PowerShell limit entries in text boxes to integer values only [duplicate] - powershell

Question

I have a small program which accepts an integer and converts it to DateTime. However, I try to use KeyCode to only allow numbers from both keyboard and numpad, and eliminate the special characters and letters. My code is allowing Shift+Num to enter those special characters. How do eliminate them from being entered?
$FromDateText.Add_KeyDown({KeyDown})
$ToDateText.Add_KeyDown({KeyDown}) #TextBox
Function KeyDown()
{
if ($FromDateText.Focused -eq $true -or $ToDateText.Focused -eq $true)
{
if ($_.KeyCode -gt 47 -And $_.KeyCode -lt 58 -or $_.KeyCode -gt 95 -and
$_.KeyCode -lt 106 -or $_.KeyCode -eq 8)
{
$_.SuppressKeyPress = $false
}
else
{
$_.SuppressKeyPress = $true
}
}
}

Answer 1

Instead of intercepting the KeyDown event, I'd simply just remove any non-digit character from the TextBox every time the TextChanged event is raised:
$ToDateText.add_TextChanged({
# Check if Text contains any non-Digits
if($tbox.Text -match '\D'){
# If so, remove them
$tbox.Text = $tbox.Text -replace '\D'
# If Text still has a value, move the cursor to the end of the number
if($tbox.Text.Length -gt 0){
$tbox.Focus()
$tbox.SelectionStart = $tbox.Text.Length
}
}
})
Way easier than trying to infer the input value from Key event args