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CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
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{ while (dr.Read()) Add(ReadOnlyChild.GetReadOnlyChild(dr)); } IsReadOnly = true; RaiseListChangedEvents = true; } #endregion } In the Authorization Rules region, there s just the CanGetObject() method for use by UI code. In the Factory Methods region, there s a factory method to return a collection loaded with data. It calls DataPortal.Fetch(), and so there s a Criteria class as well as a private constructor. This is no different from the classes you ve looked at already. Finally, the DataPortal_Fetch() method loads the object with data from the database. To do this, the IsReadOnly flag is set to false, the data is loaded from the database, and then IsReadOnly is set to true. When IsReadOnly is set to true, any attempt to add or remove items from the collection will result in an exception being thrown. Temporarily setting it to false allows the code to insert all the appropriate child objects into the collection. Also note that RaiseListChangedEvents is set to false and then true in a similar manner. To improve performance, this suppresses the raising of ListChanged events while the data is being loaded.
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Command Objects
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Command objects can be used in many ways. They may be called directly by UI code to execute arbitrary code on the application server, but even more often they are used within other business objects to execute code on the application server. A primary example is when a normal editable business object wants to implement an Exists() command. You ll see an example of this concept in the Project and Resource objects in 8. If the UI is to directly use the object, the class will be public, while if it is to be used within the context of another business object, it will be a private nested class within that business object. Either way, the structure of a command object is the same, as shown here: [Serializable()] class CommandObject : CommandBase { #region Authorization Methods public static bool CanExecuteCommand() { // TODO: customize to check user role //return ApplicationContext.User.IsInRole(""); return true; } #endregion #region Client-side Code // TODO: add your own fields and properties bool _result;
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public bool Result { get { return _result; } } private void BeforeServer() { // TODO: implement code to run on client // before server is called } private void AfterServer() { // TODO: implement code to run on client // after server is called } #endregion #region Factory Methods public static bool Execute() { CommandObject cmd = new CommandObject(); cmd.BeforeServer(); cmd = DataPortal.Execute<CommandObject>(cmd); cmd.AfterServer(); return cmd.Result; } private CommandObject() { /* require use of factory methods */ } #endregion #region Server-side Code protected override void DataPortal_Execute() { // TODO: implement code to run on server // and set result value(s) _result = true; } #endregion } This class structure is quite a bit different from anything you ve seen so far. The Authorization Rules region isn t bad it just implements a CanExecuteCommand() method so that the UI can easily determine whether the current user is authorized to execute the command. The Factory Methods region is similar to many of the other templates thus far in structure, but its implementation is different. Rather than passing a Criteria object to the server, the Execute() method creates and initializes an instance of the command object itself. That instance is then sent to the server through the data portal, which invokes the DataPortal_Execute() method on the server. The Execute() method also calls BeforeServer() and AfterServer() methods, which are found in the Client-side Code region.
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CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
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The idea behind this is that the command object can be initialized on the client with any data required to perform the server-side processing. In fact, the object could do some processing or data gathering on the client before or after it is transferred to the server through the data portal. The clientside code may be as complex as needed to prepare to run the server-side code. Then the data portal moves the object to the application server and calls the DataPortal_ Execute() method in the Server-side Code region. The code in this method runs on the server and can do any server-side work. This might be something as simple as doing a quick database lookup, or it might be a complex server-side workflow. The code in this method can create and interact with other business objects (all on the server, of course). It can interact directly with the database, or any other server-side resources, such as the server s file system or third-party software installed on the server. Command objects are powerful because they provide high levels of flexibility for running both client and server code in a coordinated manner.
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