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How do I suppress my event-handling function from emitting unwanted text?

I have a PowerShell script that composes a WinForms UI. Here are the pertinent bits:

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

Function FormClosed()
{
$global:Canceled = $true
}

$global:MainForm = New-Object 'System.Windows.Forms.Form'
$global:MainForm.add_FormClosed({FormClosed})

$global:MainForm.ShowDialog()


When I run the program, I get a PowerShell console window and the UI (as expected). When I click the main form control box "X", the function FormClosed is invoked (as expected). However, the text Cancel unexpectedly appears in the console window.

FormClosed

Cancel

I put a breakpoint on $global:Canceled = $true in the function FormClosed. At this breakpoint, I step and then I see the execution pointer is on the } in $global:MainForm.add_FormClosed({FormClosed}). I step one more time and the text Cancel appears in the console window. So, I assume that the .NET FormClosed event is firing my FormClosed function (as expected) and my FormClosed function is emitting the text Cancel. I assume the text Cancel originated from the .NET FormClosed event.

$global:Canceled = $true

FormClosed

}

$global:MainForm.add_FormClosed({FormClosed})

Cancel

FormClosed

FormClosed

FormClosed

Cancel

Cancel

FormClosed

How do I suppress my FormClosed function from emitting the text Cancel?

FormClosed

Cancel

1 Answer
1

Cancel is return value from ShowDialog method. You can send it to Null output:

Cancel

ShowDialog

$global:MainForm.ShowDialog() | Out-Null


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