vb.net qr code open source Configuring the Persistence Provider Factory in VB.NET

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Configuring the Persistence Provider Factory
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In the AddLead.xaml.cs file, add the following class member. This is a reference to the InstanceStore class that will be used to persist and load the workflow instances: private InstanceStore _instanceStore; Then add the following code to the Loaded event handler; it configures the store: _instanceStore = new SqlWorkflowInstanceStore(_connectionString); InstanceView view = _instanceStore.Execute (_instanceStore.CreateInstanceHandle(),
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new CreateWorkflowOwnerCommand(), TimeSpan.FromSeconds(30)); _instanceStore.DefaultInstanceOwner = view.InstanceOwner; InstanceStore is an abstract class from which all persistence providers are derived. In this project, you will use the SqlWorkflowInstanceStore class, which uses a SQL Server database. An instance of the concrete class (SqlWorkflowInstanceStore) is created, passing the connection string in the constructor. The parameters to the Execute() method are a handle (provided by InstanceStore), a command, and a timeout value. It returns an InstanceView class, which is roughly analogous to a connection handle.
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Creating Leads
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To create a new lead, the user will fill in the fields on the form and then click the Add Lead button. Add a method to implement the event handler when the Add Lead button is clicked using the code shown in Listing 11-7. Listing 11-7. Implementation of the btnAddLead_Click Event Handler private void btnAddLead_Click(object sender, RoutedEventArgs e) { // Setup a dictionary object for passing parameters Dictionary<string, object> parameters = new Dictionary<string, object>(); parameters.Add("ContactName", txtName.Text); parameters.Add("ContactPhone", txtPhone.Text); parameters.Add("Interests", txtInterest.Text); parameters.Add("Notes", txtNotes.Text); parameters.Add("ConnectionString", _connectionString); parameters.Add("Rating", int.Parse(txtRating.Text)); parameters.Add("Writer", new ListBoxTextWriter(lstEvents)); WorkflowApplication i = new WorkflowApplication (new EnterLead(), parameters); // Setup persistence i.InstanceStore = _instanceStore; i.PersistableIdle = (waiea) => PersistableIdleAction.Unload; i.Run(); } This code creates a Dictionary object and stores data in it for all the input arguments. It then creates a WorkflowInstance. The constructor takes two parameters: workflow definition an instance of the EnterLead class Dictionary object containing the input arguments
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The code then configures the workflow instance to be persisted. First, it sets the InstanceStore property using the reference created in the Loaded event handler. It then provides an event handler for
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the PersistableIdle event, which tells the instance to unload itself from memory. It is persisted to the database prior to being unloaded.
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Tip The syntax for the PersistableIdle event handler might seem strange. In the next chapter, you will implement other event handlers, and I will explain this syntax. For now, just take it on faith that this is handling the PersistableIdle event.
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Finally, the btnAddLead_Click() method calls the instance s Run() method, which starts the workflow asynchronously. The workflow uses the InvokeMethod activity to tell the application about the lead that has just been created. It does this by calling the NewLead() method in the static ApplicationInterface class. Now you will implement this. Open the ApplicationInterface.cs file and add the following method: public static void NewLead(Lead l) { if (_app != null) _app.AddNewLead(l); } This calls the AddNewLead() method in the application. Open the AddLead.xaml.cs file and add the AddNewLead() method as follows: public void AddNewLead(Lead l) { this.lstLeads.Dispatcher.BeginInvoke (new Action(() => this.lstLeads.Items.Add(l))); } The code simply adds this Lead to the lstLeads ListView control. It uses the Dispatcher object to invoke this method using the window s thread.
Assigning Leads
The ListView control displays all the leads that have been entered. The user can click any one of these leads, and more information is displayed about that lead. Specifically, the notes are displayed along with the agent that it has been assigned to. If not yet assigned, a text box and button are displayed to allow the user to assign the lead to an agent. To allow this dynamic display, add the method shown in Listing 11-8. It implements the SelectionChanged event handler. Listing 11-8. Implementation of the SelectionChanged event private void lstLeads_SelectionChanged(object sender, RoutedEventArgs e) {
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