Powershell: WPF action on second button click - wpf

Question

I am building a little UI that will reboot a Windows machine. I would like to have the restart button prompt the user for confirmation, then perform the reboot when the second click happens. I am thinking I'll use a counter to achieve this goal, but it doesn't look like the button is updating the value of $counter. Is this the best way to achieve this?
Function Start-guitest {
[CmdletBinding()]
[xml]$inputXML = #"
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp2"
Title="Configuration Script" Height="187.481" Width="400">
<Grid>
<GroupBox x:Name="Actions" Header="Actions" HorizontalAlignment="Left" Height="108" VerticalAlignment="Top" Width="170" Margin="7,11,0,0">
<StackPanel>
<Button x:Name="eventLog_btn" Content="Show errors and warnings"/>
<Label />
<Button x:Name="restart_btn" Content="Restart Windows"/>
</StackPanel>
</GroupBox>
<GroupBox x:Name="Output" Header="Output" HorizontalAlignment="Left" Margin="183,11,0,0" Width="200" Height="108" VerticalAlignment="Top">
<TextBox x:Name="output_txtbx" IsReadOnly="True" HorizontalScrollBarVisibility="Auto" TextWrapping="Wrap" VerticalScrollBarVisibility="Auto" />
</GroupBox>
</Grid>
</Window>
"#
Set-Variable -Name $inputXML -Value ($inputXML.Window -replace 'mc:Ignorable="d"','' -replace "x:N",'N' -replace '^<Win.*', '<Window') -Force -ErrorAction SilentlyContinue
[void][System.Reflection.Assembly]::LoadWithPartialName('PresentationFramework')
[xml]$xaml = $inputXML
# Read XAML.
$reader = (New-Object System.Xml.XmlNodeReader $xaml)
Try {
$form = [Windows.Markup.XamlReader]::Load($reader)
}
Catch {
#error message
}
# Connect to controls.
$xaml.SelectNodes("//*[#*[contains(translate(name(.),'n','N'),'Name')]]") | ForEach {
New-Variable -Name "WPF$($_.Name)" -Value $form.FindName($_.Name) -Force
}
$counter = 0
$WPFeventLog_btn.Add_Click({
Try {
Get-EventLog -LogName Application -After $startTime.AddSeconds(-3) -EntryType Warning,Error -Source $EventLogSource | Out-GridView -Title "Deployment errors.";
$WPFoutput_txtbx.Text = "Please remediate deployment errors, then re-run the config script."
}
Catch {
$WPFoutput_txtbx.Text = "There are no configuration errors or warnings."
}
})
$WPFrestart_btn.Add_Click({
Try {
if ($counter -eq 0) {
$WPFoutput_txtbx.Text = "Are you sure the server is fully configured? Counter is: $counter"
$counter++
} elseif ($counter -gt 0) {
$WPFoutput_txtbx.Text = "Okay, rebooting. Counter is: $counter"
}
}
Catch {
Write-Warning $_
}
})
$form.ShowDialog() | Out-Null
}

Answer 1

You are running into scope issues. Change all references of $counter to $global:counter and your issue will be resolved.