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Private Sub BindUI() _bindingTree = BindingSourceHelper.InitializeBindingSourceTree( _ Me.components, orderBindingSource) _bindingTree.Bind(_order) End Sub Private Sub toolSave_Click(ByVal sender As Object, ByVal e As EventArgs) If Save() Then MessageBox.Show("Order saved.") End If End Sub Private Sub toolSaveNew_Click(ByVal sender As Object, ByVal e As EventArgs) If Save() Then _order = Order.NewOrder() BindUI() End If End Sub Private Sub toolSaveClose_Click(ByVal sender As Object, ByVal e As EventArgs) If Save() Then Me.Close() End If End Sub Private Sub toolCancel_Click(ByVal sender As Object, ByVal e As EventArgs) _bindingTree.Cancel(_order) End Sub Private Sub toolClose_Click(ByVal sender As Object, ByVal e As EventArgs) _bindingTree.Close() End Sub Private Function Save() As Boolean Dim ret As Boolean = False _bindingTree.Apply() Try _order = _order.Save() ret = True Catch ex As Exception MessageBox.Show(ex.Message) End Try BindUI() Return ret End Function End Class You can use the BindingSourceNode and BindingSourceHelper classes to save you a lot of code and complexity, but you re still responsible for code involving validation checking, broken rules reporting, exception handling, and, of course, the actual functionality to save or undo the object. You ll need to do this when you re using toolbars to allow users to interact with your forms, but if you re going to be using buttons or links, there is a better way.
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CHAPTER 10 DATA B INDING
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Using the CslaActionExtender Control
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As stated earlier, the CslaActionExtender component is an extender provider that adds functionality to any control that implements the IButtonControl interface. This means that you can use it with any Visual Studio button or link as well as with any third-party button control or link. The CslaActionExtender makes use of both the BindingSourceNode and the BindingSourceHelper classes and provides an almost no-code approach to functionality for which you would normally have to write quite a bit of code. This functionality includes saving a business object, invoking undo functionality of a business object, and closing a form. Moreover, the saving functionality comes in three flavors, which I ll get to in a minute. The CslaActionExtender component drags onto your form s component tray just like the ReadWriteAuthorization and BindingSourceRefresh components and just like a BindingSource component, for that matter. You can hit the ground running on this control in just one step. Simply call the ResetActionBehaviors method of the component and pass your root business object into its one and only argument. This initializes the component and everything within it, just like the ResetControlAuthorization() method in the ReadWriteAuthorization component. You ll then need some buttons on your form to represent certain actions. The mere presence of the CslaActionExtender component adds several properties to your buttons, all nicely organized in the Csla property browser category. The CslaActionExtender component can extend button or buttonlike controls to provide save, cancel, or close functionality automatically. The CslaActionExtender component also includes properties and events of its own, the most important being the DataSource property, which you would point to a root BindingSource on the form. Table 10-4 lists other properties.
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Table 10-4. Properties of CslaActionExtender
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Property
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AutoShowBrokenRules WarnIfCloseOnDirty DirtyWarningMessage WarnOnCancel WarnOnCancelMessage
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Allows the control to automatically display any broken rules found on the root object using a standard Windows Forms message box. Allows the control to optionally warn you if you click a Close button while the bound business object is dirty. Used with WarnIfCloseOnDirty, this is the message that will display. Allows the control to warn you when you attempt to use a Cancel button for an undo operation when the bound business object is dirty. Used with WarnOnCancel, this is the message that will display.
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You can intercept all this functionality using the CslaActionExtender s event model, which I ll describe later in this chapter. Besides all these properties, which apply to the component as a whole, there are button-specific properties as well. The most important one is called ActionType and appears with the others in the Csla property browser category as ActionType on cslaActionExtender1. cslaActionExtender1 is the name of the CslaActionExtender component you dropped onto the form. The default value for this property is None, which means this button provides no extended functionality at all. It also means that this button will not trigger any communication with the associated CslaActionExtender component. The other three values for this property are Save, Cancel, and Close. Setting this property to any one of these values assigns that functionality to the control. When you set the property to Save, you have an additional option for a post-save action, configured by the PostSaveAction extended property. The possible values for this property are None, AndClose,
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