keydown in c# doesn't work for some reason

Question

I\'m trying to do a calculator and all I have to do is make it work with the keyboard. This should work but it doesn\'t.

    private void Form1_KeyDown(objec         


        

Answer 1

Assuming you have a WinForms project, set the KeyPreview property of your form to true, like that (e.g. in the constructor) :

public Form1()
{
    InitializeComponent();
    KeyPreview = true;
}

and it should work like you expected.

Edit: Due to your comment I've added the code to catch all the signs (add that to your Form1_KeyDown method)

if (((e.KeyCode == Keys.D7) && (e.Modifiers == Keys.Shift)) || (e.KeyCode == Keys.Divide))
{
    sign("/");
}
else if (((e.KeyCode == Keys.Oemplus) && (e.Modifiers == Keys.Shift)) || (e.KeyCode == Keys.Multiply))
{
    sign("*");
}
else if ((e.KeyCode == Keys.OemMinus) || (e.KeyCode == Keys.Subtract))
{
    sign("-");
} 
else if ((e.KeyCode == Keys.Oemplus) || (e.KeyCode == Keys.Add))
{
    sign("+");
} 
else if (e.KeyCode == Keys.Enter)
{
    sign("=");
}