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Chief among the behaviors is the GetMethod() method. This method is used to locate a specific method on the business class or object. Once the method has been located, other code can retrieve the attributes for that method, or the method can be invoked. This method is somewhat complex. Recall that the data portal will call strongly typed methods based on the type of criteria object provided by the business object s factory method. This means that GetMethod() must locate the matching method on the business class not only by method name, but by checking the parameter types as well. The process flow is illustrated in Figure 4-8.

On the whole, I think that the Ajax methodology brings a lot of benefits. It can improve the usability of websites by providing very fast responses to user actions without refreshing the whole page. At the same time, this new approach also presents a number of challenges. One of the features of Ajax applications is a reduced number of individual page loads. The downside to this state-saving technology is that it interferes with browsing conventions such as using the back button or being able to bookmark individual pages. The ability to update just part of a page also alters user expectations. Ideally, every action taken by the user should have a clear and obvious result. Web designers must rise to the challenge of providing meaningful feedback when the user initiates a request to the server and when the server provides a response. The key to building a successful Ajax application is to treat it like adding any other JavaScript enhancement. Apply progressive enhancement in order to provide graceful degradation.

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Table 3-1. Basic Types and Literals (Continued)

Most business applications need to retrieve and display lists of name/value data. Commonly this data is displayed in combo box or list controls, and is used to validate user entry to ensure the values are within the list. A common example is customer payment terms. Customers are required to pay invoices within a certain amount of time: net 30 for 30 days, net 60 for 60 days, COD for cash on delivery, and so forth. An application dealing with customer payments will almost certainly have a table in the database containing the list of valid payment terms. This list will be displayed to the user on various forms and pages, and is used to ensure that every Customer object s PaymentTerms property is one of the items in the list. It is quite practical to use the ReadOnlyListBase class from 3 to create your own name/value list. But this is such a common application requirement that it is better to create a more targeted base class to further minimize the code required to implement name/value lists. The Csla.NameValueListBase provides this targeted abstraction. A business developer can construct a name/value list like this: [Serializable()] public class PaymentTerms : Csla.NameValueListBase<int, string> { private PaymentTerms() { } public static PaymentTerms GetList() { return DataPortal.Fetch<PaymentTerms>( new Criteria(typeof(PaymentTerms))); }

private void DataPortal_Fetch(Criteria criteria) { IsReadOnly = false; // load data from database IsReadOnly = true; } } The goal of the NameValueListBase class is to allow the business developer to write as little code as possible when implementing a strongly typed name/value list. As you can see, the developer needs only to create a private constructor, a factory method, and the DataPortal_Fetch() method, which contains the data access code to load the list with data.

64-bit unsigned integers Machine-sized signed integers Machine-sized unsigned integers 32-bit IEEE floating-point 64-bit IEEE floating-point High-precision decimal values Arbitrarily large integers Arbitrary-precision rationals The type with only one value

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