asp.net data matrix reader

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So how can you make the Sort method work with objects of type MyClass To implement an interface, a class or struct must do two things: It must list the interface name in its base class list. It must provide an implementation for each of the interface s members. For example, the following code updates MyClass to implement interface IComparable. Notice the following about the code: The name of the interface is listed in the base class list of the class declaration. The class implements a method called CompareTo, whose parameter type and return type match those of the interface member. Method CompareTo is implemented following the definition given in the interface s documentation. That is, it returns a negative 1, positive 1, or 0, depending on its value compared to the object passed into the method. Interface name in base class list class MyClass : IComparable { public int TheValue; public int CompareTo(object obj) // Implementation of interface method { MyClass mc = (MyClass)obj; if (this.TheValue < mc.TheValue) return -1; if (this.TheValue > mc.TheValue) return 1; return 0; } } Figure 17-2 illustrates the updated class. The arrow from the grayed interface method to the class method indicates that the interface method does not contain code, but is implemented by the class-level method.

return true; } AcceptChanges doesn t move any data to the database (only an adapter can do that); it simply copies current values over original values. The same null checking logic you saw earlier needs to be built into this method as well.

The optional pre-, post-, and exception data portal methods can also be implemented if desired. But the DataPortal_Execute() method is the important one, since that is where the business developer writes the code to implement the non-interactive back-end processing. I ll make use of CommandBase in 8 when implementing the sample application objects.

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The MultiView control contains two View controls, named MainView and InsertView. Only one of these views will be active (visible) at any time, so this form really defines two different views for the user. Within your code, you select the view by setting the ActiveViewIndex property of the MultiView control to the numeric index of the appropriate View control. Of course, using a numeric value like this doesn t lead to maintainable code, so within the page, I define an enumerated type with text values corresponding to each View control: Private Enum Views MainView = 0 InsertView = 1 End Enum The Views type will be used to change the page view as needed.

Figure 9-8. This clipping of the StyleFinder cover from 1995 shows the first appearance of the FontShuffle categories.

Control layer will reside within a specific interface and will not be available to any other interfaces that you might create later Any business logic written into, say, a WPF interface is useless to a web or service interface and must therefore be written into those as well This instantly leads to duplicated code, which is a maintenance nightmare You can separate these two layers through techniques such as clearly defined procedural models or object-oriented design and programming In this book, I ll show how to use object-oriented concepts to help separate the business logic from the interface It is important to recognize that a typical application will use business logic in a couple of different ways Most applications have some user interaction, such as forms in which the user views or enters data into the system.

Note To get the examples in this chapter running on real hardware, you need to change the pin numbers

As you can see in the preceding listing, we are accomplishing the following:

Most applications also have some very non-interactive processes, such as posting invoices, relieving inventory, or calculating insurance rates Ideally, the Business layer will be used in a very rich and interactive way when the user is entering data directly into the application For instance, when a user is entering a sales order, she expects that the validation of data, the calculation of tax, and the subtotaling of the order will happen literally as she types This implies that the Business layer can be physically deployed on the client workstation or on the web server to provide the high levels of interactivity users desire To support non-interactive processes, on the other hand, the Business layer often needs to be deployed onto an application server, or as close to the database server as possible.

The Microsoft.Web.Services2 namespace provides a class called SoapEnvelope, which you use for generating SOAP messages in code. The SoapEnvelope class derives from the System.Xml.XmlDocument class, not surprisingly, and so it supports XML document loading, so that you can load preformatted SOAP messages into a SoapEnvelope object. Alternatively, you can construct the SOAP message from scratch by setting properties on the SoapEnvelope object.

Note The using statement is different than the using directives. The using directives are covered in

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