Can anyone point me in the right direction for some documentation about handling WPF UI events in Powershell?
I want to know how to, for example, call a function when a CheckBox or Radio Button is changed.
Cheers!
Ben
3 Answers
Late to the party (by over 4 years). Specifically addressing jpierson's comment.
But in case anyone finds this post, as I did, via Googling PowerShell WPF event handling, wanting to obtain the Sender control (sender) & Event Args (e), here's how...
C# version (non-specific template)
private void Handler(object sender, SomeEventArgs e)
{
//do something with sender and/or e...
}
PowerShell version
$WPFControl.Add_Handler({
$sender = $args[0]
$e = $args[1]
#do something with sender and/or e...
})
And onto a specific MouseWheelHandler event handler
C# version (where the MouseWheelHandler event has been bound to a control)
private void ScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
ScrollViewer scv = (ScrollViewer)sender;
//do something with sender and/or e...
}
PowerShell version
$ScrollViewer.Add_PreviewMouseWheel({
$sender = [System.Windows.Controls.ScrollViewer]$args[0]
$e = [System.Windows.Input.MouseWheelEventArgs]$args[1]
#do something with sender and/or e...
})
In PowerShell, to get the types of sender and event args, use the following
$ScrollViewer.Add_PreviewMouseWheel({
Write-Host $args[0]
Write-Host $args[1]
})
which (in the above example) will give you...
System.Windows.Controls.ScrollViewer
System.Windows.Input.MouseWheelEventArgs
1 Comment
Sergey Sypalo
I've serached for a 3 weeks on SO and Microsoft forums, and no one is able to give me an answer on simple quesion, how to work with events in PowerShell, and as I assumed it's really easy. Thx a lot, you never late to the party ;)
Considering WPF and PowerShell, have a look at WPF Linkcollection for PowerShell from Bernd. You will find many interesting links that will help you.
Considering your problem, just use pattern
$control.Add_<someevent>({ what to do })
For example, someevent could be Click for a Button:
$button.Add_Click({ $global:clicked = $true })
You pass in a scriptblock that handles the event.
1 Comment
jpierson
How do you get at the event args and/or sender arguments.
ok, it's a long shot because this post is from 2015, but i tried and it's not working for me. It doesn't rise an error but i don't have access to sender properties
Get-Variable -Name Ctrl_* -ValueOnly | Where-Object {$_.Name -match '^btn_[^_]+_Nav_(Previous|Next)$'} | ForEach-Object {
$_.Add_Click({
$sender = [System.Windows.Controls.Button]$args[0]
$sender.Name
})
}
I try to make a generic navigation system for an hmi
Best Regards, Richard
