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The ReadOnlyBindingList(Of C) class implements a read-only collection based on System. ComponentModel.BindingList(Of T). The standard BindingList(Of T) class implements a read-write collection that supports data binding, but there are numerous cases in which a read-only collection is useful. For example, ReadOnlyBindingList is the base class for Csla.ReadOnlyListBase, Csla. NameValueListBase, and Csla.Validation.BrokenRulesCollection. This class inherits from BindingList(Of T). It is also Serializable and MustInherit, like all the framework base classes: <Serializable()> _ Public MustInherit Class ReadOnlyBindingList(Of C) Inherits System.ComponentModel.BindingList(Of C) Implements Core.IBusinessObject End Class All the basic collection and data binding behaviors are already implemented by BindingList. Making the collection read-only is a matter of overriding a few methods to prevent alteration of the collection. Of course, the collection has to be read-write at some point in order to get data into the collection at all. To control whether the collection is read-only, there s a field and a property: Private _isReadOnly As Boolean = True Public Property IsReadOnly() As Boolean Get Return _isReadOnly End Get Protected Set(ByVal value As Boolean) _isReadOnly = value End Set End Property Notice that although the IsReadOnly property is Public for reading, it is Protected for changing. This way, any code can determine whether the collection is read-only or read-write, but only a subclass can lock or unlock the collection. The class contains a constructor that turns off the options to edit, remove, or create items in the collection by setting some properties in the BindingList base class: Protected Sub New() AllowEdit = False AllowRemove = False AllowNew = False End Sub The rest of the class overrides the methods in BindingList that control alteration of the collection. Each override checks the IsReadOnly property and throws an exception when an attempt is made to change the collection when it is in read-only mode.

The only complicated overrides are ClearItems() and RemoveItem(). This is because AllowRemove is typically set to False and must be temporarily changed to True to allow the operation (when the collection is not in read-only mode). For instance, here s the ClearItems() method: Protected Overrides Sub ClearItems() If Not IsReadOnly Then Dim oldValue As Boolean = AllowRemove AllowRemove = True MyBase.ClearItems() DeferredLoadIndexIfNotLoaded() _indexSet.ClearIndexes() AllowRemove = oldValue Else Throw New NotSupportedException(My.Resources.ClearInvalidException) End If End Sub 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 the Source Code area of the Apress website (www.apress.com) 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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Unpack the SQLite tarball: tar -xzvf sqlite-amalgamation-3.6.23.1.tar.gz Move into the unpacked directory: cd sqlite-3.6.23.1 Create the makefile: ./configure Other options, such as the installation directory, are also available. For a complete list of configure options, run this: ./configure --help

Note The feature you know as Secure Conversation uses several WS- specifications, including WS-Trust,

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.

7. 8.

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