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CHAPTER 2 s FRAMEWORK DESIGN
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As before, the UI code remains simple: Dim cust As Customer = Customer.GetCustomer(myCriteria) The class-in-charge model requires that you write Shared factory methods in each class, but keeps the UI code simple and straightforward. It also takes full advantage of .NET s ability to pass objects across the network by value, thereby minimizing the plumbing code in each object. Overall, it provides the best solution, which will be used (and explained further) in the chapters ahead.
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For more than a decade, Microsoft has included some kind of data binding capability in its development tools. Data binding allows developers to create forms and populate them with data with almost no custom code. The controls on a form are bound to specific fields from a data source (such as a DataSet or a business object). With .NET 2.0, Microsoft has dramatically improved data binding for both Windows Forms and Web Forms. The primary benefits or drivers for using data binding in .NET development include the following: Data binding offers good performance, control, and flexibility. Data binding can be used to link controls to properties of business objects. Data binding can dramatically reduce the amount of code in the UI. Data binding is sometimes faster than manual coding, especially when loading data into list boxes, grids, or other complex controls. Of these, the biggest single benefit is the dramatic reduction in the amount of UI code that must be written and maintained. Combined with the performance, control, and flexibility of .NET data binding, the reduction in code makes it a very attractive technology for UI development. In both Windows Forms and Web Forms, data binding is read-write, meaning that an element of a data source can be bound to an editable control so that changes to the value in the control will be updated back into the data source as well. Data binding in .NET 2.0 is very powerful. It offers good performance with a high degree of control for the developer. Given the coding savings gained by using data binding, it s definitely a technology that needs to be supported in the business object framework.
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Enabling the Objects for Data Binding
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Although data binding can be used to bind against any object or any collection of homogeneous objects, there are some things that object developers can do to make data binding work better. Implementing these extra features enables data binding to do more work for us, and provide the user with a superior experience. The .NET DataSet object, for instance, implements these extra features in order to provide full data binding support to both Windows Forms and Web Forms developers.
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The IEditableObject Interface
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All editable business objects should implement the interface called System.ComponentModel. IEditableObject. This interface is designed to support a simple, one-level undo capability, and is used by simple forms-based data binding and complex grid-based data binding alike. In the forms-based model, IEditableObject allows the data binding infrastructure to notify the business object before the user edits it, so that the object can take a snapshot of its values. Later, the application can tell the object whether to apply or cancel those changes, based on the
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CHAPTER 2 s FRAMEWORK DESIGN
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user s actions. In the grid-based model, each of the objects is displayed in a row within the grid. In this case, the interface allows the data binding infrastructure to notify the object when its row is being edited, and then whether to accept or undo the changes based on the user s actions. Typically, grids perform an undo operation if the user presses the Esc key, and an accept operation if the user presses Enter or moves off that row in the grid by any other means.
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