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Before an event can be defined, you must either choose an existing event handler delegate or define a new one. The choice of an event handler delegate depends on the information that should be passed with the callback. If no special information is passed, the delegate System::EventHandler can be used: public delegate void EventHandler(Object^ sender, EventArgs^ ea); The type EventArgs does not have instance-specific properties or fields. Therefore, no information is passed with an EventArgs object. Its only purpose is to ensure that the EventHandler delegate follows the common pattern for event handler delegates. If you want to support a cancellation option, you can use the System::ComponentModel::CancelEventHandler instead: public delegate void CancelEventHandler(Object^ sender, CancelEventArgs^ ea); It is a common pattern to define a new type XXXEventArgs that is derived from System::EventArgs for a delegate named XXXEventHandler. The type CancelEventArgs follows this pattern because it is used in the signature of the CancelEventHandler delegate. The CancelEventArgs class has the Boolean property Cancel, which can be set to true in an event handler implementation to indicate that an operation should be canceled. For the PageDumped event, there should be a cancellation option, and the current page number should be passed. Therefore, a custom event handler delegate can be defined as follows: public ref class PageDumpedEventArgs : public CancelEventArgs // property Cancel inherited { int pagesDumped; internal: PageDumpedEventArgs(int _pagesDumped) : pagesDumped(_pagesDumped) {} public: property int PagesDumped { int get() { return pagesDumped; }

The second overload is called by the PropertyHasChanged() method: Protected Overridable Sub PropertyHasChanged(ByVal propertyName As String) MarkDirty(True) Dim propertyNames = ValidationRules.CheckRules(propertyName) If ApplicationContext.PropertyChangedMode = _ ApplicationContext.PropertyChangedModes.Windows Then OnPropertyChanged(propertyName) Else For Each name In propertyNames OnPropertyChanged(name) Next End If End Sub The PropertyHasChanged() method is called by the SetProperty() methods discussed in 7 to indicate that a specific property has changed. Notice that in this case, any validation rules for the property are checked (the details on this are discussed in 11).

This method is Overridable, allowing you to add extra steps to the process if needed. Additionally, this means you can override the behavior to implement field-level dirty tracking if desired.

} }; public delegate void PageDumpedEventHandler(Object^ sender, PageDumpedEventArgs^ ea); The delegate PageDumpedEventHandler has two characteristic arguments: an Object^ for the sender and an event-specific argument of type PageDumpedEventArgs^ The type PageDumpedEventArgs contains all information passed between the code that fires the event and the code that handles the event The class PageDumpedEventArgs inherits the read/write property Cancel from its base class, CancelEventArgs PageDumpedEventArgs itself defines the read-only property PagesDumped The event s target function can use the PageDumpedEventArgs argument to read the PagesDumped property and to modify the Cancel property The code that fired the event can see this modification In general, information passed by value to the event handler should end up in a read-only property, whereas information passed by reference should be a read/write property of the EventArgs-derived type.

Then the object is marked as being dirty by raising the PropertyChanged event for the specific property that is changed. This isn t as simple as I would like because the code needs to behave differently when used by WPF as opposed to any other UI technology such as Windows Forms or Web Forms. Since there s no way to automatically detect whether this object is being used by WPF, there s a configuration switch the business developer can set to indicate how this method should behave.

The Csla.ApplicationContext.PropertyChangedMode setting can be configured through the application s config file or in code. In code, the UI developer will typically set the value by running the following line of code exactly once as the application starts up: Csla.ApplicationContext.PropertyChangedMode = Csla.ApplicationContext.PropertyChangedModes.Xaml This needs to be done only in a WPF application, because the default is Windows, which is the correct setting for any non-WPF application. The value can also be set in the application s app.config file by adding the following element to the <appSettings> element: <add key="CslaPropertyChangedMode" value="Xaml" /> Either way, the result is that the PropertyChanged events are raised as required by WPF rather than as needed for Windows Forms or Web Forms.

When delegates are used for event handling, it is the client s job to instantiate a delegate and pass it to the component The component can store a handle to the delegate object in a member variable and use it for the callback when the event needs to be fired So far, we have not discussed how a client can pass a delegate The CTS introduces a new kind of type member especially for the passing of event handler delegates This type member is called event The following code defines a PageDumped event in the FileDumper component: public ref class FileDumper : public Component { int pagesDumped; void DumpPage(StreamReader^ sr, String^% line) { /* .. same as before ...

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