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from the UI helps create a more abstract and loosely coupled implementation, thus providing better flexibility.
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The class-in-charge approach is a variation on the Factory design pattern, in which a factory method is responsible for creating and managing an object. In many cases, these factory methods are static methods that may be placed directly into a business class hence the class-in-charge moniker.1
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In this model, I make use of the concept of static factory methods on a class. A static method can be called directly without requiring an instance of the class to be created first. For instance, suppose that a Customer class contains the following code: [Serializable()] public class Customer { public static Customer NewCustomer() { var factory = new ChannelFactory<BusinessService.IBusinessService>("BusinessService"); try { var proxy = factory.CreateChannel(); using (proxy as IDisposable) { return = proxy.CreateNewCustomer (); } } finally { factory.Close(); } } } The UI code could use this method without first creating a Customer object, as follows: Customer cust = Customer.NewCustomer(); A common example of this tactic within the .NET Framework itself is the Guid class, whereby a static method is used to create new Guid values, as follows: Guid myGuid = Guid.NewGuid(); This accomplishes the goal of making the UI code reasonably simple; but what about the static method and passing objects by value Well, the NewCustomer() method contacts the application server and asks it to create a new Customer object with default values. The object is created on the server and then returned back to the NewCustomer() code, which is running on the client. Now that the object has been passed back to the client by value, the method simply returns it to the UI for use.
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1. Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley, 1995) by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides
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CHAPTER 2 FRAMEWORK DE SIGN
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Likewise, you can create a static method in the class in order to load an object with data from the data store as shown: public static Customer GetCustomer(string criteria) { var factory = new ChannelFactory<BusinessService.IBusinessService>("BusinessService"); try { var proxy = factory.CreateChannel(); using (proxy as IDisposable) { return = proxy.GetCustomer (criteria); } } finally { factory.Close(); } } Again, the code contacts the application server, providing it with the criteria necessary to load the object s data and create a fully populated object. That object is then returned by value to the GetCustomer() method running on the client and then back to the UI code. As before, the UI code remains simple: Customer cust = Customer.GetCustomer(myCriteria); The class-in-charge model requires that you write static 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 is used (and refined further) in the chapters ahead.
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Supporting Data Binding
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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 an entity object, a DataSet, or a business object). Data binding is provided in WPF, 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.
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