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CHAPTER 5 CSLA . NET OBJECT TEMPLATES
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public object Fetch(SingleCriteria<EditableRoot, int> criteria) { EditableRoot result = new EditableRoot(); // load the new object with data based on the criteria MarkOld(result); return result; } public object Update(object obj) { // insert, update or delete the data for obj MarkOld(obj); return obj; } public void Delete(SingleCriteria<EditableRoot, int> criteria) { // delete data based on the criteria } } The object factory assumes complete responsibility for creating and interacting with the business object, including setting the object s state by calling the protected methods from the ObjectFactory base class: MarkNew() and MarkOld(). While the object factory model requires more code and effort, it does provide more flexibility, and it can provide better separation between the business and data access logic.
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Most applications will have some editable child objects, or even grandchild objects. Examples of these include the ProjectResource and ResourceAssignment objects from the Project Tracker reference application. In many cases, the child objects are contained within a child collection object, which I ll discuss later. In other cases, the child object might be referenced directly by the parent object. Either way, the basic structure of a child object is the same; in some ways, this template is similar to the editable root: [Serializable] public class EditableChild : BusinessBase<EditableChild> { #region Business Methods // TODO: add your own fields, properties, and methods // example with private backing field private static PropertyInfo<int> IdProperty = RegisterProperty(typeof(EditableChild), new PropertyInfo<int>("Id")); private int _Id = IdProperty.DefaultValue; public int Id { get { return GetProperty(IdProperty, _Id); } set { SetProperty(IdProperty, ref _Id, value); } }
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CH A PT ER 5 C SLA .NET O BJECT T EMPLAT ES
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// example with managed backing field private static PropertyInfo<string> NameProperty = RegisterProperty(typeof(EditableChild), new PropertyInfo<string>("Name")); public string Name { get { return GetProperty(NameProperty); } set { SetProperty(NameProperty, value); } } #endregion #region Validation Rules protected override void AddBusinessRules() { // TODO: add validation rules //ValidationRules.AddRule(RuleMethod, NameProperty); } #endregion #region Authorization Rules protected override void AddAuthorizationRules() { // TODO: add authorization rules //AuthorizationRules.AllowWrite(NameProperty, "Role"); } private static void AddObjectAuthorizationRules() { // TODO: add authorization rules //AuthorizationRules.AllowEdit(typeof(EditableChild), "Role"); } #endregion #region Factory Methods internal static EditableChild NewEditableChild() { return DataPortal.CreateChild<EditableChild>(); } internal static EditableChild GetEditableChild(object childData) { return DataPortal.FetchChild<EditableChild>(childData); } private EditableChild() { /* Require use of factory methods */ } #endregion
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CHAPTER 5 CSLA . NET OBJECT TEMPLATES
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#region Data Access protected override void Child_Create() { // TODO: load default values // omit this override if you have no defaults to set base.Child_Create(); } private void Child_Fetch(object childData) { // TODO: load values } private void Child_Insert(object parent) { // TODO: insert values } private void Child_Update(object parent) { // TODO: update values } private void Child_DeleteSelf(object parent) { // TODO: delete values } #endregion } As with all business classes, this one is serializable and inherits from a CSLA .NET base class. The fact that it is a child object is specified by the data portal calls to CreateChild() and FetchChild() in the factory methods. Behind the scenes, the data portal calls the MarkAsChild() method so the object is explicitly marked as a child, and if you choose not to use the data portal to create your child objects, you ll need to ensure manually that MarkAsChild() is called. The Business Methods region is the same as with a root object: it simply implements the properties and methods required by the business rules. Similarly, the Validation Rules and Authorization Rules regions are the same as with a root object. The Factory Methods region is a bit different. The factory methods are internal rather than public, as they should be called only by the parent object, not by the UI code. Also, there s no need for a static delete method, because BusinessBase implements a DeleteChild() method that BusinessListBase calls automatically when the child is removed from a collection. Perhaps most importantly, notice the data portal calls to CreateChild() and FetchChild() (rather than to Create() and Fetch()) in the factory methods. Also, notice how the GetEditableChild() method accepts a parameter containing child data. This parameter is passed from the parent and includes the data necessary to load this child object s field values. Normally this value will be a LINQ to SQL or ADO.NET Entity Framework entity object, an ADO.NET DataReader that is already pointing to the correct row of data, or something similar. And normally the parameter won t be of type object, but will be strongly typed. The biggest difference from a root object comes in the Data Access region. Instead of DataPortal_XYZ methods, a child object implements Child_XYZ methods. The Child_Create() method is implemented to
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