Programmatically trigger an event on a WinForms object in Powershell

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Programmatically trigger an event on a WinForms object in Powershell

schleep

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Points: 12585
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June 19, 2018 at 11:55 am

#352022

Hi all,
Let's say I've got a label ($ObjLabel) and a checkbox ($ObjCheckBox), that is created not checked, and added to my form.
I've got code in the CheckedChanged event that changes the text in the label.
How can I programmatically run the CheckedChanged event?
Thanks!
P

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Phil Parkin SSC Guru Points: 246992 More actions · Answer 1

schleep - Tuesday, June 19, 2018 11:55 AM
Hi all,
Let's say I've got a label ($ObjLabel) and a checkbox ($ObjCheckBox), that is created not checked, and added to my form.
I've got code in the CheckedChanged event that changes the text in the label.
How can I programmatically run the CheckedChanged event?
Thanks!
P

Just checking - you want your external PoSh process to somehow 'reach into' your WinForms app and fire an event, is that right? I don't think you can do that, though I'm not saying it's impossible.

Instead, you'd need to code your WinForms app to react to something that the PoSh process does.

The absence of evidence is not evidence of absence.
Martin Rees

You can lead a horse to water, but a pencil must be lead.
Stan Laurel

schleep SSChampion Points: 12585 More actions · Answer 2

I guess I didn't explain myself very well.

This is all in a single powershell script. In pseudocode:

1. create label $objLabel1 with text "Black"
2. create checkbox $ObjCB1, with Checked = $false
3. $ObjCB1.Add_CheckChanged( {if $objCB1.Checked {$ObjLabel1.Text = "White"} else {$ObjLabel1.Text = "Black"}})

Now I want to see trigger this event, which should change the label's text property.

4. programmatically trigger the CheckChanged event on $ObjCB1

Then run this code.

Does this make more sense?

ZZartin SSC-Dedicated Points: 30921 More actions · Answer 3

schleep - Tuesday, June 19, 2018 12:31 PM
I guess I didn't explain myself very well.
This is all in a single powershell script. In pseudocode:
1. create label $objLabel1 with text "Black"
2. create checkbox $ObjCB1, with Checked = $false
3. $ObjCB1.Add_CheckChanged( {if $objCB1.Checked {$ObjLabel1.Text = "White"} else {$ObjLabel1.Text = "Black"}})
Now I want to see trigger this event, which should change the label's text property.
4. programmatically trigger the CheckChanged event on $ObjCB1
Then run this code.
Does this make more sense?

I was able to do something like this if this is what you're looking for,

$check_box_clicked=
{
If($checkBox3.Checked)
{
$textBox.Text = "Clicked"
}
Else
{
$textBox.Text = "Not Clicked"
}
}

$checkBox3.add_Click($check_box_clicked)

Phil Parkin SSC Guru Points: 246992 More actions · Answer 4

schleep - Tuesday, June 19, 2018 12:31 PM
I guess I didn't explain myself very well.
This is all in a single powershell script. In pseudocode:
1. create label $objLabel1 with text "Black"
2. create checkbox $ObjCB1, with Checked = $false
3. $ObjCB1.Add_CheckChanged( {if $objCB1.Checked {$ObjLabel1.Text = "White"} else {$ObjLabel1.Text = "Black"}})
Now I want to see trigger this event, which should change the label's text property.
4. programmatically trigger the CheckChanged event on $ObjCB1
Then run this code.
Does this make more sense?

Ah, right, that makes more sense. I've never built a WinForms PoSh script, so I am out of my depth here.
Presumably you've tried just running
$ObjCB1.Add_CheckChanged()
?

The absence of evidence is not evidence of absence.
Martin Rees

You can lead a horse to water, but a pencil must be lead.
Stan Laurel

schleep SSChampion Points: 12585 More actions · Answer 5

I had not tried that, but it gives an error
Cannot find an overload for "add_CheckedChanged" and the argument count: "0".

