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The aim of this chapter is to provide a brief introduction to Windows Forms and GDI+ graphics through a high-level overview of the relevant .NET libraries and a comparison with the Java classes that provide equivalent functionality. Anything more than an introduction is beyond the scope of this book; both the Windows Forms library and the GDI+ toolkit are sufficiently complex that full coverage would require a dedicated book. The coverage presented in this chapter provides enough information to allow a Java developer experienced in the Swing/JFC, Java AWT, and Java 2D APIs to quickly use the comparable .NET libraries; the .NET documentation should be consulted for the details of the individual topics discussed.
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The Windows Forms library is a toolkit for building UI applications for the Microsoft Windows operating system, equivalent in purpose to the Java AWT and Swing/JFC libraries. While Swing and the AWT are intended for cross-platform development, Windows Forms are clearly rooted in the Windows operating system; there is no support for different platform appearances or behaviors. The experienced Java programmer will have little problem adjusting to Windows Forms but will find the toolkit to be less flexible than Swing and the AWT. Forms provide fewer components, and it can be difficult to implement custom behavior using the provided classes.
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The central class in the Forms library is System.Windows.Forms.Form. This class represents top-level application windows and is the starting point for a UI application.
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Controls are added to a Form by creating the control instance and calling the Add method on the Form.Controls property. This property returns an instance of System.Windows.Forms.Control.ControlsCollection. When a Form is no longer required, the Dispose method must be called; it's important to ensure that the Dispose method is also called on any controls that the Form contains. The System.ComponentModel.Container class can be used to track a group of controls, and calling the Dispose method on the Container class ensures that Dispose is also called on all of the controls that have been added to the container. The following example demonstrates how to add a Button to a Form and how to ensure that controls are correctly disposed of; for more information on disposing of objects, see the "Destructors" section in 5, "Data Types." For an overview of controls included in the .NET Framework, see the "Control Overview" section later in this chapter.
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18. Graphics and UI using System.Drawing; using System.Windows.Forms; public class SimpleForm : Form { private System.ComponentModel.Container o_components = null; public SimpleForm() { o_components = new System.ComponentModel.Container(); Button x_button = new Button(); x_button.Text = "My Button"; Controls.Add(x_button); o_components.Add(x_button); } protected override void Dispose(bool p_disposing) { if(p_disposing) { if (o_components != null) { o_components.Dispose(); } } base.Dispose(p_disposing); } }
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Starting and Stopping a Forms Application
Windows Forms applications are started by calling the static Run method of the System.Windows.Forms.Application class, normally from the application Main method. The following fragment demonstrates how to run an instance of the SimpleForm class created earlier:
static void Main() { Application.Run(new SimpleForm()); }
A Forms application can be terminated either by calling the Application.Exit method or when the user clicks on the Close icon at the top of a form window.
Compiling
Compiling a Forms application using the command-line compiler is similar to compiling any other C# application. However, you should use the /target:winexe flag to specify that the output is a UI application. Applications built with the /target:exe flag will still work but will cause a command prompt to be displayed to the user alongside the main window. The following statement demonstrates how to compile the SimpleForm.cs file:
csc /target:winexe /out:MyApp.exe SimpleForm.cs
For more information about compiling C# classes, see 3, "Creating Assemblies."
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