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Console.KeyAvailable() Property in C#
  • Last Updated : 05 May, 2021

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 returns false. 
 

Exceptions: 

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

Example:  

C#






// C# Program to demonstrate
// 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);
    }
}
}

Output: 

Reference: 

 

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