问POWERSHELL:无法将第二个DropDownBox选择作为变量传递

EN

Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
Add-Type -AssemblyName Microsoft.VisualBasic
 
$form = New-Object System.Windows.Forms.Form
 
$image = [System.Drawing.Image]::Fromfile('Path to image')    
$pictureBox = new-object Windows.Forms.PictureBox  #--instantiates a PictureBox
$pictureBox.width=420
$pictureBox.height=420
$pictureBox.top=20
$pictureBox.left=350
$pictureBox.Image=$image
 
#$form.Font = New-Object System.Drawing.Font("Lucida Console",11,[System.Drawing.FontStyle]::Regular)
 
$form = New-Object System.Windows.Forms.Form
$form.Text = 'MSSQL DATABASE BACKUP UTILITY'
$form.Size = New-Object System.Drawing.Size(800,500)
$form.Font = New-Object System.Drawing.Font("Times New Roman",11,[System.Drawing.FontStyle]::Regular)
$form.StartPosition = 'CenterScreen'
$form.Controls.add($pictureBox)
 
$okButton = New-Object System.Windows.Forms.Button
$okButton.Location = New-Object System.Drawing.Point(10,400)
$okButton.Size = New-Object System.Drawing.Size(75,23)
$okButton.Text = 'OK'
$okButton.DialogResult = [System.Windows.Forms.DialogResult]::OK
$form.AcceptButton = $okButton
$form.Controls.Add($okButton)
 
#first DROPDOWN Box
$label = New-Object System.Windows.Forms.Label
$label.Location = New-Object System.Drawing.Point(10,20)
$label.Size = New-Object System.Drawing.Size(280,20)
$label.Text = 'SQL Instance Name'
$form.Controls.Add($label)

$DropDownBox = New-Object System.Windows.Forms.ComboBox
$DropDownBox.Location = New-Object System.Drawing.Size(10,40)
$DropDownBox.Size = New-Object System.Drawing.Size(260,20)
$DropDownBox.DropDownHeight = 200
$Form.Controls.Add($DropDownBox)

$wksList= invoke-sqlcmd -query "select * from VIEW NAME
    order by instance_name" -database DBA -serverinstance INSTANCE_NAME

 
foreach ($wks in $wksList)
    { $DropDownBox.Items.Add($wks.Instance_Name) }
 
$Button = New-Object System.Windows.Forms.Button
$Button.Location = New-Object System.Drawing.Size(10,80)
$Button.Size = New-Object System.Drawing.Size(120,23)
$Button.Text = "Set Instance"

$Form.Controls.Add($Button)

#Add Button event
 $Button.Add_Click(
{   
    #second DROPDOWN Box
    $InstanceName = $DropDownBox.SelectedItem
    $label2 = New-Object System.Windows.Forms.Label
    $label2.Location = New-Object System.Drawing.Point(10,120)
   $label2.Size = New-Object System.Drawing.Size(280,20)
    $label2.Text = 'Database Name'
    $form.Controls.Add($label2)

    $DropDownBox2 = New-Object System.Windows.Forms.ComboBox
    $DropDownBox2.Location = New-Object System.Drawing.Size(10,140)
    $DropDownBox2.Size = New-Object System.Drawing.Size(260,20)
    $DropDownBox2.DropDownHeight = 200
    $Form.Controls.Add($DropDownBox2)

    $wksList2= invoke-sqlcmd -query "select name from sys.databases
    where database_id>4
    order by name" -database MASTER -serverinstance $InstanceName

    foreach ($wks in $wksList2)
        { $DropDownBox2.Items.Add($wks.name) }

})

#end second DROPDOWN box
 
# third text box
$label3 = New-Object System.Windows.Forms.Label
$label3.Location = New-Object System.Drawing.Point(10,220)
$label3.Size = New-Object System.Drawing.Size(280,20)
$label3.Text = 'Desired Backup Location'
$form.Controls.Add($label3)
 
$textBox3 = New-Object System.Windows.Forms.TextBox
$textBox3.Location = New-Object System.Drawing.Point(10,240)
$textBox3.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textBox3)
#end third text box
 
# fourth text box
$label4 = New-Object System.Windows.Forms.Label
$label4.Location = New-Object System.Drawing.Point(10,280)
$label4.Size = New-Object System.Drawing.Size(280,20)
$label4.Text = 'Desired Backup Name'
$form.Controls.Add($label4)
 
$textBox4 = New-Object System.Windows.Forms.TextBox
$textBox4.Location = New-Object System.Drawing.Point(10,300)
$textBox4.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textBox4)
#end fourth text box
 
# fifth text box
$label5 = New-Object System.Windows.Forms.Label
$label5.Location = New-Object System.Drawing.Point(10,340)
$label5.Size = New-Object System.Drawing.Size(280,20)
$label5.Text = 'Your Email Address'
$form.Controls.Add($label5)
 
$textBox5 = New-Object System.Windows.Forms.TextBox
$textBox5.Location = New-Object System.Drawing.Point(10,360)
$textBox5.Size = New-Object System.Drawing.Size(260,20)
$form.Controls.Add($textBox5)
#end fifth text box
 
$form.Topmost = $true
 
$form.Add_Shown({$DropDownBox.Select()})
$result = $form.ShowDialog()
 
if ($result -eq [System.Windows.Forms.DialogResult]::OK)
{
$Server = $DropDownBox.text
$DBName = $DropDownBox2.text
$SharedFolder = $textBox3.text
$BUName = $textBox4.text
$mail = $textBox5.text
 
Get-Variable
 
   <#$Date = Get-Date -format yyyyMMdd#>
Backup-SqlDatabase  -ServerInstance $server `
                    -Database $DBName `
                    -CopyOnly `
                    -CompressionOption on `
                    -BackupFile "$($SharedFolder)\$DBName-$BUName.bak" `
                    -BackupAction Database `
                    -checksum
 
#SMPT Section
 
$From = "SUPPORT EMAIL"
$To = $mail
$Subject = "RECENT MSSQL BACKUP REQUEST"
$Body = "Your MSSQL database backup from $server, $DBName, has been backed up to $SharedFolder. Please check the directory path you specified for your backup. If you have any problems, fwd this email to SUPPORT EMAIL for assistance."
$PSEmailServer = "SMTP SERVER"
 
Send-MailMessage -From $From -To $To -Subject $Subject -Body $Body -SmtpServer $PSEmailserver