WPF PowerShell GUI Function Return values in wrong order when using xaml ?

Question

WPF PowerShell GUI Function Return values in wrong order when using xaml ?

Borut Puhar 66

I have create a function and I use WPF and GUI.
I call this function and I need return values from function…
To get correct return I need to caal las valuses (-1, -2,..)

In function im returning : return $Var_S1_Text, $BBB, $($var_TexB_2.Text);
$A return array return following values...
trying item Button_1
trying item TexB_1
trying item TexB_2
False
Alfa
2 <- $A[-2]
Some new text <- $A[-1]

Is this normal or I need to modify script… because I need only last three values ?
Sample text :
unction ClickMe {

    Param  
    (  
    [Parameter(Mandatory = $true)] $BBB  
    )  
  
$inputXML = @"  
<Window x:Name="Winodw1" x:Class="WindowApp0.Window3"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WindowApp0"  
        mc:Ignorable="d"  
        Title="My First Window" Height="450" Width="800">  
    <Grid>  
        <Button x:Name="Button_1" Content="Button" HorizontalAlignment="Left" Margin="19,329,0,0" VerticalAlignment="Top" Height="50" Width="124" Grid.Column="1"/>  
        <TextBlock x:Name="TexB_1" HorizontalAlignment="Left" Margin="19,144,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top" Width="114" Height="32" Grid.Column="1"/>  
        <TextBlock x:Name="TexB_2" HorizontalAlignment="Left" Margin="170,144,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="174" Height="26" Grid.Column="1" Text="Some text"/>  
  
    </Grid>  
</Window>  
  
"@   
  
$inputXML = $inputXML -replace 'mc:Ignorable="d"','' -replace "x:N",'N' -replace '^<Win.*', '<Window' -replace 'TextChanged="TextBox(.*)','/>"'  
[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')  
[xml]$XAML = $inputXML  
  
$reader=(New-Object System.Xml.XmlNodeReader $xaml)  
try{  
    $FormA=[Windows.Markup.XamlReader]::Load( $reader )  
}  
catch{  
    Write-Warning "Unable to parse XML, with error: $($Error[0])`n Ensure that there are NO SelectionChanged or TextChanged properties in your textboxes (PowerShell cannot process them)"  
    throw  
}  
  
$xaml.SelectNodes("//*[@Name]") | %{"trying item $($_.Name)";  
    try {Set-Variable -Name "var_$($_.Name)" -Value $FormA.FindName($_.Name) -ErrorAction Stop}  
    catch{throw}  
    }  
  
$var_TexB_2.Text = "Some new text"  
Write-host "VAR is = $Var_S1_Text and $BBB" -ForegroundColor Green   
    [string]$Var_S1_Text = "Alfa"  
    [string]$BBB = "2"  
    $Var_Button_1.IsCancel = $true  
  
    $Var_Button_1.Add_Click({  
      $FormA.Close()})  
    $FormA.ShowDialog()   
    return $Var_S1_Text, $BBB, $($var_TexB_2.Text);  
  
}  
  
$B = "1"  
$A = @()  
$A = ClickMe $B  
Write-Host "$($A[0]) and $($A[1]) " -ForegroundColor Cyan  
$A[-1]  
$A[-2]

MotoX80 37,156 Reputation points

2022-11-23T13:41:34.737+00:00

Please edit your question and post the script using the Code Sample tool, the 101010 icon. Otherwise, the forum site will interpret your code as text formatting characters. That is why some parts of the script have a line number and a gray background.
MotoX80 37,156 Reputation points

2022-11-23T23:18:03.287+00:00

I'm sorry but when I paste your code into ISE, it does not parse.

4 answers

Your answer

MotoX80 37,156 Reputation points

2022-11-23T13:41:34.737+00:00

Please edit your question and post the script using the Code Sample tool, the 101010 icon. Otherwise, the forum site will interpret your code as text formatting characters. That is why some parts of the script have a line number and a gray background.
MotoX80 37,156 Reputation points

2022-11-23T23:18:03.287+00:00

I'm sorry but when I paste your code into ISE, it does not parse.

