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The ValidationRules class is the primary class in the Csla.Validation namespace. Every business object that uses the validation rules functionality will contain its own ValidationRules object. ValidationRules relies on the other classes in Csla.Validation to do its work. Together, these classes maintain the list of rules for each property and the list of currently broken rules.

The first part of the foreign key instructs SQLite that the type_id column references the id column of the food_types table From there, you move on to the integrity action clause, which does most of the hard work In this example, you ve used the option on delete restrict This instructs SQLite to prevent any deletion from the food_types table that would leave a food in the foods table without a parent food id restrict is one of five possible actions you can define The full set is as follows:.

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You ve already seen how a business rule is defined based on the RuleHandler delegate. A key part of what ValidationRules does is keep a list of such rule methods for each of the business object s properties. To do this, it relies on two other classes: ValidationRulesManager and SharedValidationRulesManager. The ValidationRulesManager class keeps a list of rules for each property. One way ValidationRulesManager is used is to keep a list of rules that is unique for each instance of a business object. This means that each time a business object is created, a set of rules can be associated with the properties of that particular instance. This has a pretty big impact on performance and memory consumption, and it s usually not the right approach. However, sometimes objects really do need unique rules, and this class enables that scenario. Another way ValidationRulesManager is used is by the SharedValidationRulesManager class, because it keeps a list of rules for each business type. The SharedValidationRulesManager class keeps a list of rules for each property that is common across all instances of a business object type. This means that the first time an instance of a given business class is created, the rules are associated with the properties of that type. The resulting associations are cached for the lifetime of the application and are shared by all instances of that business class. This has good performance and minimal memory consumption, and it s the recommended approach.

exe utility, and allows you to generate proxy class files for clients to use for accessing your service Typed channels are independent of the actual objects that process the service request WCF employs Service Manager objects that are responsible for mapping typed channels to their associated business objects, including the DialogManager and ListenerManager objects The WCF service layer automatically handles the receiving, processing, and sending of messages, including all of the serialization work that is required to build and process a message This is very similar to the way that the ASP NET infrastructure processes messages that are received and sent via an asmx Web page WCF provides the Service object for its services, which is conceptually equivalent to the ASP NET WebService object The Service object provides you with programmatic access to the underlying messaging and transport infrastructure.

CSLA.NET version 2.1 introduced the shared rules concept in response to performance and memory issues caused by the original per-instance rule technique.

set null: Change any remaining child value to NULL if the parent value is removed or changed to no longer exist. set default: Change any remaining child value to the column default if the parent value is removed or changed to no longer exist. cascade: Where the parent key is updated, update all child keys to match. Where it is deleted, delete all child rows with the key. Pay particular attention to this option, because cascading deletes can surprise you when you least expect them. restrict: Where the update or delete of the parent key would result in orphaned child keys, prevent (abort) the transaction. no action: Take a laid-back approach, and watch changes fly by without intervening. Only at the end of the entire statement (or transaction if the constraint is deferred) is an error raised. Lastly, SQLite supports the deferrable clause, which controls whether the constraint as defined will be enforced immediately or deferred until the end of the transaction.

As you ll see in 17 when I show how to create the example business library, I typically only use shared rules.

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