Mouse event don't work after first timer Tick

问题

I'm using powershell to develop a little tool with graphic interface and I'm going crazy with this issue...

For example: I have a label on a form that display "real-time" status of a ping. In the same time, if you click on the label, a popup message is displayed.

    function GoogleStatus ($Label)
    {
            $Google = "www.google.com"

            If (Test-Connection -ComputerName $Google -Count 1 -Quiet)
                    {Label.Text = "Yes"}
            else
                    {Label.Text = "No"}
    }

    function HelloMsg
    {
            [System.Windows.Forms.MessageBox]::Show("Hello","Funny Window",0,32)
    }


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

    #Forms
    $Form = New-Object System.Windows.Forms.Form
    $Form.Size = '150, 220' 

    $Label = New-Object System.Windows.Forms.Label  
    $Form.Controls.Add($Label)
    $Label.Location = '10, 30'
    $Label.Size = '75, 20'
    $Label.Add_Click({HelloMsg})

    #Timer Init
    $Timer = New-Object 'System.Windows.Forms.Timer'
    $Timer.Interval = 3000
    Timer.Add_Tick({GoogleStatus $Label})
    $Timer.Enabled = $True

    #Show Interface
    $Form.ShowDialog() 

During the first 3 secondes of the timer, clicking on the label display correctly the popup message. But if I wait more than 3 seconds, clicking on the label has no effect.

Help please :(

回答1:

I have removed 3 typos in the code, and it seems to work (I still get the popup after 3 seconds have elapsed) :

function GoogleStatus ($Label) {
    $Google = "www.google.com"

    if(Test-Connection -ComputerName $Google -Count 1 -Quiet) {
        $Label.Text = "Yes" # missing $ sign here
    } else {
        $Label.Text = "No" # missing $ sign here
    }
}

function HelloMsg {
    [System.Windows.Forms.MessageBox]::Show("Hello","Funny Window",0,32)
}

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

#Forms
$Form = New-Object System.Windows.Forms.Form
$Form.Size = '150, 220' 

$Label = New-Object System.Windows.Forms.Label  
$Form.Controls.Add($Label)
$Label.Location = '10, 30'
$Label.Size = '75, 20'
$Label.Add_Click({HelloMsg})

#Timer Init
$Timer = New-Object 'System.Windows.Forms.Timer'
$Timer.Interval = 3000
$Timer.Add_Tick({ GoogleStatus $Label }) # missing $ sign here
$Timer.Enabled = $True

#Show Interface
$Form.ShowDialog() 

回答2:

The timeout value for test-connection has to be less than your timer interval. Thank you @Eric Walker https://stackoverflow.com/users/4270366/eric-walker

来源：https://stackoverflow.com/questions/33577527/mouse-event-dont-work-after-first-timer-tick