Not getting spacebar input

Question

I want a variable to be incremented when I press the spacebar. This is what I have tried so far, and it doesn't seem to be working. There's no error message, so I don't know what is wrong.

    public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
    int Coins = 0;
    int ButtonKeyNumber = (int)Key.Space;

    private void textBlockCoins_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyValue == ButtonKeyNumber)
        {
            Coins = Coins + 1;
            textBlockCoins.Text = "You Have " + Coins + "Coins";
        }
    }
}

When I run the code, the textbox just says "You Have 0 Coins". The variable ButtonKeyNumber is there because I want to be able to easily change which key will need to be pressed.

Why do you need the variable at all? Compare directly to `Key.Space`, and then use the debugger to figure out what key you're getting in `e.KeyValue`. — Ken White, Aug 19 '16 at 01:45
Is your KeyDown event callback actually being called? Make sure that the correct control has focus (first, click on textBlockCoins) to receive the KeyDown event. Put a breakpoint on the `if` and see what the value of e.KeyValue actually is! — khargoosh, Aug 19 '16 at 01:46

khargoosh · Answer 1 · 2016-08-19T01:55:04.363

You might be using the wrong Keys class. Use the System.Windows.Forms.Keys class, this is the type that is provided by KeyEventArgs.KeyCode. Try something like this instead.

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
    int Coins = 0;
    Keys CoinKey = System.Windows.Forms.Keys.Space;

    private void textBlockCoins_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
    {
        if (e.KeyCode == CoinKey)
        {
            Coins = Coins + 1;
            textBlockCoins.Text = "You Have " + Coins + "Coins";
        }
    }
}

You still have to make sure the right control has focus when hitting the space key.

score 0 · Answer 2 · edited May 23 '17 at 10:28

0

Set KeyPreview to true on your form and you will catch them: MSDN

Original

edited May 23 '17 at 10:28

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answered Aug 19 '16 at 14:26

Ryan Peters

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Not getting spacebar input

2 Answers2