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protected override void ClearItems() { if (!IsReadOnly) { bool oldValue = AllowRemove; AllowRemove = true; base.ClearItems(); DeferredLoadIndexIfNotLoaded(); _indexSet.ClearIndexes(); AllowRemove = oldValue; } else throw new NotSupportedException(Resources.ClearInvalidException); } The original AllowRemove value is restored after the operation is complete. Notice the call to DeferredLoadIndexIfNotLoaded(), which triggers recreation of any indexes being maintained by LINQ to CSLA. LINQ to CSLA is discussed in 14. This completes all the types in the Csla.Core namespace. You can look at the full implementation of each type by downloading the code from www.apress.com/book/view/1430210192 or www.lhotka.net/ cslanet/download.aspx. Also, s 7 through 16 cover many of the concepts and code in more detail.
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In this chapter I started discussing the implementation of the CSLA .NET framework. This chapter walked through the overall project structure, including the folders and namespaces used to organize the code and types in the framework. It also provided some detail around the types in the Csla and Csla.Core namespaces. You can start to see how the framework supports features such as the following: Data binding Business and validation rules Authorization rules Object status tracking Parent-child object relationships Editable and read-only objects N-level undo Object persistence and the data portal s 7 through 16 provide more detail about the implementation of each major framework feature. From 17 on, the focus is on building the simple business application designed in 3 to illustrate how the classes in the framework can be used to build applications based on business objects.
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hapter 6 introduced the idea of the PropertyInfo<T> class from the Csla namespace. This type allows a business object to declare metadata about the object s properties, and most importantly, it helps eliminate the use of a string literal to reference the property name throughout the business class. While a business developer could use standard .NET property declaration syntax, it would require him to invoke the authorization, business, and validation rules; processing; and data binding behaviors of CSLA .NET manually in each property. To simplify the code required to utilize all these behaviors, CSLA .NET supports a coding model that is more abstract, allowing the framework to do much of the work automatically. The syntax is similar to that of a dependency property in WPF or WF, but the implementation behind the scenes is quite different. This chapter will focus on how CSLA .NET manages property metadata and helps a business object manage its property values to simplify and standardize business object code.
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You have quite a few options for declaring a property in a CSLA .NET business object, and I ll walk you through all the details. You can choose to declare your own private backing fields, or you can allow CSLA .NET to manage the values of your properties. Before getting into those options in detail, I ll briefly walk through one common option so you get a feel for the overall structure. Most properties are declared like this: private static PropertyInfo<string> NameProperty = RegisterProperty(new PropertyInfo<string>("Name")); public string Name { get { return GetProperty(NameProperty); } set { SetProperty(NameProperty, value); } } The RegisterProperty() method registers the property s metadata with CSLA .NET, so the framework is aware of the property. Internally, CSLA .NET maintains a list of all the IPropertyInfo objects for each business object type. These values are static, so all instances of the type share one list. The field manager subsystem in the Csla.Core.FieldManager namespace maintains the list of IPropertyInfo objects. I ll discuss the field manager later in the chapter. The GetProperty() and SetProperty() methods help minimize the code you would otherwise have to write to trigger authorization, business, and validation rules; status tracking; and data binding.
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