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Quite often, the integrated help is not enough for our needs, particularly if we interact with an external system that is documented elsewhere. .NET objects are not documented in PowerShell; their reference material is available on the Microsoft Developer Network (MSDN) web site for example. Fortunately, PowerShell makes it quite easy to create several global functions that we can use to open a web browser window and get help about an object.

Value C:\Pro AppFabric Book\Contoso\Solution\Contoso.Services\ AppraisalService.WCF\Package\AppraisalService.WCF.zip

private delegate void UpdateDelegate(); void carService_MessageReceived( object sender, MessageReceivedEventArgs e) { //save the workflow instance Id _instanceId = e.InstanceId; UpdateDelegate theDelegate = delegate() { //update the message shown in the UI lblMessage.Text = e.Message; }; //execute the anonymous delegate on the UI thread this.Invoke(theDelegate); } In the carService_MessageReceived handler method, the code is careful to update the user interface on the UI thread. #endregion #region UI event handlers private void btnNewCar_Click(object sender, EventArgs e) { _instanceWrapper = _workflowManager.StartWorkflow( typeof(CarWorkflow), null); _instanceId = _instanceWrapper.WorkflowInstance.InstanceId; //enable the buttons EnableEventButtons(true); btnNewCar.Enabled = false; } The btnNewCar_Click method is the Click event handler for the New Car button. This method contains the code to start a new workflow. The Click event handlers for the other Button controls simply raise one of the events using a method in the local CarService. private void btnStartEngine_Click(object sender, EventArgs e) { try { _carService.OnStartEngine(GetEventArgs()); } catch (Exception exception) { HandleException(exception); } }

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Note The Microsoft Developer Network, or MSDN for short, is the Microsoft division responsible for managing

private void btnStopEngine_Click(object sender, EventArgs e) { try { _carService.OnStopEngine(GetEventArgs()); } catch (Exception exception) { HandleException(exception); } } private void btnLeaveCar_Click(object sender, EventArgs e) { try { _carService.OnLeaveCar(GetEventArgs()); //disable the buttons EnableEventButtons(false); btnNewCar.Enabled = true; } catch (Exception exception) { HandleException(exception); } } private void btnForward_Click(object sender, EventArgs e) { try { _carService.OnGoForward(GetEventArgs()); } catch (Exception exception) { HandleException(exception); } } private void btnStop_Click(object sender, EventArgs e) { try { _carService.OnStopMovement(GetEventArgs()); } catch (Exception exception) { HandleException(exception); } }

private void btnReverse_Click(object sender, EventArgs e) { try { _carService.OnGoReverse(GetEventArgs()); } catch (Exception exception) { HandleException(exception); } } private void btnBeepHorn_Click(object sender, EventArgs e) { try { _carService.OnBeepHorn(GetEventArgs()); } catch (Exception exception) { HandleException(exception); } } private ExternalDataEventArgs GetEventArgs() { ExternalDataEventArgs args = new ExternalDataEventArgs(_instanceId); args.WaitForIdle = true; return args; } When raising external events that are handled by a state machine workflow, it is important to raise events only after the workflow has transitioned to a new state. If you were to raise an event while the workflow is in the middle of transitioning to its new state, the workflow would not be able to handle the event and an EventDeliveryFailedException would be thrown. To prevent this from occurring, you can set the optional WaitForIdle property of the ExternalDataEventArgs class to true. This causes the workflow runtime to wait until the workflow has completed the state transition and is idled before attempting to deliver the event. This property is set in the private GetEventArgs method. private void HandleException(Exception e) { if (e is EventDeliveryFailedException) { MessageBox.Show("Action not allowed", "Not Allowed", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { MessageBox.Show(e.Message, "Unhandled Exception", MessageBoxButtons.OK, MessageBoxIcon.Error); } } #endregion

12. Click Next two more times, then click Finish. You will now see a new Web application called AppraisalService.WCF listed under the Contoso.Claims.Services Web site, as shown in Figure 8-8. At this point, you can browse to the AppraisalService.svc in your Internet Explorer browser without any additional WCF configuration or activation logic (see Figure 8-9).

the company s relationships with software developers. It offers services for distributing software tools, provides a home for many blogs and several online communities, and hosts huge documentation resources related to developer tools and products. Many objects we are manipulating with PowerShell are really .NET objects, and those are documented on the MSDN site. The site start page can be found at http://msdn.microsoft.com.

#region Internal Helper methods private void EnableEventButtons(Boolean enabled) { btnStartEngine.Enabled = enabled; btnStopEngine.Enabled = enabled; btnForward.Enabled = enabled; btnReverse.Enabled = enabled; btnStop.Enabled = enabled; btnBeepHorn.Enabled = enabled; btnLeaveCar.Enabled = enabled; } #endregion } }

There are many ways to open a web site from within PowerShell. The most common one is to launch a browser instance and pass the URL as a command-line parameter. Another

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