

and I get a SPException:

 Microsoft.SharePoint.SPException: "This task is currently locked by a running workflow and cannot be edited." at Microsoft.SharePoint.SPListItem.PrepareItemForUpdate(Guid newGuidOnAdd, Boolean bMigration, Boolean& bAdd, Boolean& bPublish, Object& objAttachmentNames, Object& objAttachmentContents, Int32& parentFolderId) at Microsoft.SharePoint.SPListItem.UpdateInternal(Boolean bSystem, Boolean bPreserveItemVersion, Guid newGuidOnAdd, Boolean bMigration, Boolean bPublish, Boolean bNoVersion, Boolean bCheckOut, Boolean bCheckin, Boolean suppressAfterEvents) at Microsoft.SharePoint.SPListItem.Update() at mycode

I believe that I am doing something fundamentally wrong. Can anybody help me?

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5 answers

here is an expert comment on this issue: http://geek.hubkey.com/2007/09/locked-workflow.html

And if you edited the columns in the task list, this link may help: http://social.msdn.microsoft.com/Forums/en-US/sharepointworkflow/thread/8ec834b6-5408-4079-bdfb-b88d341b36bf/

hope this helps

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In fact, you can change the advanced properties of a task using the SPWorkflowTask.AlterTask method (task SPListItem, Hashtable htData method, bool fSynchronus). Hashtable contains advanced properties.

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In your SPWeb object, set AllowUnsafeUpdates = true. The error will disappear. Remember to set AllowUnsafeUpdates to false when you are done.

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You need to set the task property SPBuiltInFieldId.WorkflowVersion to 1 I wrote it here: http://blogs.technet.com/b/meamcs/archive/2011/03/26/workflow-error-this-task-is-currently- locked-by-a-running-workflow-and-cannot-be-edited.aspx

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You cannot adjust the Workflow task from outside the workflow. You must somehow inform the workflow in order to change the task. I am not 100% sure what the best approach would be, and I am really interested in answers to this :)

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