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As discussed in 2, most business objects will be validating data based on various business rules. The actual implementation to manage an object s validation rules and maintain a list of broken business rules will be discussed later in the Csla.Validation section. However, the BusinessBase class encapsulates that behavior and exposes it in an easy-to-use manner.
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The validation rules and broken rules will be managed by a ValidationRules object, and BusinessBase will collaborate with this object to manage all validation rule behaviors. A reference to this object is kept by BusinessBase, and is exposed through a property:
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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private Validation.ValidationRules _validationRules; protected Validation.ValidationRules ValidationRules { get { if (_validationRules == null) _validationRules = new Csla.Validation.ValidationRules(this); return _validationRules; } } The property implements a lazy loading approach, so the ValidationRules object is created only on first use. This is ideal, since an object that doesn t use any of the validation rules functionality won t even incur the overhead of creating the object. The ValidationRules object maintains a list of validation rules for each property on the object. These rules are configured by the business developer in an AddBusinessRules() method, defined in BusinessBase and overridden in the business class: protected virtual void AddBusinessRules() { } This method is called when the object is created through the constructor in the BusinessBase class: protected BusinessBase() { AddBusinessRules(); AddAuthorizationRules(); } An AddAuthorizationRules() method is also called, and will be discussed shortly in the Authorization Rules section. AddBusinessRules() must also be called when the business object is deserialized. This will happen after a clone operation or when the object moves across the network via the data portal. It is not efficient to try to maintain the list of rule delegates for each property during serialization and deserialization. Instead, when the object is deserialized, it can simply call AddBusinessRules() to reestablish the rule references: [OnDeserialized()] private void OnDeserializedHandler(StreamingContext context) { ValidationRules.SetTarget(this); AddBusinessRules(); OnDeserialized(context); } [EditorBrowsable(EditorBrowsableState.Advanced)] protected virtual void OnDeserialized(StreamingContext context) { // do nothing - this is here so a subclass // could override if needed } The [OnDeserialized()] attribute is used to tell the .NET serialization infrastructure to call this method once deserialization is complete. This attribute comes from the System.Runtime. Serialization namespace, and is one of a set of attributes you can use to decorate methods that are to be called by the .NET Framework during the serialization and deserialization of an object.
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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Inside this method, the AddBusinessRules() method is called. Before that, however, the ValidationRules object needs to be given a reference to the business object so it can properly apply the validation rules to the properties. Finally, a virtual OnDeserialized method is invoked so the business developer can respond to the deserialization operation if desired. The ValidationRules object maintains a list of currently broken rules. This was used earlier in the implementation of the IsValid property, but there s value in exposing the collection itself: [Browsable(false)] [EditorBrowsable(EditorBrowsableState.Advanced)] public virtual Validation.BrokenRulesCollection BrokenRulesCollection { get { return ValidationRules.GetBrokenRules(); } } Within ValidationRules, this collection is implemented to be read-only. Even though the collection is exposed as a public property, it can t be changed by the UI. However, the UI can display the list of broken rules to the user if so desired.
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System.ComponentModel.IDataErrorInfo
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Windows Forms data binding uses the IDataErrorInfo interface to interrogate a data source for validation errors. This interface allows a data source, such as a business object, to provide humanreadable descriptions of errors at the object and property levels. This information is used by grid controls and the ErrorProvider control to display error icons and tooltip descriptions. The ValidationRules object will provide a list of broken rules for each property on the object, making it relatively easy to implement IDataErrorInfo: string IDataErrorInfo.Error { get { if (!IsValid) return ValidationRules.GetBrokenRules().ToString(); else return String.Empty; } } string IDataErrorInfo.this[string columnName] { get { string result = string.Empty; if (!IsValid) { Validation.BrokenRule rule = ValidationRules.GetBrokenRules().GetFirstBrokenRule(columnName); if (rule != null) result = rule.Description; } return result; } } The Error property returns a text value describing the validation errors for the object as a whole. The indexer returns a text value describing any validation error for a specific property. In this implementation, only the first validation error in the list is returned. In either case, if there are no errors, an empty string value is returned telling data binding that there are no broken rules to report.
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