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Console::KeyAvailable Property
.NET Framework (current version)
Gets a value indicating whether a key press is available in the input stream.
Assembly: mscorlib (in mscorlib.dll)
public: property bool KeyAvailable { [HostProtectionAttribute(SecurityAction::LinkDemand, UI = true)] static bool get(); }
| Exception | Condition |
|---|---|
| IOException | An I/O error occurred. |
| InvalidOperationException | Standard input is redirected to a file instead of the keyboard. |
The following example demonstrates how to use the KeyAvailable property to create a loop that runs until a key is pressed.
using namespace System; using namespace System::Threading; int main() { ConsoleKeyInfo cki; do { Console::WriteLine( "\nPress a key to display; press the 'x' key to quit." ); // Your code could perform some useful task in the following loop. However, // for the sake of this example we'll merely pause for a quarter second. while ( Console::KeyAvailable == false ) Thread::Sleep( 250 ); cki = Console::ReadKey( true ); Console::WriteLine( "You pressed the '{0}' key.", cki.Key ); } while ( cki.Key != ConsoleKey::X ); } /* This example produces results similar to the following: Press a key to display; press the 'x' key to quit. You pressed the 'H' key. Press a key to display; press the 'x' key to quit. You pressed the 'E' key. Press a key to display; press the 'x' key to quit. You pressed the 'PageUp' key. Press a key to display; press the 'x' key to quit. You pressed the 'DownArrow' key. Press a key to display; press the 'x' key to quit. You pressed the 'X' key. */
.NET Framework
Available since 2.0
Available since 2.0
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