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C HAPTE R 10 DA TA BINDIN G
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and AndNew. As you can see, you can provide plenty of functionality for your form with virtually no code. Table 10-5 lists the other extended properties.
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Table 10-5. Extended Properties of CslaActionExtender
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Property
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Description
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Uniquely identifies the control so that when an event is raised from the CslaActionExtender component, the subscriber can determine which control caused the event to fire Allows the monitoring of the underlying object graph s dirty state and provides automatic enabling and disabling of the button depending on the state Rebinds your object after a Save action has finished; this is set to False in the case of a Close button or a Save-AndNew button
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DisableWhenClean
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RebindAfterSave
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Note When using the DisableWhenClean property, pay close attention to the Data Source Update mode for each individual entry control (TextBox, CheckBox, and so on). The default setting of OnValidation in combination with a True setting on the property causes the button to remain disabled until you tab out of the changed text field, which may not be a desired behavior. Alternatively, changing the mode to OnPropertyChanged produces a nice instant enabling effect on the button, but it also updates your BindingSource on every key press, thus setting your object s property on every key press and possibly running validation rules on every key press. This also may not be a desired behavior, depending on the weight of your business rules.
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The CslaActionExtender control can keep track of almost everything having to do with your business object(s) except for how to create a new one. You determine how to create a new object when you write a factory method that makes a call to DataPortal.Create. For this reason, if you configure one of your buttons with a Save value on the ActionType property and an AddNew value on the PostSaveAction property, you must trap the SetForNew event of the extender component. It is here where you need to reset your business object variable to a new instance and call your rebind method. This rebind method sets the BindingSource component s DataSource property, calls the ResetControlAuthorization() method on any ReadWriteAuthorization components you may be using, and calls ResetActionBehaviors on any CslaActionExtender components. Table 10-6 lists other events of CslaActionExtender.
Table 10-6. Events Raised by CslaActionExtender
Event
BusinessObjectInvalid
Description
Raised when an attempt is made to save an invalid object. Remember that the validity check on the root object reads into all underlying child objects in the object graph. Also remember that information and warning rules do not invalidate an object. Raised immediately upon clicking the button, before any action takes place. The event allows the cancellation of any functionality that may follow. Raised at the very end of the determined action for the button.
Clicking
Clicked
CHAPTER 10 DATA B INDING
Table 10-6. Events Raised by CslaActionExtender (Continued)
Event
ErrorEncountered HasBrokenRules ObjectSaving
Description
Raised when an exception is encountered while CslaActionExtender is executing some behavior. Raised when an attempt is made to save the object, and the object has one or more broken validation rules of any rule severity. Raised after a successful validity check but before the object gets saved, allowing you to test for nonfatal rules and also for any broken rules down the object graph. Raised immediately after a successful save operation.
ObjectSaved
Working with Multiple Root Objects
If your form requirements are to manage two (or more) distinct root business objects at the same time, you will require two (or more) CslaActionExtender components, each bound to a different root BindingSource component. It s important to note that this will cause every button or link on your form to display more than one of each of the extender properties. However, they will display along with the name of each CslaActionExtender component. ActionType on cslaActionExtender1 ActionType on cslaActionExtender2 You can then assign specific buttons to interact with one CslaActionExtender component or the other, or even both.
Note CSLA .NET does not propagate broken rules in child objects or child collections up to the root object, so the interaction with broken rules from the CslaActionExtender applies only to the root object and only when that root object is of type BusinessBase. However, the validity check aggregates the entire underlying object graph when you use managed backing fields for your child objects or properly overrides the business object s IsValid and IsDirty properties.
The CslaActionExtender component will work with a BindingSource hierarchy where the root business object is a type of either BusinessBase or BusinessListBase, so it can indeed save you a lot of code and provide for an even cleaner UI. The following is a sample of a form s code that uses the CslaActionExtender component to act upon an order object and its children: Public Partial Class OrderMaint Inherits Form Public Sub New() InitializeComponent() End Sub Public Sub New(ByVal orderId As Guid) InitializeComponent() _order = Order.GetOrderWithDetail(orderId) BindUI() End Sub
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