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This property is designed to create an instance of the FieldDataManager only on demand. The idea is that if your business class never uses any managed backing fields, no FieldDataManager object will be created. I chose to do this to minimize the overhead involved in creating a business object when managed fields aren t used. This does complicate the use of the FieldManager property throughout the rest of BusinessBase and ReadOnlyBase. For example, BusinessBase includes this code: Public Overridable ReadOnly Property IsDirty() As Boolean Get Return IsSelfDirty OrElse _ (_fieldManager IsNot Nothing AndAlso FieldManager.IsDirty()) End Get End Property A parent object is considered dirty, or changed, if it or any of its child objects have been changed. To know whether the object has been changed, the IsDirty property checks the FieldManager to find out whether any managed fields or child objects have been changed. But before accessing the FieldManager property, it checks to see whether the _fieldManager field is Nothing. This prevents the accidental creation of a FieldDataManager instance when there are no managed fields in the business object. Getting back to the FieldManager property, you should see that a method called UndoableBase. ResetChildEditLevel() is called after the FieldDataManager instance is created. Technically, the FieldDataManager is a child object contained within the business object. Because it is a child object, its edit level for n-level undo must be kept in sync with the business object itself. I ll discuss the concept of edit levels in 11. For now, it is enough to know that the ResetChildEditLevel() call ensures that the new child object is in sync with its parent.

There are two ways to import data, depending on the format of the data in the file to import. If the file is composed of SQL, you can use the .read command to execute the commands contained in the file. If the file contains comma-separated values (CSV) or other delimited data, you can use the .import [file][table] command. This command will parse the specified file and attempt to insert it into the specified table. It does this by parsing each line in the file using the pipe character (|) as the delimiter and inserting the parsed columns into the table. Naturally, the number of parsed fields in the file should match up with the number of columns in the table. You can specify a different delimiter using the .separator command. To see the current value set for the separator, use the .show command. This will show all user-defined settings for the shell, among them the current default separator: sqlite> .show echo: explain: headers: mode: nullvalue: output: separator: width: off off on column "" stdout "|"

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Service agents do the manual legwork of communicating with external services and implementing whatever infrastructure is required to do so This is useful for two important reasons: Business objects do not have to implement the infrastructure that is required to communicate with an external service Instead, they communicate their requests to a local assembly (the service agent) using a mutually understood interface Business objects avoid the maintenance work that is required to keep service interactions up-to-date For example, if an external Web services interface changes, the service agent takes care of updating its proxy class and reworking the code implementation as needed The business object can continue to communicate with the service agent in the same manner, even as the underlying communication details change We cannot resist using a travel analogy to describe the role that service agents play Let s say you and a friend are traveling in Madrid.

The FieldDataManager class itself is relatively complex. Each instance of this class is a child of a business object. Also, because the field manager is responsible for storing the values of the business object s properties, it must participate in the n-level undo process discussed in 11. Here s the declaration of the class: <Serializable()> _ Public Class FieldDataManager Implements IUndoableObject Implements IMobileObject End Class The class is Serializable, because the data it contains may be serialized when the business object is cloned or moved across the network between a client and application server. It implements the IUndoableObject interface because it must participate in the n-level undo behaviors covered in 11.

The .read command is the way to import files created by the .dump command. Using file.sql created earlier as a backup, we can drop the existing database objects (the test table and schema view) and re-import it as follows: sqlite> drop table test; sqlite> drop view schema; sqlite> .read file.sql

The IMobileObject interface exists to support serialization through the MobileFormatter, which is part of CSLA .NET for Silverlight. CSLA .NET for Silverlight is outside the scope of this book, and IMobileObject has no impact on how CSLA .NET works within the .NET runtime.

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