How to check if a key is being pressed in c# (console app)

Question

So i`m trying to create a piano game. where specific keys act like the piano keys.For example: if "A" is being pressed playback audio file for note C if "s" is being pressed playback audio file for note D and so on. I wrote this:

piano:         
 if (pressedKey.Key == ConsoleKey.A) ;
             {
                 Console.Beep();


                 {
                     goto piano;

the beep will be replaced with the audio file this is just for testing. So when the program reaches this piece of code and i hit "a" it starts beeping over and over and it wont stop until the program is closed. I want it to beep once every time I hit "A". How do I achieve this? Sorry for the dumb question and bad English.

You have VERY little code here, but you appear to be causing an infinite loop as soon as you press the 'A' key. You're hitting the A key, which returns to piano, which remembers the old key, because you never checked again. Btw, `goto` is evil. :) — Khale_Kitha, Feb 16 '16 at 20:00
@redFIVE it seems so: http://stackoverflow.com/questions/6545720/does-anyone-still-use-goto-in-c-sharp-and-if-so-why — rene, Feb 16 '16 at 20:01
@rene those are all pretty weak arguments for its usefulness, in my opinion — user1231232141214124, Feb 16 '16 at 20:05
`I think my eyes just got sick`, don't use `goto` in C# code this is not `COBOL` — MethodMan, Feb 16 '16 at 20:06
I'm more with [this outcome](http://stackoverflow.com/a/2486630/578411) @redFIVE — rene, Feb 16 '16 at 20:09

Jamshaid K. · Answer 1 · 2016-02-16T21:38:37.987

Well, it seems like you want to play some sound on key pressing in console application, This is how you are gonna Do that!

public static void PressAnyKey()
{
    Console.WriteLine("Stroke Keys!");
    do
    {
        var mykey = Console.ReadKey(true); //Read The Key

        switch (mykey.Key)
        {
            case ConsoleKey.UpArrow:
                Console.WriteLine("UpArrow Pressed");
                //do your stuff
                break;
            case ConsoleKey.DownArrow:
                Console.WriteLine("DownArrow Pressed");
                //do your stuff
                break;
            case ConsoleKey.RightArrow:
                Console.WriteLine("RightArrow Pressed");
                //do your stuff
                break;
            case ConsoleKey.LeftArrow:
                Console.WriteLine("LeftArrow Pressed");
                //do your stuff
                break;
        }
    } while (true);
}

and if you want to emit some sound from system speaker you can use Console.Beep(Frequency,Duration) Method and int Frequency & int Duration variables to adjust it's Frequency and Duration!
this is how the Function will be after adding few lines!

public static void BeepOnKey()
{
    int frequency = 10000;
    int duration = 100;

    Console.WriteLine("Use keyboard arrows to adjust frequency and duration");
    do
    {
        while (!Console.KeyAvailable)
        {
            Console.Beep(frequency, duration);
            //this method emits beep sound from system speakers
        }

        var mykey = Console.ReadKey(true); //Read The Key

        switch (mykey.Key)
        {
            case ConsoleKey.UpArrow:
                Console.WriteLine("UpArrow Pressed");
                frequency += 100;
                frequency = Math.Min(frequency, 15000);
                //do your stuff
                break;
            case ConsoleKey.DownArrow:
                Console.WriteLine("DownArrow Pressed");
                frequency -= 100;
                frequency = Math.Max(frequency, 1000);
                //do your stuff
                break;
            case ConsoleKey.RightArrow:
                Console.WriteLine("RightArrow Pressed");
                duration += 100;
                duration = Math.Min(duration, 1000);
                //do your stuff
                break;
            case ConsoleKey.LeftArrow:
                Console.WriteLine("LeftArrow Pressed");
                duration -= 100;
                duration = Math.Max(duration, 100);
                //do your stuff
                break;
        }
    } while (true);
}

How to check if a key is being pressed in c# (console app)

1 Answers1