cls
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") 

$job1 = {
    param($btn,$counter)
    $counter..0 | foreach {
        $btn.Text = $_
        Start-Sleep -Milliseconds 100
    }
}

$f = New-Object "System.Windows.Forms.Form"
$f.Width = 210
$f.Height = 200
$f.StartPosition = 'CenterScreen'

$b = New-Object 'System.Windows.Forms.Button'
$b.Location = New-Object 'System.Drawing.Point'(50,50)
$b.Width = 100
$b.Height = 50
$b.Text = 'Click'
$b.add_Click({
    [powershell]::Create().
        AddScript($job1).    #脚本
        AddArgument($this).  #参数1 btn
        AddArgument(200).    #参数2 counter
        BeginInvoke()
})
$f.Controls.Add($b)

$f.ShowDialog()
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