Read multi line input from users in PowerShell using messagebox

read-multi-line-input-from-powershell.ps1

    # This script is used in a blog post on the https://mohitgoyal.co/2017/04/16/read-multi-line-input-from-users-in-powershell/. Please
    # read the blog post for more information 
    
    function Read-MultiLineInputBoxDialog([string]$Message, [string]$WindowTitle, [string]$DefaultText)
    {
        Add-Type -AssemblyName System.Drawing
        Add-Type -AssemblyName System.Windows.Forms
     
        # Create the Label.
        $label = New-Object System.Windows.Forms.Label
        $label.Location = New-Object System.Drawing.Size(10,10) 
        $label.Size = New-Object System.Drawing.Size(280,20)
        $label.AutoSize = $true
        $label.Text = $Message
     
        # Create the TextBox used to capture the user's text.
        $textBox = New-Object System.Windows.Forms.TextBox 
        $textBox.Location = New-Object System.Drawing.Size(10,40) 
        $textBox.Size = New-Object System.Drawing.Size(575,200)
        $textBox.AcceptsReturn = $true
        $textBox.AcceptsTab = $false
        $textBox.Multiline = $true
        $textBox.ScrollBars = 'Both'
        $textBox.Text = $DefaultText
     
        # Create the OK button.
        $okButton = New-Object System.Windows.Forms.Button
        $okButton.Location = New-Object System.Drawing.Size(415,250)
        $okButton.Size = New-Object System.Drawing.Size(75,25)
        $okButton.Text = "OK"
        $okButton.Add_Click({ $form.Tag = $textBox.Text; $form.Close() })
     
        # Create the Cancel button.
        $cancelButton = New-Object System.Windows.Forms.Button
        $cancelButton.Location = New-Object System.Drawing.Size(510,250)
        $cancelButton.Size = New-Object System.Drawing.Size(75,25)
        $cancelButton.Text = "Cancel"
        $cancelButton.Add_Click({ $form.Tag = $null; $form.Close() })
     
        # Create the form.
        $form = New-Object System.Windows.Forms.Form 
        $form.Text = $WindowTitle
        $form.Size = New-Object System.Drawing.Size(610,320)
        $form.FormBorderStyle = 'FixedSingle'
        $form.StartPosition = "CenterScreen"
        $form.AutoSizeMode = 'GrowAndShrink'
        $form.Topmost = $True
        $form.AcceptButton = $okButton
        $form.CancelButton = $cancelButton
        $form.ShowInTaskbar = $true
     
        # Add all of the controls to the form.
        $form.Controls.Add($label)
        $form.Controls.Add($textBox)
        $form.Controls.Add($okButton)
        $form.Controls.Add($cancelButton)
     
        # Initialize and show the form.
        $form.Add_Shown({$form.Activate()})
        $form.ShowDialog() > $null   # Trash the text of the button that was clicked.
     
        # Return the text that the user entered.
        return $form.Tag
    }

    $multiLineText = Read-MultiLineInputBoxDialog -Message "Please enter some text. It can be multiple lines" -WindowTitle "Multi Line Example" -DefaultText "Enter some text here..."
    if ($multiLineText -eq $null) { Write-Host "You clicked Cancel" }
    else { Write-Host "You entered the following text: $multiLineText" }