Console.KeyAvailable() Property in C#

Console.KeyAvailable Property is used to get a value which shows whether a key press is available in the input stream. This property does not block input until a key press is available.

Syntax: public static bool KeyAvailable { get; }
Property Value: It will return true if a key press is available otherwise, it retuns false.

Exceptions:



  • InvalidOperationException: If the standard input is redirected to a file instead of the keyboard.
  • IOException: If an I/O error occured.

Example:

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// C# Program to demostrate 
// KeyAvailable property
using System;
using System.Threading;
  
namespace GFG {
  
class GFG {
  
    public static void Main()
    {
        // declare a new ConsoleKeyInfo object
        ConsoleKeyInfo c = new ConsoleKeyInfo();
  
        // outer loop to work until 'z' is pressed
        do {
            Console.WriteLine("\nPress a key to display; "+
                              "press the 'z' key to quit.");
  
            // inner loop to check whether a key 
            // is pressed using KeyAvailable 
            while (Console.KeyAvailable == false)
  
                // Loop until input is entered.
                Thread.Sleep(50); 
            c = Console.ReadKey(true);
            Console.WriteLine("You pressed the '{0}' key.", c.Key);
  
        } while (c.Key != ConsoleKey.Z);
    }
}
}

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Output:

Reference:



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