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Generating UCC - 12 in Visual C# Part II

Part II
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Working with Activities
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lock (_syncLock) { // Re-verify the service isn't null // now that we're locked... if (value != null) { _service = value; } // if else { throw new InvalidOperationException( "You must provide a service instance."); } // else } // lock } // if else { throw new InvalidOperationException( "You must provide a service instance."); } // else }
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4. Mirroring the accessor property for the service, we need to add a property to access the data. Add this code following the code you added in the preceding step:
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public DataSet MVData { get { return _dataValue; } }
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5. Because the connector class derives from IMVDataService, we must implement MVDataUpdate:
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public void MVDataUpdate(DataSet mvData) { // Assign the field for later recall _dataValue = mvData; // Raise the event to trigger host read _service.RaiseMVDataUpdateEvent(); }
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The workflow uses this method to store the DataSet in the data value field. It raises the event to let the host know data is available. The full bridge connector class is shown in Listing 8-3. Note that we re not ready to compile the entire application just yet. We still have a bit more code to add.
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Listing 8-3 MVDataconnector.cs completed
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using using using using using using System; System.Collections.Generic; System.Text; System.Workflow.Activities; System.Workflow.Runtime; System.Data;
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8
Calling External Methods and Workflows
namespace MVDataService { public sealed class MVDataConnector : IMVDataService { private DataSet _dataValue = null; private static WorkflowMVDataService _service = null; private static object _syncLock = new object(); public static WorkflowMVDataService MVDataService { get { return _service; } set { if (value != null) { lock (_syncLock) { // Re-verify the service isn't null // now that we're locked... if (value != null) { _service = value; } // if else { throw new InvalidOperationException( "You must provide a service instance."); } // else } // lock } // if else { throw new InvalidOperationException( "You must provide a service instance."); } // else } } public DataSet MVData { get { return _dataValue; } } // Workflow to host communication method public void MVDataUpdate(DataSet mvData) { // Assign the field for later recall _dataValue = mvData; // Raise the event to trigger host read _service.RaiseMVDataUpdateEvent(); } } }
Part II
Working with Activities
Creating the bridge service class 1. With the MVDataService project again open in Visual Studio, locate the WorkflowMVDataService.cs file and open it for editing. 2. As with the MVDataConnector class, we need to add the class definition and fields. So copy the following code into the WorkflowMVDataService.cs file following the opening namespace brace:
public class WorkflowMVDataService { static WorkflowRuntime _workflowRuntime = null; static ExternalDataExchangeService _dataExchangeService = null; static MVDataConnector _dataConnector = null; static object _syncLock = new object(); public event EventHandler<MVDataAvailableArgs> MVDataUpdate; private Guid _instanceID = Guid.Empty; }
3. The _instanceID field needs to be accessible from outside the class, so add the following property:
public Guid InstanceID { get { return _instanceID; } set { _instanceID = value; } }
4. We now add a static factory method we ll use to create instances of this class. We do this so that all the important housekeeping is accomplished as we create instances of this bridge service. For example, we need to make sure the ExternalDataService service is plugged into the workflow runtime. We ll also add the bridge connector class we just created as a pluggable service so that the workflow has access to the data connection class. Therefore, add this method following the property we added in step 3:
public static WorkflowMVDataService CreateDataService(Guid instanceID, WorkflowRuntime workflowRuntime) { lock (_syncLock) { // If we're just starting, save a copy of the workflow // runtime reference. if (_workflowRuntime == null) { // Save instance of the workflow runtime. _workflowRuntime = workflowRuntime; } // if
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