我正在尝试编写一个包含列表框的 PowerShell 脚本。为了确保我对所需的概念有所了解,我在 TechNet 上查找了教程并尝试复制提供的代码。
http://technet.microsoft.com/en-us/library/ff730949.aspx
如果我正确地遵循演练和脚本,则脚本似乎旨在显示一个对话框,然后将所选项目输出到 CLI。我复制了对话框,但无法将选择写入 CLI。我什至修改了最后一行以显式调用 Write-Output 以显示 $x 的值。
这个脚本的一切似乎都按预期工作,除了实际写出 $x 的任何值。由于echo "$x"
这可能是所有代码中最简单的一行,我只能假设问题实际上在于将数据写入$x 。
下面是我的 PowerShell ISE 窗口中的剪切和粘贴,它又是从上述 TechNet 文章中剪切和粘贴的:
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Select a Computer"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$objForm.Add_KeyDown({if ($_.KeyCode -eq "Enter")
{$x=$objListBox.SelectedItem;$objForm.Close()}})
$objForm.Add_KeyDown({if ($_.KeyCode -eq "Escape")
{$objForm.Close()}})
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,120)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.Add_Click({$x=$objListBox.SelectedItem;$objForm.Close()})
$objForm.Controls.Add($OKButton)
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,120)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.Add_Click({$objForm.Close()})
$objForm.Controls.Add($CancelButton)
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Size = New-Object System.Drawing.Size(280,20)
$objLabel.Text = "Please select a computer:"
$objForm.Controls.Add($objLabel)
$objListBox = New-Object System.Windows.Forms.ListBox
$objListBox.Location = New-Object System.Drawing.Size(10,40)
$objListBox.Size = New-Object System.Drawing.Size(260,20)
$objListBox.Height = 80
[void] $objListBox.Items.Add("atl-dc-001")
[void] $objListBox.Items.Add("atl-dc-002")
[void] $objListBox.Items.Add("atl-dc-003")
[void] $objListBox.Items.Add("atl-dc-004")
[void] $objListBox.Items.Add("atl-dc-005")
[void] $objListBox.Items.Add("atl-dc-006")
[void] $objListBox.Items.Add("atl-dc-007")
$objForm.Controls.Add($objListBox)
$objForm.Topmost = $True
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()
echo "$x"
当上面没有按预期工作时,我决定按照教程一步一步地自己重新编写脚本。我对其进行了一些修改,以更好地适应我的组织偏好并在此过程中添加注释。然而,现在连对话框本身都坏了。
# Load Windows Forms & Drawing classes.
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
# Create base form.
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Select a Computer"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
# Configure keyboard intercepts for ESC & ENTER.
$objForm.KeyPreview = $true
$objForm.Add_KeyDown({
if ($_.KeyCode -eq "Enter")
{
$x = $objListBox.SelectedItem
$objForm.Close()
}
})
$objForm.Add_KeyDown({
if ($_.KeyCode -eq "Escape")
{
$objForm.Close()
}
})
# Create OK button.
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,120)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.Add_Click({
$x = $objListBox.SelectedItem
$objForm.Close()
})
$objForm.Controls.Add($OKButton)
# Create Cancel button.
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,120)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.Add_Click({
$objForm.Close()
})
$objForm.Controls.Add($CancelButton)
# Add form prompt text.
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Text = "Please select a computer:"
$objForm.Controls.Add($objLabel)
# Add list box.
$objListBox = New-Object System.Windows.Forms.ListBox
$objListBox.Location = New-Object System.Drawing.Size(10,40)
$objListBox.Size = New-Object System.Drawing.Size(260,20)
$objListBox.Height = 80
# Populate list.
[void] $objListBox.Items.Add("Option1")
[void] $objListBox.Items.Add("Option2")
[void] $objListBox.Items.Add("Option3")
[void] $objListBox.Items.Add("Option4")
[void] $objListBox.Items.Add("Option5")
[void] $objListBox.Items.Add("Option6")
[void] $objListBox.Items.Add("Option7")
# Force list box to display on top of other windows.
$objForm.TopMost = $true
# Display list box.
$objForm.Add_Shown({
$objForm.Activate()
})
[void] $objForm.ShowDialog()
# Show result.
$x
第二个代码块导致:
我在这里做错了什么?
注意:我在 Windows 7 上运行 PowerShell 3.0