I am trying to detect hotkeys of ALT+1 through ALT+9 but when ALT is pressed the key comes in as Key.System. When CTRL+NumPad0 is pressed it key is Key.NumPad0 which is correct.
private void MainWindow_PreviewKeyDown(object sender, KeyEventArgs e)
{
bool isAlt = Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt);
bool isCtrl = Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl);
string ctrlMod = string.Empty;
if (isAlt)
{
ctrlMod = "alt + " + e.Key.ToString();
}
if (isCtrl)
{
ctrlMod = "ctrl + " + e.Key.ToString();
}
Debug.WriteLine("Key is " + ctrlMod);
}
ALT+NumPad0 through ALT+NumPad9 produces:
Key is alt + System
Ctrl works properly
Key is ctrl + NumPad1
Key is ctrl + NumPad2
Key is ctrl + NumPad3
You could use the Keyboard.Modifiers
and KeyEventArgs.SystemKey
properties to detect ALT+1
through ALT+9
:
private void MainWindow_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (Keyboard.Modifiers == ModifierKeys.Alt)
{
string ctrlMod = "alt + " + e.SystemKey.ToString();
Debug.WriteLine("Key is " + ctrlMod);
}
}
private void MainWindow_PreviewKeyDown(object sender, KeyEventArgs e)
{
bool isAlt = Keyboard.Modifiers == ModifierKeys.Alt;
bool isCtrl = Keyboard.Modifiers == ModifierKeys.Control;
string ctrlMod = string.Empty;
if (isAlt)
{
ctrlMod = "alt + " + e.SystemKey.ToString();
}
if (isCtrl)
{
ctrlMod = "ctrl + " + e.Key.ToString();
}
Debug.WriteLine("Key is " + ctrlMod);
}
I think maccettura is right and its to do with 'Windows Alt Codes'. I can get around it using
if (Keyboard.IsKeyDown(Key.NumPad0)) { }
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