POWERSHELL：无法将第二个 DropDownBox 选择作为变量传递

Question

这是自动 SQL 备份例程...

这个过程应该列出 SQL 服务器名称（基于对数据库的查询）... 您在第一个框中选择一个...

然后根据该选择，它仅在第二个框中显示 SQL 服务器上的数据库...

有几个文本框，按预期工作。

然后它将这些值向下传递到备份例程所在的代码底部，执行例程，然后发送电子邮件。

我从第一个下拉列表中选择一个服务器，单击按钮 'set' 将该选择作为变量，然后对数据库的查询使用第一个框中的值来仅显示该服务器上的数据库服务器...并将正确的数据库列表填充到第二个下拉列表中。

我的问题是我不知道如何正确添加第二个按钮以将第二个下拉框中的选项设置为稍后在备份例程中使用的变量。所以，代码底部没有值传递给 $DBName 变量，所以它不知道要支持 uip 的数据库，所以失败。

如有任何建议，我们将不胜感激。

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

Answer 1

您可能需要此的 C# 或 VB 版本以供参考。您不会找到很多从 PowerShell 使用 WinForms 的示例。特别是您可能想了解布局面板，而不是对所有控件使用固定的定位和大小调整。

无论如何，您的问题是您在 OnClick 事件中动态添加了组合框，而在关闭对话框后您并没有真正引用它。您总是可以 find a control by its name，但如果您有引用每个控件的变量（它们的名称应该比 ComboBox2 等更好），那么通常不需要这样做。

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)

$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)

$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)

#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


#event handlers
#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)


    $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) }

})


#Initialize
$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) }

 
$form.Topmost = $true
 
$form.Add_Shown({$DropDownBox.Select()})

#show form and wait for input
$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
 
    write-output $DropDownBox2
    Write-Output "Db $DbName"

 }

POWERSHELL：无法将第二个 DropDownBox 选择作为变量传递

POWERSHELL: Can't get 2nd DropDownBox choice passed as variable

sql-server

powershell

combobox