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The CriteriaBase class supports the creation of custom criteria objects as described in 5. Custom criteria classes must implement the ICriteria interface, and CriteriaBase merely simplifies that process. The ICriteria interface ensures that a custom criteria object can provide the data portal with the Type object representing the type of business object to be created, retrieved, or deleted. SingleCriteria is a subclass of CriteriaBase. I discuss it later in this chapter. The Criteria class is defined like this: <Serializable()> _ Public Class CriteriaBase Inherits Csla.Core.MobileObject Implements ICriteria End Class
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CHAPTER 5 NETWORK COMMUNICATION
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Another common approach is to put all of the business logic into the UI. The data is validated and manipulated in the UI, and the Data Storage layer just stores the data. This approach, as shown in Figure 1-11, is very common in both Windows and web environments, and has the advantage that the business logic is centralized into a single tier (and of course, one can write the business logic in a language such as C# or VB .NET).
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Table 19-1 provides the problem/solution summary for this chapter. I ll show you the most important members and how to use them for each of the main collection interfaces and classes. Collections are exceptionally useful, and you will find yourself using them frequently. This is a chapter that is worth reading carefully to ensure you understand how each of the collection types differs and where they can best be used in your programs.
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Let s start with an interdependent drop-down list example. This page displays two drop-down lists. The first is a list of cities. When the user makes a selection from the list of cities, the second list is populated with a list of pool halls in that city. This is an example of something you can easily do with a postback. For the sake of performance and usability, we ll show you how do it with client-side script instead, eliminating the need for a round trip to the server. This shows how, starting with some static script code that embodies the functionality you want, underlying data can be dynamically generated on the server. You ll start with this simple script, which represents an example of what you want to produce. You ll write code to write this code. You ll use this as a starting point, the same way you d use a wire frame screen shot as a starting point for presentation tier development. You may also want to review the finished product, scripting1.aspx, in the Web04 project, to get an idea of where you re headed. <html> <head> <SCRIPT LANGUAGE="JavaScript"> listsB = new Array; valuesB = new Array; listsB[0] = new Array; listsB[0][0] = "A J Billiard Parlor"; listsB[0][1] = "Campus Room"; listsB[0][2] = "Champion Billiards"; valuesB[0] = new Array; valuesB[0][0] = "33"; valuesB[0][1] = "34"; valuesB[0][2] = "35"; listsB[1] = new Array; listsB[1][0] = "Amsterdam Billiard Club"; listsB[1][1] = "Bernardos Billar and Cafeteria"; listsB[1][2] = "Billiard Club"; listsB[1][3] = "Broadway Billiard Cafe";
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An event declaration requires the name of a delegate type. You can either declare one or use one that already exists. If you declare a delegate type, it must specify the signature and return type of the methods that will be stored by the event. A better idea is to use the predefined delegate type used by the .NET BCL and designated as the standard for use with events. You are strongly encouraged to use it. It is the EventHandler delegate, and its declaration is shown in the following code. Delegate EventHandler is covered in more detail later in this chapter. public delegate void EventHandler(object sender, EventArgs e);
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PTPrincipal is a custom principal object that can be assigned as the current principal on the Thread object and in the HttpContext. s 9 and 10 will demonstrate how to configure the Thread and HttpContext to use this object in the UI, but first you should understand how the PTPrincipal class is created. Within .NET, the principal object is the centerpiece for authorization. The object must implement System.Security.Principal.IPrincipal, which defines an Identity property and an IsInRole() method. Default implementations are implemented in Csla.Security.BusinessPrincipalBase, and so PTPrincipal inherits from that class: [Serializable()] public class PTPrincipal : Csla.Security.BusinessPrincipalBase Principal objects typically have a constructor that accepts the identity object that represents the user s identity, and PTPrincipal is no exception: private PTPrincipal(IIdentity identity) : base(identity) { } The BusinessPrincipalBase class also has a constructor that requires an identity object. This object is used to implement the Identity property in that base class, so it doesn t need to be implemented in PTPrincipal. The IsInRole() method is a bit more complex, however. To implement this method, the principal object must have the list of roles to which the user belongs. Of course, the identity object actually represents the user s identity and profile, and so it most likely contains the list of roles for the user as
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