All the examples I can find are in C#, and it appears to be possible that way, I just can't find an example, nor the corresponding syntax, in PoSh

Phil Parkin SSC Guru Points: 246992 More actions · Answer 6

schleep - Wednesday, June 20, 2018 4:36 AM
I had not tried that, but it gives an error
Cannot find an overload for "add_CheckedChanged" and the argument count: "0".
All the examples I can find are in C#, and it appears to be possible that way, I just can't find an example, nor the corresponding syntax, in PoSh

Looks like it found add_CheckedChanged(), but expected > 0 arguments. Which, in C#, would make me think that it should be declared as a 'void'. But PoSh is a different animal & I won't waste your time by continuing to guess!

The absence of evidence is not evidence of absence.
Martin Rees

You can lead a horse to water, but a pencil must be lead.
Stan Laurel

ZZartin SSC-Dedicated Points: 30921 More actions · Answer 7

schleep - Wednesday, June 20, 2018 4:36 AM
I had not tried that, but it gives an error
Cannot find an overload for "add_CheckedChanged" and the argument count: "0".
All the examples I can find are in C#, and it appears to be possible that way, I just can't find an example, nor the corresponding syntax, in PoSh

Does the example I posted for you not work?

schleep SSChampion Points: 12585 More actions · Answer 8

Hi ZZartin,
Thanks for taking the time to respond - and check back.

That's what I had already. What I'm trying to do it to fire the Clicked/Checked event in code.

Phil Parkin SSC Guru Points: 246992 More actions · Answer 9

ZZartin - Wednesday, June 20, 2018 7:48 AM
schleep - Wednesday, June 20, 2018 4:36 AM
I had not tried that, but it gives an error
Cannot find an overload for "add_CheckedChanged" and the argument count: "0".
All the examples I can find are in C#, and it appears to be possible that way, I just can't find an example, nor the corresponding syntax, in PoSh
Does the example I posted for you not work?

Once the handler has been declared (which you have shown), how do you (using code) run it?

The absence of evidence is not evidence of absence.
Martin Rees

You can lead a horse to water, but a pencil must be lead.
Stan Laurel

ZZartin SSC-Dedicated Points: 30921 More actions · Answer 10

schleep - Wednesday, June 20, 2018 8:01 AM
Hi ZZartin,
Thanks for taking the time to respond - and check back.
That's what I had already. What I'm trying to do it to fire the Clicked/Checked event in code.

Ah... so you're trying to call the on click command from somewhere else, can you just use something like Invoke-Expression "$check_box_clicked"

Something like this,

$testy_button = New-Object System.Windows.Forms.Button
$testy_button.Location = New-Object System.Drawing.Point(150,150)
$testy_button.Size = New-Object System.Drawing.Size(75,23)
$testy_button.Text = 'Testy'
$testy_button.Add_Click(
{
Invoke-Command -ScriptBlock $check_box_clicked
}
)
$form.Controls.Add($testy_button)

schleep SSChampion Points: 12585 More actions · Answer 11

From your example above,
$check_box_clicked= {
If($checkBox3.Checked)
{
$textBox.Text = "Clicked"
}
Else
{
$textBox.Text = "Not Clicked"
}
}
$checkBox3.add_Click($check_box_clicked)

In the next line of code, I want to "Click" $checkBox3

ZZartin SSC-Dedicated Points: 30921 More actions · Answer 12

schleep - Wednesday, June 20, 2018 8:32 AM
From your example above,
$check_box_clicked= {
If($checkBox3.Checked)
{
$textBox.Text = "Clicked"
}
Else
{
$textBox.Text = "Not Clicked"
}
}
$checkBox3.add_Click($check_box_clicked)
In the next line of code, I want to "Click" $checkBox3

Yep like I said, Invoke-Command -ScriptBlock $check_box_clicked

Another option would be to put that code into a function and just call that function in the check box on button as well as wherever else you want.

schleep SSChampion Points: 12585 More actions · Answer 13

schleep

SSChampion

Points: 12585

June 20, 2018 at 8:54 am

#1994656

Thank you Sir!!!