PowerShell 6 - support for Windows GUI libraries

Question

I understand that the new PowerShell 6/core lacks support for Windows GUI libraries, I have developed some important projects in PS-5.1 using the Windows.Forms

Answer 1

It's a russian method, but you can use for the non-PowerShell Core compatible part the default PowerShell "powershell.exe" instead of PowerShell Core "pwsh.exe" in your PowerShell Core script:

Test.ps1:

<# Here you start your script code with your called PowerShell/PowerShell Core: #>
$PSVersionTable
chcp.com 65001;

<# Pause the PowerShell Core code execution and run here a temporary default PowerShell session 
(Non-PowerShell Core) for the Non-PowerShell Core compatible code part: #>
powershell -NoProfile -ExecutionPolicy Bypass -Command {
$PSVersionTable
chcp.com 65001;

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

$objForm = New-Object System.Windows.Forms.Form;

[void] $objForm.ShowDialog();

<# Exit the temporary default Non-PowerShell Core session: #>
exit
}

<# And continue here the PowerShell Core script code #>
$PSVersionTable

This works fine for me with Visual Studio Code and also CLI-only execution with System PowerShell (currently: v5.1) and with the PowerShell Core (currently: v6.1.2).

It's not the best solution and Windows only, but a workaround for Windows systems with installed PowerShells.