Powershell計時器 - 更新gui

Question

我創建了一個powershell計時器，每1秒后，我想運行一個函數來執行或將文本發布到界面上的文本框日志。

運行以下。 單擊“開始”時，每隔1秒，日志文本區域應顯示“每1秒發布一次，而不是批處理”。 但是，當您單擊“停止”時，此消息僅一次性顯示為批處理。

這個問題似乎沒有在互聯網上得到解答！

碼：

$global:timer = New-Object System.Timers.Timer
$global:timer.Interval = 1000


function AddToLog($logtext)
{
    $txtLog.Text = $txtLog.Text + "`r`n" + $logtext
    $txtLog.ScrolltoCaret
}

function startTimer() { 
    Register-ObjectEvent -InputObject $global:timer -EventName Elapsed -SourceIdentifier theTimer -Action {AddToLog('Post to log every 1 second, not as a batch') }
    $global:timer.start()
    Write-Host "Start Timer"
}

function stopTimer() {
    $global:timer.stop()
    Write-Host "Close Function"
    Unregister-Event theTimer
}


########################
# Setup User Interface
########################

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

$objForm = New-Object System.Windows.Forms.Form 
$objForm.Text = "Timer Example"
$objForm.Size = New-Object System.Drawing.Size(330,380) 
$objForm.StartPosition = "CenterScreen"


#Start Button
$btnStart = New-Object System.Windows.Forms.Button
$btnStart.Location = New-Object System.Drawing.Size(10,190)
$btnStart.Size = New-Object System.Drawing.Size(140,35)
$btnStart.Text = "Start"

$btnStart.Add_Click({StartTimer; })
$objForm.Controls.Add($btnStart)

#Stop Button
$btnStop = New-Object System.Windows.Forms.Button
$btnStop.Location = New-Object System.Drawing.Size(150,190)
$btnStop.Size = New-Object System.Drawing.Size(140,35)
$btnStop.Text = "Stop"
$btnStop.Add_Click({StopTimer; })
$objForm.Controls.Add($btnStop)
$btnStop.Enabled  = $true

#Log Area
$lblLog = New-Object System.Windows.Forms.Label
$lblLog.Location = New-Object System.Drawing.Size(10,230) 
$lblLog.Size = New-Object System.Drawing.Size(80,20) 
$lblLog.Text = "Event Log:"
$objForm.Controls.Add($lblLog) 

$txtLog = New-Object System.Windows.Forms.Textbox
$txtLog.Location = New-Object System.Drawing.Size(10,250)
$txtLog.Size = New-Object System.Drawing.Size(290,90)
$txtLog.Multiline = $True
$txtLog.Scrollbars = "vertical"

$txtLog.Add_Click({$txtLog.SelectAll(); $txtLog.Copy()})
$objForm.Controls.Add($txtLog)

$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()

感謝您的高級幫助。

-R

Answer 1

嘗試使用System.Windows.Forms.Timer 。 有關.NET計時器之間差異的信息，請參閱此文章 。

對於WinForms計時器，拋棄Register-ObjectEvent和Unregister-Event並在調用ShowDialog（）之前添加此行：

$timer.add_Tick({AddToLog('Post to log every 1 second, not as a batch')})

不要忘記更改為System.Windows.Forms.Timer。 當我進行這些更改時，UI會起作用。

使用Register-ObjectEvent要求PowerShell在其執行的各個安全點為事件隊列提供服務。 但是，由於PowerShell在某些.NET代碼（Form.ShowDialog（））中被阻止，因此它無法為其事件隊列提供服務。

Answer 2

我拿走了你所擁有的東西，看了看這個egg_timer項目並提出了以下建議：

  $timer = New-Object System.Windows.Forms.Timer
  $timer.Interval = 1000
  $timer.add_tick({AddToLog 'Post to log every 1 second, not as a batch'})



function AddToLog($logtext)
{
    $txtLog.Text = $txtLog.Text + "`r`n" + $logtext
    $txtLog.ScrolltoCaret
}

function startTimer() { 

   $timer.start()

}

function stopTimer() {

    $timer.Enabled = $false
    Write-Host "Close Function"

}


########################
# Setup User Interface
########################

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

$objForm = New-Object System.Windows.Forms.Form 
$objForm.Text = "Timer Example"
$objForm.Size = New-Object System.Drawing.Size(330,380) 
$objForm.StartPosition = "CenterScreen"


#Start Button
$btnStart = New-Object System.Windows.Forms.Button
$btnStart.Location = New-Object System.Drawing.Size(10,190)
$btnStart.Size = New-Object System.Drawing.Size(140,35)
$btnStart.Text = "Start"

$btnStart.Add_Click({StartTimer; })
$objForm.Controls.Add($btnStart)

#Stop Button
$btnStop = New-Object System.Windows.Forms.Button
$btnStop.Location = New-Object System.Drawing.Size(150,190)
$btnStop.Size = New-Object System.Drawing.Size(140,35)
$btnStop.Text = "Stop"
$btnStop.Add_Click({StopTimer; })
$objForm.Controls.Add($btnStop)
$btnStop.Enabled  = $true

#Log Area
$lblLog = New-Object System.Windows.Forms.Label
$lblLog.Location = New-Object System.Drawing.Size(10,230) 
$lblLog.Size = New-Object System.Drawing.Size(80,20) 
$lblLog.Text = "Event Log:"
$objForm.Controls.Add($lblLog) 

$txtLog = New-Object System.Windows.Forms.Textbox
$txtLog.Location = New-Object System.Drawing.Size(10,250)
$txtLog.Size = New-Object System.Drawing.Size(290,90)
$txtLog.Multiline = $True
$txtLog.Scrollbars = "vertical"

$txtLog.Add_Click({$txtLog.SelectAll(); $txtLog.Copy()})
$objForm.Controls.Add($txtLog)


$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()