DriveLetter ComboBox 未正确填充

Question

我正在创建一个显示当前未使用/未分配的驱动器号的 GUI 脚本。 虽然该功能正常工作（ECHO 按钮向 PS 写入正确的字母），但 ComboBox 由单个字母填充（见图）。有人可以向我解释我做错了什么吗？

$form = New-Object System.Windows.Forms.Form
$form.Text = 'Test' 
$form.Size = New-Object System.Drawing.Size(280,400) 
$form.StartPosition = 'Manual'
$form.Location      = '10,10'
$form.Topmost = $true  

$button = New-Object System.Windows.Forms.Button
$button.Size = New-Object System.Drawing.Size(50,20)
$button.Location = New-Object System.Drawing.Size(20,20)
$button.Text = "ECHO"
$button.Add_Click($button_click)

$comboBox1 = New-Object System.Windows.Forms.ComboBox 
$comboBox1.Location = New-Object System.Drawing.Point(80, 55) 
$comboBox1.Size = New-Object System.Drawing.Size(98, 10) 
$ComboBox1.DropDownStyle = [System.Windows.Forms.ComboBoxStyle]::DropDownList;

$AllLetters = 67..90 | ForEach-Object {[char]$_ + ":"}
$UsedLetters = Get-WmiObject Win32_LogicalDisk | Select -Expand DeviceID
$FreeLetters = $AllLetters | Where-Object {$UsedLetters -notcontains $_}
ForEach ($Letter in $FreeLetters) { $comboBox1.Items.Add($Drives) }



$button_click = {Write-Host ($FreeLetters)}                   

$form.Controls.AddRange(@($button, $combobox1))
$form.ShowDialog()

Answer 1

在这一行：

ForEach ($Letter in $FreeLetters) { $comboBox1.Items.Add($Drives) }

将$Drives 更改为$Letter