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Implement the IRuleSource interface in your business class to create a custom Validation Rule Source. Custom Validation Rule Sources allow you to store Validation Rules in the database. We recommend that you use this technique if you need to frequently customize Validation Rules in a deployed application, but you cannot redeploy the application or customize its Application Model.
Note
Persistent validation rules are in action only if the application’s database has been created and initialized. In debug mode, a new XAF application creates its database on the first login attempt (when a user clicks the Log In button for the first time). For these reasons, if you define a persistent validation rule that affects the login form, this rule will not work until you complete the login process at least once.
Refer to the following help topic for information on other techniques to declare Validation Rules: Declare Validation Rules.
The IRuleSource interface declares the following members:
The Validation Module automatically collects persistent Validation Rule Sources and Rules when you start an application. Persistent Validation Rule Sources and Rules are persistent classes that implement the IRuleSource and IRule interfaces accordingly. Built-in Rule Sources query the database each time before validation occurs. Use the EnableRuntimeRuleCache property to enable Rule caching for all persistent Rule Sources. You can also disable automatic collection of persistent Rules and Rule Sources and add custom proxy Rule Sources with different behavior. To see the example of how to do this, refer to the following property description: EnableRuntimeRuleDiscovery.
In the IRuleSource.CreateRules method, create a RuleRequiredField Validation Rule based on the values of the RuleRequiredFieldPersistent class public properties.
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