C# 0 The Complete Reference

TextReader

 that underlies 

Console.In

, you 

will invoke those methods as shown in this example.

Using ReadKey( )

Beginning with version 2.0, the .NET Framework has included a method in 

Console

 that 

enables you to read individual keystrokes directly from the keyboard in a non-line-buffered 

manner. This method is called 

ReadKey( )

. When it is called, it waits until a key is pressed. 

When a key is pressed, 

ReadKey( )

 returns the keystroke immediately. The user does not need 

to press 

ENTER

. Thus, 

ReadKey( )

 allows keystrokes to be read and processed in real time.

ReadKey( )

 has these two forms.

static ConsoleKeyInfo ReadKey( )

static ConsoleKeyInfo ReadKey(bool 

noDisplay

)

The first form waits for a key to be pressed. When that occurs, it returns the key and also 

displays the key on the screen. The second form also waits for and returns a keypress. 

However, if 

noDisplay

 is true, then the key is not displayed. If 

noDisplay

 is false, the key 

is displayed.

ReadKey( )

 returns information about the keypress in an object of type 

ConsoleKeyInfo

,

which is a structure. It contains the following read-only properties.

char KeyChar

ConsoleKey Key

ConsoleModifi ers Modifi ers

www.freepdf-books.com

---

370

 

P a r t   I :  

T h e   C #   L a n g u a g e