ComboBox.SelectedItem给出零值

Question

我被困在这里面一整天了。我正在使用PowerShell表单创建一个UI。在这方面：

• 用户从第一个组合框中选择一个选项。根据所选选项单击Go
• ，将出现一个具有另一个组合框的面板。如果用户在第一个组合框中选择另一个选项，则另一个面板在从面板组合框中选择选项后出现另一个组合框
• ，用户单击开始按钮。
• 将导致将所选选项存储到变量的函数。

f 211

问题

• 现在当用户从面板的组合框中选择选项时，我使用$combobox.selecteditem.Tostring来获取值。，但它给我的结果为空。这里是我的代码。System.Windows.Forms.Application::EnableVisualStyles() $global:Button1Clicked = 0；加式-AssemblyName System.Windows.Forms Add-Type -AssemblyName System.Drawing System.Windows.Forms.FormClosingEventHandler $Form = New-Object system.Windows.Forms.Form $Form.ClientSize = '1500,800‘$Form.text = "NextUI“$Form.BackColor = 'White’$Form.TopMost = $true $Form.add_closing( { if( $global:Button2Clicked ) {$global:Button2Clicked= 0；$global:Button2Clicked=；( }) $panel1 =新对象system.Windows.Forms.Panel $panel1.AutoSize = $true $panel1.Width = 1200 $panel1.Height =200 $panel1.location =新对象system.Drawing.Point(50,100) $panel1.Visible = $false $panel1.Controls.Add($label3) $panel1.Controls.Add($comboBox2) $panel1.BorderStyle =1 $panel2 =新对象system.Windows.Forms.Panel =$panel1.BorderStyle= 1200 = 200 = New-Object (50,100)=$false $panel2.Controls.Add($label4) $panel2.Controls.Add($ComboBox3) $panel2.BorderStyle =1 $Label1 =新对象system.Windows.Forms.Label $Label1.text = "Select“$Label1.AutoSize = $true $Label1.location = New-Object System.Drawing.Point(35,50) $Label1.Font = 'segoe ui，9.5‘$Label2 =新对象system.Windows.Forms.Label $Label2.text = "SharePoint Settings“$Label2.AutoSize = $true $Label2.location = New-Object System.Drawing.Point(35,15) $Label2.Font = 'Segoe UI半粗体，9.5’$Label3 =新对象system.Windows.Forms.Label $Label3.text =”选择文件和文件夹权限选项“$Label3.AutoSize = $true $Label3.location = New-Object System.Drawing.Point(100,200) $Label3.Font = 'segoe ui，9.5‘$Label4 =新对象system.Windows.Forms.Label $Label4.AutoSize = $True $Label4.text =“文件权限”$Label4.location =新对象System.Drawing.Point(100,200) $Label4.Font = 'Segoe，9.5‘################模块组合框################ $ComboBox1 = New-Object system.Windows.Forms.ComboBox $ComboBox1.text = "Select“$ComboBox1.width = 200 $ComboBox1.height = 20 $ComboBox1.location = New-Object System.Drawing.Point(310，45) $ComboBox1.Font = 'Microsoft，10‘$combobox1.items.Add("ControlSettings") $combobox1.items.Add("NextSettings") ########文件和文件夹权限############# $ComboBox2 = New-Object system.Windows.Forms.ComboBox $ComboBox2.text = "select a option“$ComboBox2.width = 200 $ComboBox2.height = 20 $ComboBox2.location = New-Object System.Drawing.Point(450,200) $ComboBox2.Font = 'Microsoft，10‘$ComboBox2.items.Add(“查看”)$ComboBox2.items.Add(“编辑”) $ComboBox3 =新对象system.Windows.Forms.ComboBox $ComboBox3.text =“选择选项”$ComboBox3.width = 200 $ComboBox3.height = 20 $ComboBox3.location =新对象System.Drawing.Point(450,200) $ComboBox3.Font = 'Microsoft，10‘$ComboBox3.items.Add(“查看”)$ComboBox3.items.Add(“编辑”)函数Button2_Click() { if ($ComboBox1.SelectedIndex -eq 0) { $panel2.Visible = $true $panel1.Visible = $false } if ($ComboBox1.SelectedIndex -eq 1) { $panel1.Visible = $true $panel2.Visible = $false } $Button1 = New-Object $Button1= "Start“$Button1= 150 = 30 =’F6CEE3‘$Button1.DialogResult = System.Windows.Forms.DialogResult::OK $Button1.location =新对象System.Drawing.Point(500，$Button1.Font = 'segoe，10‘$Button1.Add_Click({ Button1_Click；$global:Button1Clicked = 1；}) ############# Button 'Go‘############# $Button2 = New-Object system.Windows.Forms.Button $Button2.text = "Go“$Button2.width = 100 $Button2.height = 30 $Button2.BackColor = '#F6CEE3’$Button2.DialogResult = System.Windows.Forms.DialogResult::OK $Button2.location = New-Object System.Drawing.Point(680，43) $Button2.Font = 'segoe，10‘$Button2.Add_Click({ Button2_Click；$global:Button2Clicked = 1；}) #########代码启动###########函数Button1_Click() { $link = $comboBox2.SelectedItem.ToString()；$linktype = $comboBox3.SelectedItem.ToString()；}代码void$Form.ShowDialog()

