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Each of these values describes the buttons that will be included in a message box For example, if mbb contains YesNo, then the Yes and No buttons are included in the message box The value returned by Show( ) indicates which button was pressed It will be one of these values, defined by the DialogResult enumeration:
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Your program can examine the return value to determine the course of action the user desires For example, if the message box prompts the user before overwriting a file, your program can prevent the overwrite if the user clicks Cancel, and it can allow the overwrite if the user clicks OK The following program adds a stop button and a message box to the preceding example In the stop button handler, a message box is displayed that asks the user if he or she wants to stop the program If the user clicks Yes, the program is stopped If the user clicks No, the program continues running
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// Add a stop button using System; using SystemWindowsForms; using SystemDrawing; class ButtonForm : Form { Button MyButton; Button StopButton; public ButtonForm() { Text = "Adding a Stop Button"; // Create the buttons MyButton = new Button(); MyButtonText = "Press Here"; MyButtonLocation = new Point(100, 200); StopButton = new Button(); StopButtonText = "Stop"; StopButtonLocation = new Point(100, 100); // Add the button event handlers to the window MyButtonClick += MyButtonClick; ControlsAdd(MyButton); StopButtonClick += StopButtonClick; ControlsAdd(StopButton); } [STAThread] static void Main() { ButtonForm skel = new ButtonForm(); ApplicationEnableVisualStyles(); ApplicationRun(skel); } // Handler for MyButton void MyButtonClick(object who, EventArgs e) { if(MyButtonTop == 200) MyButtonLocation = new Point(10, 10); else
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PART II
Part II:
Exploring the C# Library
MyButtonLocation = new Point(100, 200); } // Handler for StopButton void StopButtonClick(object who, EventArgs e) { // If user answers Yes, terminate the program DialogResult result = MessageBoxShow("Stop Program ", "Terminate", MessageBoxButtonsYesNo); if(result == DialogResultYes) ApplicationExit(); } }
Let s look closely at how the message box is used Inside the ButtonForm constructor, a second button is added This button contains the text Stop, and its event handler is linked to StopButtonClick( ) Inside StopButtonClick( ), the message box is displayed by the following statement:
// If user answers Yes, terminate the program DialogResult result = MessageBoxShow("Stop Program ", "Terminate", MessageBoxButtonsYesNo);
Here, the message inside the box is Stop Program , the caption is Terminate, and the buttons to be displayed are Yes and No When Show( ) returns, the user s response is assigned to result That response is then examined by the following statement to determine the course of action:
if(result == DialogResultYes) ApplicationExit();
If the user clicks the Yes button, the program is stopped by calling ApplicationExit( ), which causes the immediate termination of the program Otherwise, no action is taken, and the program continues running Sample output is shown in Figure 26-3
FIGURE 26-3 Sample output from the Stop Button program
26:
Use SystemWindowsForms
Adding a Menu
The main window of nearly all Windows applications includes a menu across the top This is called the main menu The main menu typically contains top-level categories, such as File, Edit, and Tools From the main menu descend drop-down menus, which contain the actual selections associated with the categories When a menu item is selected, a message is generated Therefore, to process a menu selection, your program will assign an event handler to each menu item Because menus are such a bedrock resource in Windows programming, many options are available and the topic of menus is quite large Fortunately, it is easy to create a simple main menu Originally, there was only one way to create a main menu: by using the classes MainMenu and MenuItem, both of which inherit the Menu class These classes create the traditionalstyle menus that have been used in Windows applications for years This approach is still supported However, version 20 of the NET Framework added a second way to add menus to a window by using a set of classes based on ToolStrip, such as MenuStrip and ToolStripMenuItem Menus based on ToolStrip have many additional capabilities and give a modern look and feel Understand, though, that both approaches to menus are currently valid for new C# applications Because there are two ways to create menus, both ways are described here, beginning with the traditional approach
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