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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.

In a manner similar to validation rules, authorization rules are managed by an AuthorizationRules object. The BusinessBase class collaborates with AuthorizationRules to implement authorization rules for each property. To simplify usage of this feature, BusinessBase encapsulates and abstracts the underlying behavior. Step one is to declare a field and property for the rules: [NotUndoable()] private Security.AuthorizationRules _authorizationRules; protected Security.AuthorizationRules AuthorizationRules { get { if (_authorizationRules == null) _authorizationRules = new Security.AuthorizationRules(); return _authorizationRules; } } BusinessBase also declares a virtual AddAuthorizationRules() method that the business developer can override in a business class. The business developer should write code in this method to specify which roles are allowed and denied access to read and write specific properties: protected virtual void AddAuthorizationRules() { } The BusinessBase constructor automatically calls AddAuthorizationRules() so any role-property relationships are established when the object is first created. The BusinessBase class also defines methods so both the business object developer and UI developer can find out whether the current user is allowed to read or write to a specific property. The CanReadProperty() methods indicate whether the user can read a specific property, while the CanWriteProperty() methods do the same for altering a property. Both have several overloads. Only the CanReadProperty() methods will be shown here, and you can look at the CanWriteProperty() methods in the downloaded code. The primary CanReadProperty() implementation enforces the authorization rules for a property, making use of the AuthorizationRules object: [EditorBrowsable(EditorBrowsableState.Advanced)] public virtual bool CanReadProperty(string propertyName) { bool result = true; if (AuthorizationRules.HasReadAllowedRoles(propertyName)) { // some users are explicitly granted read access // in which case all other users are denied. if (!AuthorizationRules.IsReadAllowed(propertyName)) result = false; } else if (AuthorizationRules.HasReadDeniedRoles(propertyName)) { // some users are explicitly denied read access. if (AuthorizationRules.IsReadDenied(propertyName)) result = false; } return result; }

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One of the useful things about active patterns is that they let you use pattern matching with existing .NET object types. For example, the .NET object type System.Type is a runtime representation of types in .NET and F#. Here are the members found on this type: type System.Type with member IsGenericType : bool member GetGenericTypeDefinition : unit -> Type member GetGenericArguments : unit -> Type[] member HasElementType : bool member GetElementType : unit -> Type member IsByRef : bool member IsPointer : bool member IsGenericParameter : bool member GenericParameterPosition : int This type looks very much like one you d like to pattern match against. There are clearly three or four distinct cases here, and pattern matching will help you isolate them. You can define an active pattern to achieve this, as shown in Listing 9-4. Listing 9-4. Defining an Active Pattern for Matching on System.Type Values let (|Named|Array|Ptr|Param|) (typ : System.Type) = if typ.IsGenericType then Named(typ.GetGenericTypeDefinition(),typ.GetGenericArguments()) elif typ.IsGenericParameter then Param(typ.GenericParameterPosition) elif not typ.HasElementType then Named(typ, [| |]) elif typ.IsArray then Array(typ.GetElementType(),typ.GetArrayRank()) elif typ.IsByRef then Ptr(true,typ.GetElementType()) elif typ.IsPointer then Ptr(false,typ.GetElementType()) else failwith "MSDN says this can't happen"

The AuthorizationRules object can maintain a list of roles explicitly granted access to a property, and a separate list of roles explicitly denied access This algorithm first checks to see if there are any roles granted access, and if so, it assumes all other roles are denied On the other hand, if no roles are explicitly granted access, it assumes all roles have access except those in the denied list Notice that the method is virtual, so a business developer can override this behavior to implement a different authorization algorithm if needed The CanWriteProperty() method operates in the same manner and is also virtual As with the PropertyHasChanged() method earlier in the chapter, the CanReadProperty() implementation requires a string parameter indicating the property name That forces the use of literal strings in the business object, which should be avoided for maintainability.

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