####### end of ###### $form.Controls.Add($Panel1) $form.Controls.Add($Panel2) $form.Controls.Add($button1) $form.Controls.Add($comboBox1) $form.Controls.Add($button2) $form.Controls.Add($pictureBox1) $form.Controls.Add($pictureBox1) $form.Controls.Add($label1) $label1({(()) })

Answer 1

问题是您的变量是在一个函数中设置的，所以它们的作用域是该函数。没有理由将其放入函数中，而是直接放在.add_click()中。或者，如果您认为需要将其保存在函数中，则可以像对$global:ButtonClicked那样对变量进行范围调整，并将它们设置为$global:Link和$global:LinkType。

编辑： Order确实在PowerShell中起了作用，所以我确实在脚本中移动了一些东西以使其正常工作，但是当我将它们放在全局范围内时，我能够得到很好的反映它们的值。

$global:Button1Clicked = 0;
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
[System.Windows.Forms.Application]::EnableVisualStyles()
[System.Windows.Forms.FormClosingEventHandler]

######### code Starts ###########

function Button1_Click()
{
    write-host "Link = $global:link"
    write-host "Link Type = $global:linktype"

}

Function Button2_Click()
{

if ($ComboBox1.SelectedIndex -eq 0)
{
$panel2.Visible = $true
$panel1.Visible = $false
}

if ($ComboBox1.SelectedIndex -eq 1)
{
$panel1.Visible = $true
$panel2.Visible = $false

}


}

####### end of code ######

$Form = New-Object system.Windows.Forms.Form
$Form.ClientSize = '1500,800'
$Form.text = "NextUI "
$Form.BackColor = 'White'
$Form.TopMost = $true
$Form.add_closing(
{
if($global:Button2Clicked)
{
$global:Button2Clicked = 0;

$_.cancel = $true;
}
})

################ Module combo box ################

$ComboBox1 = New-Object system.Windows.Forms.ComboBox
$ComboBox1.text = "Select Module"
$ComboBox1.width = 200
$ComboBox1.height = 20
$ComboBox1.location = New-Object System.Drawing.Point(310, 45)
$ComboBox1.Font = 'Microsoft Sans Serif,10'
$combobox1.items.Add("ControlSettings")
$combobox1.items.Add("NextSettings")


######## file and folder permission #############
$ComboBox2 = New-Object system.Windows.Forms.ComboBox
$ComboBox2.text = "select an option"
$ComboBox2.width = 200
$ComboBox2.height = 20
$ComboBox2.location = New-Object System.Drawing.Point(450, 200)
$ComboBox2.Font = 'Microsoft Sans Serif,10'
$ComboBox2.items.AddRange(@("View","Edit") )
#$ComboBox2.items.Add("Edit") 

