create 2d barcode c# Calling External Methods and Workflows in C#

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Calling External Methods and Workflows
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// If we're just starting, plug in ExternalDataExchange service. if (_dataExchangeService == null) { // Data exchange service not registered, so create an // instance and register. _dataExchangeService = new ExternalDataExchangeService(); _workflowRuntime.AddService(_dataExchangeService); } // if // Check to see if we have already added this data // exchange service. MVDataConnector dataConnector = (MVDataConnector)workflowRuntime. GetService(typeof(MVDataConnector)); if (dataConnector == null) { // First time through, so create the connector and // register as a service with the workflow runtime. _dataConnector = new MVDataConnector(); _dataExchangeService.AddService(_dataConnector); } // if else { // Use the retrieved data connector. _dataConnector = dataConnector; } // else // Pull the service instance we registered with the // connection object. WorkflowMVDataService workflowDataService = MVDataConnector.MVDataService; if (workflowDataService == null) { // First time through, so create the data service and // hand it to the connector. workflowDataService = new WorkflowMVDataService(instanceID); MVDataConnector.MVDataService = workflowDataService; } // if else { // The data service is static and already registered with // the workflow runtime. The instance ID present when it // was registered is invalid for this iteration and must be // updated. workflowDataService.InstanceID = instanceID; } // else return workflowDataService; } // lock }
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5. The connection object we created in the preceding section ( Creating the bridge connector class ) keeps an instance of the bridge object we created in step 4. We now will add a static helper method to return the bridge service instance. Although this might seem more than is necessary now, later when we address correlation it ll become apparent why we did things this way:
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public static WorkflowMVDataService GetRegisteredWorkflowDataService(Guid instanceID) { lock (_syncLock) { WorkflowMVDataService workflowDataService = MVDataConnector.MVDataService; if (workflowDataService == null) { throw new Exception("Error configuring data service..." + "service cannot be null."); } // if return workflowDataService; } // lock }
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6. Next we add our (private) constructor and destructor. As with the bridge connection class, we need to make sure we break the circular references we re building between the bridge connection object and the bridge service object. Here are the lines of code you need:
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private WorkflowMVDataService(Guid instanceID) { _instanceID = instanceID; MVDataConnector.MVDataService = this; } ~WorkflowMVDataService() { // Clean up _workflowRuntime = null; _dataExchangeService = null; _dataConnector = null; }
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7. Although we ve added some important things to the bridge service class, not the least of which is the introduction of the ExternalDataService to the workflow runtime, we still have to add code that represents a major functional aspect the ability to read and return the data to the host application. The bridge connection object actually maintains the connection state (the data), but the host uses this service to gain access to that data. Here is the read method we add:
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public DataSet Read() { return _dataConnector.MVData; }
8
Calling External Methods and Workflows
8. The final functional block we ll add to our bridge service is a method to raise the motor vehicle data update event. The workflow uses this method to fire a notification to the host that data is available for pickup:
public void RaiseMVDataUpdateEvent() { if (_workflowRuntime == null) _workflowRuntime = new WorkflowRuntime(); // Load persisted workflow instances. _workflowRuntime.GetWorkflow(_instanceID); if (MVDataUpdate != null) { MVDataUpdate(this, new MVDataAvailableArgs(_instanceID)); } // if }
The full bridge service is shown in Listing 8-4.
Listing 8-4 WorkflowMVDataService.cs completed
using using using using using using System; System.Collections.Generic; System.Text; System.Workflow.Activities; System.Workflow.Runtime; System.Data;
namespace MVDataService { 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; public Guid InstanceID { get { return _instanceID; } set { _instanceID = value; } } 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)
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