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There are many reasons why you should start learning about WCF today. The most important reason in our opinion is that you need to know how relevant your existing service-oriented applications will be with a new support infrastructure such as WCF. The questions you should be asking yourself are How will I build service-oriented applications in the future using WCF How do I preserve the existing investment that I have made in my XML Web services and .NET Remoting development What current technologies are going to be phased out in WCF Should I be using WSE 3.0 today The purpose of this chapter is to give you a preview of WCF from the perspective of where we are today with WSE 3.0. As you will see, every hour spent learning and working with WSE is a worthwhile investment that is directly applicable to Web service development with WCF. This should be of no surprise because WCF is still based on the standards and specifications that we are comfortable with today. WCF does not reinvent the WS- specifications or use exotic transport channels that we have never seen before. Instead, it provides a better support infrastructure for building service-oriented applications that implement today s important standards and specifications, including the WS- specifications. And best of all, WCF is strongly oriented toward services and messages.

Figure 10-5. CslaDataProvider and CslaDataProviderCommandManager This allows controls such as a button to route the appropriate command to the CslaDataProviderCommandManager, which invokes a method on the CslaDataProvider to do the actual work.

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IsReadOnly = True RaiseListChangedEvents = True End Sub #End Region End Class The Factory Methods region declares a Shared field to hold the list once it is retrieved. Notice how the factory method returns the cached list if it is present; it calls the data portal to retrieve the data only if the list is Nothing. You can also call an InvalidateCache() method to force a reload of the data if needed. This caching behavior is optional if it doesn t fit your need, then use a factory method, like this: Public Shared Function GetNameValueList() As NameValueList Return DataPortal.Fetch(Of NameValueList)() End Function The Data Access region contains only a DataPortal_Fetch() method, which calls the Data Access layer to retrieve the name/value data. The NameValueListBase class defines a strongly typed NameValuePair class, which is used to store each element of data. For each row of data from the database, a NameValuePair object is created and added to the collection. Notice the use of the IsReadOnly property to temporarily unlock the collection and then relock it so it becomes read-only once the data has been loaded. The RoleList class in the Project Tracker reference application illustrates a complete implementation of a name/value list.

Now that you ve mastered the basics, you ll be pleased to know that SQLite offers several additional functions for working with null The first of which is a workaround for the very limitation of nothing equals NULL that we ve just drilled in to you From SQLite v 3619, the is operator can be used to equate one NULL to another In the most basic form, you can run a simple query to ask SQLite if NULL is NULL: sqlite> select NULL is NULL; 1 As already mentioned, any value other than zero means true, so SQLite is happy to tell us that in this instance NULL really is the same as NULL But please, don t rely on this heavily.

The dynamic editable collection stereotype is designed to support a narrow and focused scenario in which the UI is a Windows Forms grid control that is data bound to the collection, and in which the user wants his changes to each row saved as soon as he moves off each row. This behavior is conceptually similar to some old Visual Basic behavior when using a DAO dynaset. In that case, changes made by the user to a row of data were automatically committed when the user navigated off that row in the UI. The CSLA .NET base class used in this stereotype is the EditableRootListBase (ERLB). A collection that inherits from ERLB contains editable root objects (though with a twist), so each object can be saved individually rather than in a batch. Although a collection that inherits from BusinessListBase saves all its child objects at once, a collection inheriting from ERLB saves each child one at a time. At a high level, the collection is responsible for containing a list of editable root objects. It is also responsible for retrieving all those objects at once but then saving them individually as the user inserts, updates, or deletes items in the list. The ERLB base class handles most of the hard work itself, so the template code is focused primarily on retrieving the objects and adding them to the collection. When looking at this code, remember that the child objects are a modified editable root stereotype called dynamic editable root objects. <Serializable()> _ Public Class DynamicRootList Inherits EditableRootListBase(Of DynamicRoot) #Region "Business Methods" Protected Overrides Function AddNewCore() As Object Dim item As DynamicRoot = DynamicRoot.NewDynamicRoot() Add(item) Return item End Function #End Region #Region "Authorization Rules"

change before the production release. You can read more about WCF at http://msdn.microsoft.com/ webservices/indigo/default.aspx. In addition, you can read about how to implement WCF in beta with a Go-Live license at http://msdn.microsoft.com/winfx/downloads/products/golive/.

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