Powershell - 一段时间后关闭表单

我有一个 power-shell 表单提示用户是否想要推迟关闭时间（关闭时间由另一个 ps 脚本作为参数给出，该参数在初始脚本中计算）。

我想在 30 分钟不活动后关闭表单，我该怎么做？

Powershell代码（表格）：

#creating the form object

$form = New-Object System.Windows.Forms.Form 


#setting the from title
$form.Text = "System warning"

#setting the form dimesnions and positions 
$form.Size = New-Object System.Drawing.Size(300,250) 
$form.StartPosition = "CenterScreen"


#claculate time before shut down:
$StartDate=(GET-DATE)
#this ill have to be replaced by a parameter which indicates the shut down date
$EndDate = $EndDate | Get-Date 
$timeDifference = NEW-TIMESPAN –Start $StartDate –End $EndDate
$secondsTilShutdown = $timeDifference.TotalSeconds


#time remaining message
$label = New-Object System.Windows.Forms.Label
$label.Location = New-Object System.Drawing.Point(10,20) 
$label.Size = New-Object System.Drawing.Size(280,40)  
$label.Text = "This computer is scheduled to shutdown at " + $EndDate 
$form.Controls.Add($label) 


#second message 
$label = New-Object System.Windows.Forms.Label
$label.Location = New-Object System.Drawing.Point(10,70) 
$label.Size = New-Object System.Drawing.Size(280,20)  
$label.Text = "Postpone the shutdown by : " 
$form.Controls.Add($label) 


#setting up the drop down box (time in minutes)
$TimePeriods = 60, 120, 180, 240  

$DropDown = new-object System.Windows.Forms.ComboBox
$DropDown.Location = new-object System.Drawing.Size(10,90)
$DropDown.Size = new-object System.Drawing.Size(130,30)

    ForEach ($time in $TimePeriods) {
      [void] $DropDown.Items.Add([string]($time/60) + " hours")
    }
#1 hour is the default  
$DropDown.SelectedItem = $DropDown.Items[0]    
$Form.Controls.Add($DropDown)



#creating the postpone button  
$OKButton = New-Object System.Windows.Forms.Button
#position of the button on the form
$OKButton.Location = New-Object System.Drawing.Point(25,130)
#size of the button
$OKButton.Size = New-Object System.Drawing.Size(100,50)
#text of the button
$OKButton.Text = "Postpone"
#the value that the from dialog will return if we click on ok
$OKButton.DialogResult = [System.Windows.Forms.DialogResult]::OK
#assigns a key down on the enter key to the button
$form.AcceptButton = $OKButton
#adds the button to the form
$form.Controls.Add($OKButton)

#creating the ignore button
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Point(175,130)
$CancelButton.Size = New-Object System.Drawing.Size(100,50)
$CancelButton.Text = "Continue with scheduled shutdown"
$CancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$form.CancelButton = $CancelButton
$form.Controls.Add($CancelButton)


$textBox = New-Object System.Windows.Forms.TextBox 
$textBox.Location = New-Object System.Drawing.Point(10,40) 
$textBox.Size = New-Object System.Drawing.Size(260,20) 
$form.Controls.Add($textBox) 

$form.Topmost = $True

$form.Add_Shown({$textBox.Select()})
$result = $form.ShowDialog()


###processing form results : 


#if the postpone button button was selected 
if ($result -eq [System.Windows.Forms.DialogResult]::OK)
{
    #logic
}

elseif($result -eq [System.Windows.Forms.DialogResult]::Cancel)
{
   #we do not push back the shut down time 
}

使用计时器，我给你一个关闭形式的计时器的例子

 Function ClearAndClose()
 {
    $Timer.Stop(); 
    $Form.Close(); 
    $Form.Dispose();
    $Timer.Dispose();
    $Script:CountDown=5
 }

 Function Button_Click()
 {
    ClearAndClose
 }

 Function Timer_Tick()
 {

    $Label.Text = "Your system will reboot in $Script:CountDown seconds"
         --$Script:CountDown
         if ($Script:CountDown -lt 0)
         {
            ClearAndClose
         }
 }



 Add-Type -AssemblyName System.Windows.Forms
 Add-Type -AssemblyName System.Drawing
 $Form = New-Object system.Windows.Forms.Form
 $Form.Text = "Attention redémarrage!!"
 $Form.Size = New-Object System.Drawing.Size(250,100)
 $Form.StartPosition = "CenterScreen"
 $Form.Topmost = $True


 $Label = New-Object System.Windows.Forms.Label
 $Label.AutoSize = $true
 $Label.Location = New-Object System.Drawing.Size(20,5)


 $Button = New-Object System.Windows.Forms.Button
 $Button.Location = New-Object System.Drawing.Size(55,35)
 $Button.Size = New-Object System.Drawing.Size(120,23)
 $Button.Text = "STOP"
 $Button.DialogResult=[System.Windows.Forms.DialogResult]::OK

 $Timer = New-Object System.Windows.Forms.Timer
 $Timer.Interval = 1000

 $Form.Controls.Add($Label)
 $Form.Controls.Add($Button)

 $Script:CountDown = 6

 $Button.Add_Click({Button_Click})
 $Timer.Add_Tick({ Timer_Tick})


 $Timer.Start()
 $Form.ShowDialog()