Answer 1

On line #45 you reference variable $Var_S1_Text before it's defined on line #46. Is that what you intended?

On line #39 you put the value "trying item $($_.Name)" into the Success stream. I think you meant to use Write-Host "trying item $($_.Name)" which would only show the string on the console.

On line #52 you place the value of the button that was clicked into the Success stream instead of assigning it to a variable.

Try this:

function ClickMe {  
    Param  
    (  
        [Parameter(Mandatory = $true)] $BBB  
    )  
  
    $inputXML = @"  
<Window x:Name="Winodw1" x:Class="WindowApp0.Window3"  
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
    xmlns:local="clr-namespace:WindowApp0"  
    mc:Ignorable="d"  
    Title="My First Window" Height="450" Width="800">  
<Grid>  
    <Button x:Name="Button_1" Content="Button" HorizontalAlignment="Left" Margin="19,329,0,0" VerticalAlignment="Top" Height="50" Width="124" Grid.Column="1"/>  
    <TextBlock x:Name="TexB_1" HorizontalAlignment="Left" Margin="19,144,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top" Width="114" Height="32" Grid.Column="1"/>  
    <TextBlock x:Name="TexB_2" HorizontalAlignment="Left" Margin="170,144,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="174" Height="26" Grid.Column="1" Text="Some text"/>  
  
</Grid>  
</Window>  
  
"@   
  
    $inputXML = $inputXML -replace 'mc:Ignorable="d"', '' -replace "x:N", 'N' -replace '^<Win.*', '<Window' -replace 'TextChanged="TextBox(.*)', '/>"'  
    [void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')  
    [xml]$XAML = $inputXML  
  
    $reader = (New-Object System.Xml.XmlNodeReader $xaml)  
    try {  
        $FormA = [Windows.Markup.XamlReader]::Load( $reader )  
    }  
    catch {  
        Write-Warning "Unable to parse XML, with error: $($Error[0])`n Ensure that there are NO SelectionChanged or TextChanged properties in your textboxes (PowerShell cannot process them)"  
        throw  
    }  
  
    $xaml.SelectNodes("//*[@Name]") | % { Write-Host "trying item $($_.Name)" -ForegroundColor Yellow;  
        try { Set-Variable -Name "var_$($_.Name)" -Value $FormA.FindName($_.Name) -ErrorAction Stop }  
        catch { throw }  
    }  
  
    $var_TexB_2.Text = "Some new text"  
    Write-Host "VAR is = $Var_S1_Text and $BBB" -ForegroundColor Green   
    [string]$Var_S1_Text = "Alfa"  
    [string]$BBB = "2"  
    $Var_Button_1.IsCancel = $true  
  
    $Var_Button_1.Add_Click({  
            $FormA.Close() })  
    $result = $FormA.ShowDialog()   
    return $Var_S1_Text, $BBB, $($var_TexB_2.Text);  
  
}  
  
$B = "1"  
$A = @()  
$A = ClickMe $B  
Write-Host "$($A[0]) and $($A[1]) " -ForegroundColor Cyan  
$A[-1]  
$A[-2]

Answer 2

     function ClickMe {  
         Param  
         (  
             [Parameter(Mandatory = $true)] $BBB  
         )  
          
$inputXML = @"  
<Window x:Class="WindowApp0.Window1"  
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
        xmlns:local="clr-namespace:WindowApp0"  
        mc:Ignorable="d"  
        Title="TEST" Height="500" Width="500" Topmost="True" WindowStartupLocation="CenterScreen">  
     <Grid>  
         <Button x:Name="Button_1" Content="Button" HorizontalAlignment="Left" Margin="19,329,0,0" VerticalAlignment="Top" Height="50" Width="200"/>  
         <TextBlock x:Name="TexB_1" HorizontalAlignment="Left" Margin="19,144,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="114" Height="32" Text="Some text"/>  
         <TextBlock x:Name="TexB_2" HorizontalAlignment="Left" Margin="170,144,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="174" Height="26" Text="Some text"/>   
     </Grid>  
</Window>     
"@   
          
