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CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
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Console.Write("CONTROL+"); } if ((keyInfo.Modifiers & ConsoleModifiers.Shift) != 0) { Console.Write("SHIFT+"); } Console.WriteLine(keyInfo.Key); // see if we have to break the loop if (keyInfo.KeyChar == 'x') { Console.WriteLine("Stoppping"); break; } } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } I have used the version of the ReadKey method that takes a bool parameter. If the parameter is true, the key press is not echoed to the console screen. I read the modifiers from the ConsoleKeyInfo struct and check to see whether each of the modifiers defined in the ConsoleModifiers enumeration has been pressed more than one can be pressed at once, of course, so it is important to test for each value. The ConsoleModifiers enum contains the values Alt, Shift, and Control. I use the Console.Write method to build up a line of text to display to the user, starting with the modifier keys that have been pressed. I use the ConsoleKeyInfo.Key property to get details of the key that has been pressed. This property returns a value from the ConsoleKey enum, which has values defined for every possible key press and has the nice touch of printing a description of the key pressed when converted to a string, so, for example, the left arrow is described as LeftArrow. Finally, I check to see whether the x key has been pressed, and if it has, then I break out of the while loop that has been reading key presses. Compiling and running Listing 26-7 (and pressing some keys) produces the following output: Start pressing keys - press 'x' key to stop You pressed: H You pressed: E You pressed: L You pressed: L You pressed: O You pressed: CONTROL+SHIFT+H You pressed: CONTROL+SHIFT+E You pressed: CONTROL+SHIFT+L You pressed: CONTROL+SHIFT+L You pressed: CONTROL+SHIFT+O You pressed: X Stoppping Press enter to finish
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CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
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Making the Console Beep
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You can make a beeping noise using the Console.Beep method. There are two forms of this method, described in Table 26-3. Table 26-3. Methods for Making Beep Noises
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Method
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Beep() Beep(int, int)
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Description
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Makes a single beep at 800 hertz for 200 milliseconds Makes a single beep at the specified frequency and duration
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Listing 26-8 provides a demonstration of using both forms of the Beep method. Listing 26-8. Making the Console Beep using System; class Listing 08 { static void Main(string[] args) { Console.Beep(); Console.Beep(850, 200); Console.Beep(900, 200); Console.Beep(950, 200); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }
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Modifying the Appearance of the Console
The Console class has a number of members that let you control the appearance of the command window that the user sees. Table 26-4 describes some of these members. Table 26-4. Console Members That Control Command Window Appearance
Member
BackgroundColor CursorVisible
Description
Gets or sets the background color for the console Gets or sets whether the console cursor is visible
CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
Member
ForegroundColor ResetColor() Title WindowHeight WindowLeft
Description
Gets or sets the foreground color for the console Resets the foreground and background colors Sets the title for the console window Gets or sets the height of the console window on the screen Gets or sets the left position of the console window on the screen Gets or sets the top position of the console window on the screen Gets or sets the width of the console window on the screen
WindowTop
WindowWidth
The BackgroundColor and ForegroundColor properties use values from the System.ConsoleColor enum, which defines values for 16 colors: Black, White, Red, and so on. Listing 26-9 demonstrates changing the appearance of the console and then restoring it again. Listing 26-9. Modifying the Appearance of the Command Window using System; class Listing 09 { static void Main(string[] args) { Console.WriteLine("Press Enter to change appearance"); Console.ReadLine(); // get the settings that we want to restore to int originalWidth = Console.WindowWidth; string originalTitle = Console.Title; // change the appearance of the console Console.BackgroundColor = ConsoleColor.White; Console.ForegroundColor = ConsoleColor.Black; Console.WindowWidth = 40; Console.Title = "Introduction to C#"; // prompt the user to change things back Console.WriteLine("Press Enter to restore appearance"); Console.ReadLine(); // reset the appearance Console.ResetColor();
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