Set a hotkey press event for the form - powershell

Question

Use the following code to set hotkey press event for the form, but when the hotkey is pressed, the system has an alarm sound, why?
In addition, how to set multiple modifier keys, For example ctrl+alt+shift+Q
$form1_KeyDown = [System.Windows.Forms.KeyEventHandler]{
#Event Argument: $_ = [System.Windows.Forms.KeyEventArgs]
if ($_.Alt -and $_.KeyCode -eq 'Q')
{
Write-Host 'Alt-Q pressed'
}
}

Answer 1

I would not know why you get a system beep when pressing a hotkey, but it may have to do with the way you add the KeyEventHandler to the form.
Using $form1.Add_KeyDown({..}) gives me no problem whatsoever:
$form1.Add_KeyDown({
# create a small array to capture the modifier keys used
$modifiers = #()
if ($_.Shift) { $modifiers += "Shift" }
if ($_.Alt) { $modifiers += "Alt" }
if ($_.Control) { $modifiers += "Control" }
# using that array, build part of the output text
$modkeys = ''
if ($modifiers.Count) {
$modkeys = '{0} ' -f ($modifiers -join ' + ')
}
# instead of building up a string 'Shift + Control + Alt', like above, you can also use
# the $_.Modifiers property and replace the commas by a plus sign like this:
# $modkeys = $_.Modifiers -replace ', ', ' + '
# these are the keys you want to react upon as example
# here all keys pressed simply do the same thing, namely display what was pressed,
# so we can shorten the code to simply test if any of the keys in the
# array correspond with the key the user pressed.
if ('Q','A','F1','Escape','NumLock' -contains $_.KeyCode) {
# we create the output string by making use of the '-f' Format operator in POwershell.
# you can read more about that here for instance:
# https://social.technet.microsoft.com/wiki/contents/articles/7855.powershell-using-the-f-format-operator.aspx
Write-Host ('{0}{1} pressed' -f $modkeys, $_.KeyCode)
# The same could have been done with something like:
# Write-Host ($modkeys + ' ' + $_.KeyCode + ' pressed')
# or
# Write-Host "$modkeys $($_.KeyCode) pressed"
}
})