rdlc data matrix

rdlc data matrix

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There are three objects here: the explicitly declared b and the implicitly declared DecoratorA and Component objects. The Display method receives the DecoratorA object and invokes its Operation method (line 55). This takes it to the DecoratorB object. On line 42, the object that DecoratorB was composed with has its Operation invoked, and the basic string I am walking was returned (line 15). Continuing on, DecoratorB adds the bit about walking to school (line 43), and then DecoratorA adds listening to Classic FM (line 28). This completes the call to Display. As can be seen on line 82, the result is the opposite of line 81 because the decorators were composed in a different order. However, that is not all. Decorators can define new behavior, which can be invoked explicitly. We do this on line 71, which results in the second line of output (line 83) about buying a cappuccino. That, in a nutshell, is how decorators work. Decorators do not need any advanced language features; they rely on object aggregation and interface implementation. Now, let s consider a real-world example.

You ve seen in the previous sections how ASP.NET and ADO.NET can be used to connect to databases and manipulate the data therein through connections, commands, and readers. However, most modern applications require flexible, graphical access to the same data. As a developer, you aren t going to want to develop all of this complex data access and binding code from the ground up. ASP .NET provides controls that give you visual- and designer-based access to data through data binding, but all of them use a DataSource control to provide access to the underlying database. Because we are using SQL Server data in this example, the SQL Server specific DataSource control will be used. You aren t limited to using this control, because .NET provides several others, such as ObjectDataSource and XMLDataSource, but these go beyond the scope of this chapter. Still, the principles that you learn from the SqlDataSource control will apply across all data sources when data binding is taken into context.

Portlets handle requests differently than servlets. With a servlet, there is one request per response a browser asks for a URL, and the servlet container processes the HTTP request and passes HTTPServletRequest and HTTPServletResponse objects to the servlet. Then the servlet normally calls its doGet() or doPost() methods to generate a response, and the response is sent back to the client s web browser. With portals, there can be one or more portlets supplying content for each portal page served to the user s web browser. Even though the end user can click a link or submit a form for only one portlet at a time, the other portlets may still need to refresh their content to reflect any changes that have been made in the meantime to the underlying data model that would be reflected in the content. Because of this, portlets must handle two different types of requests: an action request and a render request. You can think of the action request as asking the

The implementation of a simple Template Method program is shown in Example 7-5. It follows the UML of Figure 7-5, with the Algorithm containing the TemplateMethod and going through the IPrimitives interface to the two classes that implement it. In the main method, the Algorithm s Template Method is called with objects of ClassA and ClassB in turn, with different results. The TemplateMethod knows that it must call Operations on an object of type IPrimitives, but it does not have to know which class exactly.

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When you are using Visual Studio or Visual Web Developer Express, open the Designer to edit any ASP .NET page. You will see a Data tab on the Toolbox. This tab contains the SqlDataSource control. Drag and drop it onto the design surface, and its Tasks pane will open (see Figure 4-19).