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GDI+ causes the Graphics class to update the screen after every drawing operation, which can be seen by the user as screen flicker; this flickering can be eliminated by a technique known as double buffering, whereby the drawing operations are applied to a Graphics instance held in memory and then copied to the screen in a single operation. Double buffering can be enabled by using the SetStyle method from the System.Windows.Forms.Control class; this method accepts an argument from the System.Windows.Forms.ControlStyles enumeration, as shown in the following code fragment:
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SetStyle(ControlStyles.DoubleBuffer, true);
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Flickering can also occur because the contents of a Graphics instance are cleared automatically before a component is asked to repaint itself. This feature can be disabled by specifying the ControlStyles.UserPaint and ControlSyles.AllPaintingInWmPaint values in the SetStyle method. The following statement demonstrates how to completely eliminate flicker:
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SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
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Double buffering can also be performed programmatically by executing drawing operations on an in-memory bitmap, as shown in the following example:
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18. Graphics and UI protected override void OnPaint(PaintEventArgs p_event) { Bitmap x_bitmap = new Bitmap(Width, Height); Graphics x_offscreen = Graphics.FromImage(x_bitmap); // drawing operations p_event.Graphics.DrawImage(x_bitmap, 0, 0); x_bitmap.Dispose();
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The Bitmap instance is created by specifying the dimensions of the area to draw; in the example, we use the Width and Height properties from the Control class. The off-screen Graphics instance is retrieved from the Bitmap, and the drawing operations are then applied without causing the screen to be updated. Finally, the contents of the Bitmap are drawn to the screen using the Graphics.DrawImage method; it's important to ensure that the Dispose method is called on the Bitmap to ensure that unmanaged resources are released. The flicker caused by the automatic clearing of the contents of a specific component can be prevented by overriding the Control.OnPaintBackground method and providing an empty method body.
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The Windows Forms toolkit has fewer features than Swing and can be more difficult to use but does have the advantage of producing applications that cannot be distinguished from native programs, something that can be difficult to do in a Java application. The GDI+ library allows for complex 2D operations, providing functionality similar to that of the Java 2D library. Overall, graphics and UI programming with .NET follows a model similar to that for Java, but there is a good deal of opportunity for third-party developers to fill out the feature set with advanced components.
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19. Introduction to XML Web Services
19. Introduction to XML Web Services
Microsoft .NET XML Web services are supported by Microsoft Internet Information Service (IIS) versions 5.0 and later. It's important that IIS be already installed on a machine before the .NET installation is performed: the .NET installer recognizes that IIS is installed and establishes the bindings that allow Microsoft ASP.NET and XML Web services to function. If IIS is installed later, the .NET Framework must be removed and reinstalled. The XML Web service support in .NET is provided by ASP.NET, a component of .NET that is outside the scope of this book. ASP.NET is used by IIS to invoke XML Web services; however, the details and features of ASP.NET aren't required to write XML Web services. Visual Studio .NET includes extensive support for working with XML Web services, including tight integration with IIS; for more information, consult the Visual Studio documentation. In this chapter, however, we demonstrate how to build and deploy XML Web services using the command-line tools included with the .NET SDK. The .NET support for XML Web services abstracts building and deploying XML Web services from the underlying standards and protocols; however, for clarity, Table 19-1 includes simple definitions of the key technologies.
Table 19-1. Key Elements of the .NET Framework XML Web Services
Technology XML Web services
Description A component that exposes functionality through Internet protocols. Simple Object Access An XML-based protocol for exchanging structured and typed Protocol (SOAP) information on the Web. Messages between clients and XML Web services are usually encoded using SOAP. Web Services Description An XML-based contract language that defines the services Language (WSDL) offered by an XML Web service. Universal Description, A protocol for advertising the existence, location, and features of Discovery, and Integration XML Web services. (UDDI) ASP.NET An element of the .NET Framework used to build server-based Web applications.
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