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IBindingListView is not implemented in CSLA .NET, but you can find an implementation in the CSLAcontrib library at www.codeplex.com/CSLAcontrib.
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Because BusinessListBase and the other CSLA .NET collection base classes ultimately inherit from BindingList<T>, they automatically provide full support for data binding.
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CHAPTER 10 DATA B INDING
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It is important to realize, however, that BindingList<T> doesn t do everything necessary for a collection to work within the CSLA .NET framework. For example, BusinessListBase implements extra features to support n-level undo and abstract persistence, as discussed in s 13 and 15. Also, as I discussed in 9, BusinessListBase includes code to raise a ListChanged event when one of its child objects raises a PropertyChanged event. This is used after the deserialization of the collection, and is necessary because BindingList<T> doesn t handle the deserialization scenario. By implementing the interfaces listed in Table 10-1 and inheriting from BindingList<T>, the CSLA .NET base classes provide full support for all the features of Windows Forms data binding. This includes the drag-and-drop concepts in the Visual Studio designer, along with the runtime behaviors for interacting with a BindingSource control and supporting in-place editing in grid controls.
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Controls and Helper Objects
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Though the interfaces and base classes I ve discussed so far provide support for data binding, it turns out that the UI often still contains quite a bit of code to make data binding really work. Some of this code works around quirks in the behavior of data binding itself or in how it interacts with editable business objects. And some extends the UI to deal with the concept of per-property authorization a feature I ll discuss in 12. To minimize the code required in the UI, CSLA .NET includes three custom controls for Windows Forms that address the most common issues. These controls are a type of control called an extender control. Extender controls are added to a form, and they in turn add properties and behaviors to other controls on the form, thus extending those other controls. A good example of this is the ErrorProvider control, which extends other controls by adding the ability to display an error icon with a tooltip describing the error.
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The ReadWriteAuthorization Control
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In 12, I will discuss the authorization feature supported by CSLA .NET business objects that makes them aware of whether each property can be read or changed. A key part of that implementation is the IAuthorizeReadWrite interface defined in Csla.Core. This interface defines CanReadProperty() and CanWriteProperty() to make it possible to determine whether the current user is allowed to get or set each property on the object. One primary user of this functionality is the UI, which can decide to alter its appearance to give users clues as to whether they re able to view or alter each piece of data. While you could do this by hand for each control on every form, the ReadWriteAuthorization control helps automate the process of building a UI that enables or disables controls based on whether properties can be read or changed. If a control is bound to a property, and the user does not have read access to that property due to authorization rules, the ReadWriteAuthorization control will disable that control. It also adds a handler for the control s Format event to intercept the value coming from the data source, substituting an empty value instead. The result is that data binding is prevented from displaying the data to the user. Similarly, if the user doesn t have write access to a property, ReadWriteAuthorization will attempt to mark any controls bound to that property as being read-only (or failing that, disabled), ensuring that the user can t attempt to alter the property value. Like all Windows Forms components, extender controls inherit from System.ComponentModel. Component. Additionally, to act as an extender control, the ReadWriteAuthorization control must implement the IExtenderProvider interface. [DesignerCategory("")] [ProvideProperty("ApplyAuthorization", typeof(Control))] public class ReadWriteAuthorization : Component, IExtenderProvider
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