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At this point, the extender control s basic plumbing is complete. It gets to choose which controls to extend, and maintains a list of all the controls it does extend, along with the ApplyAuthorization property value for each of those controls. When the UI developer wants to enforce authorization rules for the whole form, she can do so by triggering the ReadWriteAuthorization control. To allow this, the control implements a ResetControlAuthorization() method. This method is public, so it can be called by code in the form itself. Typically, this method will be called immediately after a business object has been loaded and bound to the form, or immediately after the user has logged into or out of the application. It is also a good idea to call it after adding a new business object to the database, since some objects will

Go back to the Silverlight player that you created earlier and modify the XAML to the following:

The data source control itself; the UI developer uses this directly Provides the actual implementation of data binding for CslaDataSource Provides a configuration UI form displayed in Visual Studio to configure the control The Visual Studio designer for CslaDataSource Provides schema information and sample data for the designer The schema object for a business object, responsible for returning an instance of ObjectViewSchema Provides actual information about a business object specifically, information about all the business object s bindable properties Maintains information about a specific field in the object schema

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change their authorization rules to be different for an old object than for a new object. You ll see how this works in 9 in the Windows Forms UI for the sample application. The ResetControlAuthorization() method loops through all the items in the list of extended controls. This is the Dictionary object maintained by Get/SetApplyAuthorization as discussed earlier. The ApplyAuthorization value for each control is checked, and if it is true, then authorization rules are applied to that control: public void ResetControlAuthorization() { foreach (KeyValuePair<Control, bool> item in _sources) { if (item.Value) { // apply authorization rules ApplyAuthorizationRules(item.Key); } } } To apply the authorization rules, the code loops through the target control s list of data bindings. Each Binding object represents a connection between a property on the control and a data source, so it is possible to get a reference to the data source through the DataSource property: private void ApplyAuthorizationRules(Control control) { foreach (Binding binding in control.DataBindings) { // get the BindingSource if appropriate if (binding.DataSource is BindingSource) { BindingSource bs = (BindingSource)binding.DataSource; // get the object property name string propertyName = binding.BindingMemberInfo.BindingField; // get the BusinessObject if appropriate if (bs.DataSource is Csla.Core.BusinessBase) { Csla.Core.BusinessBase ds = (Csla.Core.BusinessBase)bs.DataSource; ApplyReadRules( control, binding, propertyName, ds.CanReadProperty(propertyName)); ApplyWriteRules( control, binding, propertyName, ds.CanWriteProperty(propertyName)); } else if (bs.DataSource is Csla.Core.IReadOnlyObject) { Csla.Core.IReadOnlyObject ds = (Csla.Core.IReadOnlyObject)bs.DataSource;

Although the XAML is similar to the WPF version, there are some subtle differences. In the Silverlight version, you use AutoPlay="False" to specify that you don t want the video to play automatically; in the WPF version, you set LoadedBehavior="Manual". You re also not going to set a source for the MediaElement; you ll do this programmatically in the code-behind. Listing 10.12 shows the On_Load event of the Silverlight media player.

The UI developer drags a CslaDataSource control onto a Web Form and interacts with it. While in Visual Studio, CslaDataSourceDesigner coordinates all that interaction, although in reality, all the hard work is done by CslaDesignerDataSourceView. The CslaDataSourceDesigner may open the CslaDataSourceConfiguration dialog to allow the user to configure some aspects of the control. When a control such as GridView is bound to the CslaDataSource, it requests schema information about the data source. This schema information is created and returned by the ObjectSchema, ObjectViewSchema, and ObjectFieldInfo objects. Finally, at runtime, the web form interacts with CslaDataSource to perform the actual data binding. All the hard work is actually handled by CslaDataSourceView, an instance of which is managed by the CslaDataSource control. The only bit of functionality that a UI developer will see is that CslaDataSource declares and raises four events. The UI developer must respond to these events to provide the interaction with the business object. Table 10-8 lists the events. Table 10-8. Events Raised by the CslaDataSource Control

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