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The envelope is the root element of the message XML. It contains the message body and message header elements. The body element is required for all SOAP messages. It contains qualified XML for the request and response messages. The header contains optional extended information for the SOAP message. The WS- specification settings are stored in the header. The SOAP fault information, if present, is retrieved from the envelope and returned by the Fault property as an Exception class. The Context property enables you to modify the SOAP message contents within a custom WSE filter or to process the SOAP message contents within a SoapReceiver processing class.

Note If you do not use managed backing fields to store your child object references, you ll need to override this method to also check the IsDirty status of your child objects. I recommend always using managed backing fields for child references so you don t need to worry about this issue.

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Before diving into syntax, let s get situated with the obligatory example database. The database used in this chapter (and the rest of this book, for that matter) consists of all the foods in every episode of Seinfeld. If you ve ever watched Seinfeld, you can t help but notice a slight preoccupation with food. There are more than 400 different foods mentioned in the 180 episodes of its history (according to fan data spread far and wide on the Internet). That s more than two new foods every show. Subtract commercial time, and that s virtually a new food introduced every 10 minutes.

Where IsSelfDirty provides the status for one object, IsDirty is often more useful because it provides the status for the object and all its child objects.

This chapter concluded with a brief look at how to generate and work with WSDL documents. In the following two chapters, we will give you a detailed look at how to build message-oriented Web services and how to work with WSDL documents and XSD schema definition files.

An object is considered to be valid if it has no currently broken validation rules. The Csla.Validation namespace is covered in 11 and provides management of the business rules. The IsSelfValid property merely exposes a flag indicating whether the object currently has broken rules or not. There s also an IsValid property that reflects whether the current object, or any of its child objects, are invalid. Here s the IsSelfValid code, which returns a value for only this object, not counting its child objects: <Browsable(False)> _ Public Overridable ReadOnly Property IsSelfValid() As Boolean Get Return ValidationRules.IsValid End Get End Property As with IsSelfDirty, this property is marked with the Browsable attribute, so data binding defaults to ignoring the property. There are no methods to directly control whether an object is valid. The validity of an object is managed by the business and validation rules subsystem discussed in 11. However, this method is Overridable, so it is possible to replace or extend the way CSLA .NET manages the concept of validity if you so desire.

As it turns out, this preoccupation with food works out nicely because it makes for a database that illustrates all the requisite concepts of SQL and of using SQL in SQLite. Figure 3-1 shows the database tables for our sample database.

While IsSelfValid indicates the validity of a specific object, the true validity of an object must also include the validity of any child objects. Even if an object itself is valid, if it contains invalid child objects, the object graph as a whole must be considered invalid. The IsValid property combines the IsSelfValid result with the IsValid results of any child objects contained by this object:

Figure 3-1. The Seinfeld food database The database schema, as defined in SQLite, is defined as follows: create table episodes ( id integer primary key, season int, name text ); create table foods( id integer primary key, type_id integer, name text ); create table food_types( id integer primary key, name text ); create table foods_episodes( food_id integer, episode_id integer ); The main table is foods. Each row in foods corresponds to a distinct food item, the name of which is stored in the name attribute. The type_id attribute references the food_types table, which stores the various food classifications (e.g., baked goods, drinks, or junk food). Finally, the foods_episodes table links foods in foods with the episodes in episodes.

<Browsable(False)> _ Public Overridable ReadOnly Property IsValid() As Boolean Get Return IsSelfValid AndAlso _ (_fieldManager Is Nothing OrElse FieldManager.IsValid()) End Get End Property Again, the FieldManager is used to determine whether any child objects are invalid. The result is that a business object is considered valid only if it and all its child objects are valid.

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