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The Project class itself has a static method called Exists(), which is public so it can be called from UI code: public static bool Exists(Guid id) { ExistsCommand result; result = DataPortal.Execute<ExistsCommand> (new ExistsCommand(id)); return result.Exists; } While this code is somewhat like other factory methods, it is different in one key way. It creates an instance of an ExistsCommand object, and has the data portal execute the object on the application server: result = DataPortal.Execute<ExistsCommand> (new ExistsCommand(id)); Notice how the id parameter value is used to initialize the ExistsCommand object as it is created. The important thing to understand is that the ExistsCommand object is created and initialized on the client, and then the data portal transfers the object to the server where the object s DataPortal_ Execute() method is run.

It is important to realize that the n-level undo capability implemented in the framework is optional and is designed to incur no overhead if it is not used.

Summary

This means that a command object can do work on the client, then do work on the server, and then do more work on the client. In this particular case, it is initialized on the client, executes a stored procedure on the server, and then exposes the result as a property back on the client. That result value is returned as the result of the Exists() method.

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In this chapter we took you on a broad tour of how to start working with Azure. The SDK is important to be able to build Azure applications, including all of the different tools, APIs, and documentation needed to get started. In a few pages, if you were following along, you developed and deployed a web application. Before either of us started using Windows Azure, we had never been able to deploy a web application with several load-balanced nodes without weeks or months of meetings, arguments, and planning the deployment and the production configuration.

Consider the case of an Invoice object that contains a collection of LineItem objects. The Invoice itself contains data that the user can edit plus data that s derived from the collection. The TotalAmount property of an Invoice, for instance, is calculated by summing up the individual Amount properties of its LineItem objects. Figure 2-2 illustrates this arrangement.

The real work occurs in the command object itself: ExistsCommand. The ExistsCommand class inherits from Csla.CommandBase and is declared as a private nested class within Project: [Serializable()] private class ExistsCommand : CommandBase Not all command objects are nested within other business classes, but in this case, it makes sense. There s no need for the UI developer to be aware of the ExistsCommand class or its implementation details; they only need to know about the Project.Exists() method. In other cases, you may have public command objects that are directly used by the UI. A good example would be a ShipOrder object that is responsible for shipping a sales order. It is quite realistic to expect that the UI would want to directly ship a sales order, and so there s value in being able to call a ShipOrder.Ship(orderId) method. Command objects, whether public or private, tend to be very simplistic in terms of their structure. ExistsCommand declares some instance fields, one property, and a constructor: private Guid _id; private bool _exists; public bool Exists { get { return _exists; } } public ExistsCommand(Guid id) { _id = id; } The constructor initializes the _id field, so that value is available when the command is executed on the server. The _exists field is set as a result of the command running on the server and is exposed through the Exists property. The code that runs on the server is entirely contained within the DataPortal_Execute() method: protected override void DataPortal_Execute() { using (SqlConnection cn = new SqlConnection(Database.PTrackerConnection)) { cn.Open(); using (SqlCommand cm = cn.CreateCommand()) { cm.CommandType = CommandType.StoredProcedure; cm.CommandText = "existsProject"; cm.Parameters.AddWithValue("@id", _id); int count = (int)cm.ExecuteScalar(); _exists = (count > 0); } } }

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