         $inputXML = $inputXML -replace 'mc:Ignorable="d"', '' -replace "x:N", 'N' -replace '^<Win.*', '<Window' -replace 'TextChanged="TextBox(.*)', '/>"'  
         [void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')  
         [xml]$XAML = $inputXML  
          
         $reader = (New-Object System.Xml.XmlNodeReader $xaml)  
         try {  
             $FormA = [Windows.Markup.XamlReader]::Load( $reader )  
         }  
         catch {  
             Write-Warning "Unable to parse XML, with error: $($Error[0])`n Ensure that there are NO SelectionChanged or TextChanged properties in your textboxes (PowerShell cannot process them)"  
             throw  
         }  
          
         $xaml.SelectNodes("//*[@Name]") | % { Write-Host "trying item $($_.Name)" -ForegroundColor Yellow;  
             try { Set-Variable -Name "var_$($_.Name)" -Value $FormA.FindName($_.Name) -ErrorAction Stop }  
             catch { throw }  
         }  
          
         $var_TexB_2.Text = "Some new text"  
         [string]$Var_S1_Text = "Alfa"  
         [string]$BBB = "2"  
         $Var_Button_1.IsCancel = $true  
   
         $Var_Button_1.Add_Click({  
                 $FormA.Close() })  
   
         ##################################################  
         $result = $FormA.ShowDialog()  
         return $Var_S1_Text, $BBB, $($var_TexB_2.Text);  
  
   
     }  
          
     $B = "1"  
     $A = @()  
     $A = ClickMe $B  
     $A[-1]  
     $A[-2]

Answer 3

Borut Puhar 66

If I change lines 51 and 52, so thet line
“return $Var_S1_Text, $BBB, $($var_TexB_2.Text);”
“$result = $FormA.ShowDialog()”

Then From is NOT shown.

Issue is what is return in $A.
I expect return for three variable, but I also get return for
trying item Button_1
trying item TexB_1
trying item TexB_2
Alfa and 2
Some new text
2

Expected return should be :
Alfa and 2
Some new text
2
PS: yes this is sample, something to shown the issue..

Rich Matheisen 48,026 Reputation points

2022-11-24T15:32:27.493+00:00

Here are two screenshots of what happens when you run the code in my answer:

Running the script shows the form and the output from the Write-Host:

After clicking the button labeled "Button" (the 1st 4 lines are from the "Write-Host" in the script:

If you're running your script from PowerShell's ISE or from another IDE your form may not appear. If that's the case, save you script and run it from a PowerShell session.
Rich Matheisen 48,026 Reputation points

2022-11-24T15:38:54.997+00:00

Running those two lines in that sequence has the result of returning from your function BEFORE you show the dialog box!

Answer 4

Ok,   
I solve one part : https://riptutorial.com/powershell/example/27037/how-to-work-with-functions-returns  
Now question is :  
I have Function 1   when I click button  it calls Function 2 and then return Values from Function 2  
How to close Function1 to return values to original script. One option is global variables but ?  
Im missing something or it something in front of my nose…  
Function2 ***  
{  
*  
.{  
*  
*  
*  
  
$Var_L1_But0.Add_Click({  
    $var_L1_tex2.Text = $Par1_L1 + $var_L0_tex2.Text  
    # $Form1.Close()  
    })  
$Form1.ShowDialog()   | out-null  
} | Out-Null  
  
return $($var_L1_tex2.Text) # I can se value  
}  
  
  
Function1 ****  
{  
***  
.{  
*  
*  
*  
$Var_L0_But0.Add_Click({  
    $var_L0_tex2.Text = $Par0_L0 + $var_L0_tex2.Text   
    $Sum0 = Function2 1 $var_L0_tex2.Text  
    Write-Host "Varible F0 : $Sum0"  # I can se value  
  
     # return  
    }) | Out-Null  
  
$Form0.ShowDialog()   
  
} | Out-Null  
  
   Write-Host "Varible F0 : $Sum0 and $Sum4"  
   return $Sum0  
  
}  
  
$Sum =Function1 1  
  
$Sum

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WPF PowerShell GUI Function Return values in wrong order when using xaml ?

4 answers

Your answer