Question

大家好！

我有一个为公司制作的Powershell程序。我有2个列表框，一个带有打印机品牌，另一个用于打印机型号。我希望获得帮助，以用户在“制造”列表中选择的内容填充“模型”列表。我知道执行选择的项目可能会起作用，但是无论我做什么，它都不会填充“模型”列表。

这是我第一次编程，自学成才。现在，我正在使用Windows.Forms来制作GUI。

感谢您的帮助。非常感谢您这个由志同道合的令人敬畏的社区所组成！

*代码：

Add-Type -AssemblyName System.Windows.Forms
$Form_Service = New-Object system.Windows.Forms.Form
$Form_Service.ClientSize = '452,400'
$Form_Service.text = "Service Call"
$Form_Service.TopMost = $true
$Form_Service.StartPosition = 'CenterScreen'

$Label_ValleyID = New-Object system.Windows.Forms.Label
$Label_ValleyID.text = "Enter Valley ID"
$Label_ValleyID.AutoSize = $true
$Label_ValleyID.width= 25
$Label_ValleyID.height = 10
$Label_ValleyID.location = New-Object System.Drawing.Point(45,41)
$Label_ValleyID.Font = 'Microsoft Sans Serif,10'

$TextBox_ValleyID= New-Object system.Windows.Forms.TextBox
$TextBox_ValleyID.multiline= $false
$TextBox_ValleyID.width= 180
$TextBox_ValleyID.height = 20
$TextBox_ValleyID.location = New-Object System.Drawing.Point(45,62)
$TextBox_ValleyID.Font = 'Microsoft Sans Serif,10'

$Label_Make= New-Object system.Windows.Forms.Label
$Label_Make.text = "Make"
$Label_Make.AutoSize = $true
$Label_Make.width= 25
$Label_Make.height = 10
$Label_Make.location = New-Object System.Drawing.Point(45,108)
$Label_Make.Font = 'Microsoft Sans Serif,10'

$ListBox_Make= New-Object system.Windows.Forms.ListBox
$ListBox_Make.text = "Make"
$ListBox_Make.width= 144
$ListBox_Make.height = 50
$ListBox_Make.location = New-Object System.Drawing.Point(45,129)

[void] $ListBox_Make.Items.Add('Brother')
[void] $ListBox_Make.Items.Add('Canon')
[void] $ListBox_Make.Items.Add('HP')
[void] $ListBox_Make.Items.Add('Kyocera')
[void] $ListBox_Make.Items.Add('Ricoh')
[void] $ListBox_Make.Items.Add('Sharp')

$Label_Model = New-Object system.Windows.Forms.Label
$Label_Model.text= "Model"
$Label_Model.AutoSize= $true
$Label_Model.width = 25
$Label_Model.height= 10
$Label_Model.location= New-Object System.Drawing.Point(259,108)
$Label_Model.Font= 'Microsoft Sans Serif,10'

$ListBox_Model = New-Object system.Windows.Forms.ListBox
$ListBox_Model.text= "Model"
$ListBox_Model.width = 146
$ListBox_Model.height= 50
$ListBox_Model.location= New-Object System.Drawing.Point(259,129)

$Label_Location= New-Object system.Windows.Forms.Label
$Label_Location.text = "Location"
$Label_Location.AutoSize = $true
$Label_Location.width= 25
$Label_Location.height = 10
$Label_Location.location = New-Object System.Drawing.Point(45,195)
$Label_Location.Font = 'Microsoft Sans Serif,10'

$TextBox_Location= New-Object system.Windows.Forms.TextBox
$TextBox_Location.multiline= $false
$TextBox_Location.width= 363
$TextBox_Location.height = 20
$TextBox_Location.location = New-Object System.Drawing.Point(45,215)
$TextBox_Location.Font = 'Microsoft Sans Serif,10'

$Label_Problem = New-Object system.Windows.Forms.Label
$Label_Problem.text= "State what is wrong:"
$Label_Problem.AutoSize= $true
$Label_Problem.width = 25
$Label_Problem.height= 10
$Label_Problem.location= New-Object System.Drawing.Point(45,250)
$Label_Problem.Font= 'Microsoft Sans Serif,10'

$TextBox_Problem = New-Object system.Windows.Forms.TextBox
$TextBox_Problem.multiline = $false
$TextBox_Problem.width = 364
$TextBox_Problem.height= 100
$TextBox_Problem.location= New-Object System.Drawing.Point(45,270)
$TextBox_Problem.Font= 'Microsoft Sans Serif,10'

$CheckBox_Nope = New-Object system.Windows.Forms.CheckBox
$CheckBox_Nope.text= "Is your printer inoperable?"
$CheckBox_Nope.width = 250
$CheckBox_Nope.height= 50 
$CheckBox_Nope.location= New-Object System.Drawing.Point(145,295)
$CheckBox_Nope.Font = 'Microsoft Sans Serif,10'

$Button_Submit = New-Object system.Windows.Forms.Button
$Button_Submit.text= "Submit"
$Button_Submit.width = 70
$Button_Submit.height= 30
$Button_Submit.location= New-Object System.Drawing.Point(189,345)
$Button_Submit.Font= 'Microsoft Sans Serif,10'

$Form_Service.controls.AddRange(@($Label_ValleyID,$Label_Make,$Label_Model,$Label_Location,$Label_Problem,$TextBox_ValleyID,$ListBox_Make,$ListBox_Model,$TextBox_Location,$TextBox_Problem,$Button_Submit,$CheckBox_Nope))

if ($ListBox_Make.SelectedItem -eq "Brother"){
[void] $ListBox_Model.Items.Add('MP301')
}

[void]$Form_Service.ShowDialog()

Answer 1

好的，所以您要寻找的就是事件。事件是发生的操作，可让您在操作之后运行代码。就像当鼠标单击对象或按下键盘按钮时一样。

在Powershell中处理Winforms时，可以使用

$Control.Add_EventName{
    Code Here
}

在已调用控件之后放置事件。我通常在显示表格之前就把它们放好。

$ListBox_Make.Add_Click{
    $ListBox_Model.Items.Add($ListBox_Make.SelectedItem)
}

[void]$Form_Service.ShowDialog()

在您的确切情况下，您可以使用：

$ListBox_Make.Add_Click{
    if ($ListBox_Make.SelectedItem -eq "Brother"){
        [void] $ListBox_Model.Items.Add('MP301')
    }
}

希望这会让您走上正确的轨道。

也不要一堆if语句尝试使用Switch

$ListBox_Make.Add_Click{
    switch ($ListBox_Make.SelectedItem){
        "Brother"{
            $ListBox_Model.Items.Add('MP301')
        }
        "Canon"{
            $ListBox_Model.Items.Add('LT45')
        }
        "HP"{
            $ListBox_Model.Items.Add('ABC2133')
        }
    }
}

您可以找到列表框的事件 https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.listbox?view=netframework-4.7.2#events

从另一个列表框中的selected.item填充列表框

1 个答案: