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If you open EmployeeDomainService.cs, you will see the methods that have been generated for us. For both of the entity types we selected, there are methods to get the data (GetEmployees and GetOrder), insert new entity objects (InsertEmployee and InsertOrder), update existing objects (UpdateEmployee and UpdateOrder), and, finally, delete objects (DeleteEmployee and DeleteOrder). There are two things of note. By default the GetXXX methods return all the data in a table. This can be a lot of data, and it can be worth filtering the data using a LINQ query in the GetXXX method. If you don t, you run the risk of transferring large amounts of data from the server to the Silverlight client, which may be more than the network or the client can cope with. The second thing to note is that the other methods (InsertXXX, UpdateXXX, and DeleteXXX) are filled out for you but that the changes to the data model are not made permanent in the database without a call to the SaveChanges method. See 30 for details of this method and how to apply it. We are only going to be working with the Employees data, which is why it s called the domain service class, but I wanted to show you how a single service class can be used to provide access to more than one kind of entity data.

When you override a method, invoking the superclass method is almost always a good idea, in case it s doing more work than you re aware of. In this case, we have access to the source for Shape, so we know that all Shape does in its setFillColor: is stick the new color into an instance variable. But if we weren t so well versed in Shape, we wouldn t know if Shape was doing something else. And even though we know what Shape does now, we might not if the class is changed or enhanced later. By calling the inherited method, we make sure we get all the features it implements.

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If the type being defined implements one or more interfaces, the type declaration has an additional clause, the implements clause, as shown here: .class <flags> <dotted_name> extends <class_ref> implements <class_refs> { ... } The nonterminal symbol <class_refs> simply means a comma-separated list of class references: <class_refs> ::= <class_ref>[,<class_ref>*] For example: .class public MyNamespace.MyClass extends MyNamespace.MyClassBase implements MyNamespace.IOne, MyNamespace.ITwo, MyNamespace.IThree { ... }

The code in this chapter runs from the Macros dialog box. To work from a UserForm, you need to modify each sample. For example, change code from this: Public Sub TestUserInput() Dim strInput As String With ThisDrawing.Utility .InitializeUserInput 1, "Line Arc Circle laSt" strInput = .GetKeyword(vbCr & "Option [Line/Arc/Circle/laSt]: ") .Prompt "You selected '" & strInput & "'" End With End Sub to this: Private Sub CommandButton1_Click() Dim strInput As String Me.Hide With ThisDrawing.Utility .InitializeUserInput 1, "Line Arc Circle laSt" strInput = .GetKeyword(vbCr & "Option [Line/Arc/Circle/laSt]: ") MsgBox "You selected '" & strInput & "'" End With Me.Show End Sub Programs written using the full version of Visual Basic 6 or VBA 6.3 (AutoCAD 2002 and later) are not limited to modal dialog forms. But sometimes it may make sense to hide the form while interacting with the user at the AutoCAD command prompt. Try to think like your users when you design the interaction process and your forms behavior.

A few things are wrong with the classical Singleton pattern implementation shown in the previous section: A singleton is only a singleton in its own AppDomain. Other AppDomains would need to instantiate their own singleton, causing potential data consistency issues. For example, imagine having to share configuration information in multiple AppDomains. It isn t easily possible to shut down a singleton, and therefore data might be lost. Every class that wants to be a singleton needs to implement a singleton type class structure, requiring changes. To make the class thread-safe, additional code is needed. In general, implementing a singleton using the classical approach isn t that versatile, even though for a confined context it works extremely well. The point to remember is that its scope its limited. Let s see how to implement a versatile singleton.

Listing 32-1. The Contents of Program.cs using using using using System; System.Collections.Generic; System.Linq; System.Windows.Forms;

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An interface can specify methods, properties, events, and indexers for classes to implement. In this section, I ll show you the format for each of them and demonstrate their implementation.

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