.net barcode Classes Required to Implement the CslaDataSource Control in VB.NET

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Table 10-7. Classes Required to Implement the CslaDataSource Control
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Class
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CslaDataSource CslaDataSourceView CslaDataSourceConfiguration CslaDataSourceDesigner CslaDesignerDataSourceView ObjectSchema ObjectViewSchema
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Description
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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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ObjectFieldInfo
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Figure 10-7 provides a helpful diagram that illustrates how these classes relate to each other. 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 control may open the CslaDataSourceConfiguration dialog box to allow the user to configure some aspects of the control. When a control such as GridView is bound to 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.
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CHAPTER 10 DATA B INDING
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Figure 10-7. Relationship between the classes in CslaDataSource 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.
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Table 10-8. Events Raised by the CslaDataSource Control
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Event
SelectObject InsertObject UpdateObject DeleteObject
Description
Requests that the UI provide a reference to the business object that is the data source Requests that the UI insert a new business object based on the data from the form Requests that the UI update a business object with the data from the form, based on the key value provided Requests that the UI delete the business object based on the key value provided
These four events are directly analogous to the four method names required by the ASP.NET ObjectDataSource. Rather than using reflection to invoke a set of methods, I opted to raise events, because this is an easier programming model in my opinion. With the ObjectDataSource, the UI developer must implement four methods (or defer to those in an ADO.NET TableAdapter), while with CslaDataSource, the developer simply handles these four events. There is a custom EventArgs class for each of the events: SelectObjectArgs, InsertObjectArgs, UpdateObjectArgs, and DeleteObjectArgs, respectively. Each one provides properties that are used within the event handler. The end result is a fully functional data source control that understands CSLA .NET style business objects. UI developers can use this control to leverage the data binding support of ASP.NET Web Forms when working with rich business objects.
C HAPTE R 10 DA TA BINDIN G
Conclusion
In this chapter, I discussed how CSLA .NET supports data binding for the Windows Forms, WPF, and Web Forms user interface technologies. For simple objects, this involves the implementation of a number of interfaces, including the following: INotifyPropertyChanging INotifyPropertyChanged IEditableObject IDataErrorInfo For collections and lists, this involves the use of either BindingList(Of T) or ObservableCollection(Of T). Since all three UI technologies support BindingList(Of T), while only WPF supports ObservableCollection(Of T), the CSLA .NET framework is based on the use of BindingList(Of T). By providing support for data binding in the framework, CSLA .NET ensures that all business objects created using the framework fully support the features of data binding in all major UI technologies. This helps reduce the complexity of the business objects as well as the amount of code required to create a UI that uses the objects. s 11 through 16 will continue the coverage of the implementation of CSLA .NET. Then, from 17 on, the focus will be on building the simple business application designed in 3 to illustrate how the classes in the framework can be used to build applications based on business objects.
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