Pass parameter to powershell from a windows form file browser - windows

Question

I am trying to pass a parmeter from a windows form dialogue serach box to another script, but cant seem to pull the parameter out from when a user chooses a file. the parameter should be the full file location of a font which a user would like to install. any help would be appreciated, the below script is the forma and the script the parameter needs to go throuh is at the bottom.
cls
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
#Windows form settings
$objForm = New-Object System.Windows.Forms.Form
$objForm.Icon = $Icon
$objForm.Text = "Font Installer"
$objForm.Size = New-Object System.Drawing.Size(350,350)
$objForm.StartPosition = "CenterScreen"
$objForm.FormBorderStyle = "FixedDialog"
$objForm.BackgroundImage = $Image
$objForm.BackgroundImageLayout = "None"
#Browse for file
$d = New-Object Windows.Forms.OpenFileDialog
$d.initialDirectory = $initialDirectory
$d.filter = "All files (*.*)| *.*"
$d.ShowHelp = $true
$d.InitialDirectory = "c:\"
$d.Title = "Choose your Font"
$d.FileName
$d.filter = " Font Files (*.ttf; *.fon; *.fnt; *.ttc; *.otf; *.mmm; *.pbf; *.pfm)| *.ttf; *.fon; *.fnt; *.ttc; *.otf; *.mmm; *.pbf; *.pfm"
#Browse Button
$button1 = New-Object system.Windows.Forms.Button
$button1.Text = "Select Font"
$button1.Add_Click({$d.ShowDialog( )})
$button1.Location = New-Object System.Drawing.Size(100,120)
$button1.Size = New-Object System.Drawing.Size(150,23)
$objForm.controls.add($button1)
#Install Button
$run = New-Object System.Windows.Forms.Button
$run.Location = New-Object System.Drawing.Size(100,170)
$run.Size = New-Object System.Drawing.Size(150,100)
$run.Text = "Install"
$Font1 = New-Object System.Drawing.Font("Arial Black",19, [System.Drawing.FontStyle]::regular)
$run.Font = $Font1
$run.BackColor ="green"
#invoke expression - open install script and sent the parameter to it
$run.Add_Click({
Invoke-Expression "& `"c:\Users\Khussain\Desktop\Fonts\scripts\testparam.ps1`" $d.filename";
})
$objForm.Controls.Add($run)
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()
the script which should get the parameter is named testparam.ps1 and code is below:
param(
[string] $path = ""
)
Write-Host "this is a test the parameter is $path"

Answer 1

Try changing the Add handler to:
$run.Add_Click({
if($d.filename)
{
$path = $d.filename
c:\Users\Khussain\Desktop\Fonts\scripts\testparam.ps1 "'$path'"
}
})

Answer 2

try just this:
$run.Add_Click({ c:\Users\Khussain\Desktop\Fonts\scripts\testparam.ps1 $($d.filename);})