$ComboBox3 = New-Object system.Windows.Forms.ComboBox
$ComboBox3.text = "select an option"
$ComboBox3.width = 200
$ComboBox3.height = 20
$ComboBox3.location = New-Object System.Drawing.Point(450, 200)
$ComboBox3.Font = 'Microsoft Sans Serif,10'
$ComboBox3.items.Add("View") 
$ComboBox3.items.Add("Edit")

$panel1 = New-Object system.Windows.Forms.Panel
$panel1.AutoSize = $true
$panel1.Width = 1200
$panel1.Height = 200
$panel1.location = New-Object System.Drawing.Point(50,100)
$panel1.Visible = $false
$panel1.Controls.Add($label3)
$panel1.Controls.Add($comboBox2)
$panel1.BorderStyle = 1


$panel2 = New-Object system.Windows.Forms.Panel
$panel2.AutoSize = $true
$panel2.Width = 1200
$panel2.Height =200
$panel2.location = New-Object system.Drawing.Point(50,100)
$panel2.Visible = $false
$panel2.Controls.Add($label4)
$panel2.Controls.Add($ComboBox3)
$panel2.BorderStyle = 1

$Label1 = New-Object system.Windows.Forms.Label
$Label1.text = "Select Module"
$Label1.AutoSize = $true
$Label1.location = New-Object System.Drawing.Point(35,50)
$Label1.Font = 'segoe ui,9.5'

$Label2 = New-Object system.Windows.Forms.Label
$Label2.text = "SharePoint Settings"
$Label2.AutoSize = $true
$Label2.location = New-Object System.Drawing.Point(35,15)
$Label2.Font = 'Segoe UI Semibold,9.5'

$Label3 = New-Object system.Windows.Forms.Label
$Label3.text = "Choose file and folder permission option"
$Label3.AutoSize = $true
$Label3.location = New-Object System.Drawing.Point(100,200)
$Label3.Font = 'segoe ui,9.5'


$Label4 = New-Object system.Windows.Forms.Label
$Label4.AutoSize = $True
$Label4.text = "File Permission"
$Label4.location = New-Object System.Drawing.Point(100,200)
$Label4.Font = 'Segoe UI ,9.5'


$Button1 = New-Object system.Windows.Forms.Button
$Button1.text = "Start"
$Button1.width = 150
$Button1.height = 30
$Button1.BackColor = '#F6CEE3'
$Button1.DialogResult = [System.Windows.Forms.DialogResult]::OK
$Button1.location = New-Object System.Drawing.Point(500, 700)
$Button1.Font = 'segoe ui,10'
$Button1.Add_Click({
$global:link = $comboBox2.SelectedItem.ToString();
$global:linktype = $comboBox3.SelectedItem.ToString();
Button1_Click;
$global:Button1Clicked = 1;
})

############# Button 'Go' #############

$Button2 = New-Object system.Windows.Forms.Button
$Button2.text = "Go"
$Button2.width = 100
$Button2.height = 30
$Button2.BackColor = '#F6CEE3'
$Button2.DialogResult = [System.Windows.Forms.DialogResult]::OK
$Button2.location = New-Object System.Drawing.Point(680, 43)
$Button2.Font = 'segoe ui,10'
$Button2.Add_Click({
Button2_Click;
$global:Button2Clicked = 1;
})

$form.Controls.Add($Panel1)
$form.Controls.Add($Panel2)
$form.Controls.Add($button1)
$form.Controls.Add($comboBox1)
$form.Controls.Add($button2)
$form.Controls.Add($pictureBox1)
$form.Controls.Add($label1)
$form.Controls.Add($label2)

[void]$Form.Add_Shown({ $Form.Activate() })
[void]$Form.ShowDialog()

当我运行它时，设置两个组合框值，并单击Start，我在ISE中得到了文本，上面写着我将链接和LinkType变量设置为什么，并且能够回显$global:link和$global:linktype以查看正确分配的值。