8: SharePoint Workflow in Visual Studio .NET

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8: SharePoint Workflow
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3 Locate the CorrelationToken property and set the value to taskToken You have to use a unique correlation token for each task you are referencing in a workflow You must use the same correlation token if you want multiple activities to reference the same task (such as in a CreateTask activity at the beginning of a workflow and then later in a CompleteTask or other task-related activity that is referring to the task that was created in the workflow)
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Correlation token is a unique string identifier within your workflow that enables mapping between the items in your workflow, hosting environment, and workflow runtime The most common errors SharePoint workflow developers experience are due to incorrectly set correlation tokens The guidance is to have a separate correlation token for the workflow itself and each task you need to reference in the workflow If you are creating a new task and are then changing an existing one you would need two separate correlation tokens to represent those two tasks However, if you want to reference the same task you created in the OnTaskChanged or CompleteTask activity for example you would use the same correlation token throughout the workflow
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4 Expand the CorrelationToken property and set OwnerActivityName to Workflow1 5 Find and click on the TaskId property in the Properties window This will display the ellipsis ( ) button; click it to display the Bind dialog as shown in Figure 8-9 The Bind dialog is used to link a workflow property to a field or property in the code-behind file This can be either an existing member or you can choose to create a new one 6 Click Bind to a new member tab 7 Type taskId in the New member name textbox 8 Select Create Property radio button
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Figure 8-9: Binding dialog
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9 Click OK 10 Repeat steps 5 9 for the TaskProperties property and use taskProperties for the New member name Binding activity properties is usually the first thing you need to do after you add an activity to the designer Above, you created new member variables for the TaskId and TaskProperties properties in order to be able to access them from code We still need to set the taskId and taskProperties in order for the activity to create a new task once workflow is started The best place to do this is before the activity is executed Follow these steps to add the event handler 1 Double click on the createTask1 activity to open the code view A method is created in the Workflow1cs code file called createTask1_MethodInvoking 2 In this method, initialize taskId and taskProperties
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8: SharePoint Workflow
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In order to be able to reference the new task and to set its properties we need to initialize both taskId and taskProperties The taskId property is merely a GUID that represents the new task, and taskProperties is an instance of the SPWorkflowTaskProperties object that contains properties that pertain to SharePoint tasks, such as title, description, due date, etc An implementation for the createTask1_MethodInvoking method is shown in Listing 8-1
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Listing 8-1: MethodInvoking for createTask1
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The above code creates a new GUID and assigns it to the taskId property we created using the Bind dialog For taskProperties we create a new instance of the SPWorkflowTaskProperties class and set a few properties In the above example we used two of the most common properties: AssignedTo and Title The SPWorkflowTaskProperties class contains more properties that you can use, such as StartDate, PercentComplete, and DueDate Make sure to assign your own user account to the AssignedTo property, otherwise the workflow will not complete successfully Now let s add a breakpoint to the CreateTask activity and deploy the project To add a breakpoint, switch to the Workflow designer, select the desired activity, and press F9 Press F5 to package and deploy the workflow and start debugging it When deployment completes, an web browser opens up to the Shared Documents library with which you associated the workflow In the wizard we chose to automatically associate workflow, so you can just upload a new document to the Shared Documents list to start the workflow To upload a new document to the Shared Document list, click the Add document link at the bottom of the list, browse to the file you want to upload, and click OK to upload it As soon as the document is uploaded to the list, the workflow is started, and the breakpoint on the CreateTask activity is hit Press F5 to continue running the workflow
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