從函數中返回一個ArrayList

Question

所以我有一個poweshell窗體，您可以在其中將用戶添加到列表框並同時添加到數組列表。當我嘗試返回所有用戶的數組列表時，它不返回任何內容。

這裏是我的代碼

#---------------------# 
# Function AddUserGUI # 
#---------------------# 
Function AddUserGUI() 
{ 
    $AllUsers = New-Object System.Collections.ArrayList 

    #---Form  
    $Form     = New-Object System.Windows.Forms.Form 
    $Form.FormBorderStyle = "FixedSingle" 
    $Form.Size   = New-Object System.Drawing.Size(295,280) 
    $Form.MaximizeBox  = $False 
    $Form.Text   = "Add User(s)" 
    $Form.StartPosition = "CenterScreen" 
    $Form.Font   = New-Object System.Drawing.Font("Segoe UI",9,0,3,1) 

    #---TexBox 
    $objTextBox   = New-Object System.Windows.Forms.TextBox 
    $objTextBox.Location = New-Object System.Drawing.Size(10,10) 
    $objTextBox.Size  = New-Object System.Drawing.Size(183,100) 
    $objTextBox.MaxLength = 100 

    #---ListBox 
    $objListBox      = New-Object System.Windows.Forms.ListBox 
    $objListBox.Location   = New-Object System.Drawing.Size(10,45) 
    $objListBox.Size    = New-Object System.Drawing.Size(183,199) 
    $objListBox.HorizontalScrollbar = $True 

    #---Buttons 
    $Add   = New-Object System.Windows.Forms.Button 
    $Add.Location = New-Object System.Drawing.Size(205,10) 
    $Add.Size  = New-Object System.Drawing.Size(75,23) 
    $Add.FlatStyle = "PopUp" 
    $Add.Text  = "Add" 

    $Remove   = New-Object System.Windows.Forms.Button 
    $Remove.Location = New-Object System.Drawing.Size(205,45) 
    $Remove.Size  = New-Object System.Drawing.Size(75,23) 
    $Remove.FlatStyle = "PopUp" 
    $Remove.Text  = "Remove" 

    $Confirm   = New-Object System.Windows.Forms.Button 
    $Confirm.Location = New-Object System.Drawing.Size(205,220) 
    $Confirm.Size  = New-Object System.Drawing.Size(75,23) 
    $Confirm.FlatStyle = "PopUp" 
    $Confirm.Text  = "Confirm" 

    #---Buttons On-Click Actions  
    $Add_OnClick= 
    { 
     if($objTextBox.Text -ne "") 
     { 
      $UserChk = $true #[Bool](Get-ADObject -Filter { sAMAccountName -eq $objTextBox.Text } -Searchbase "ou=User_PFS,dc=pfs,dc=local") 

      if($UserChk -eq $True) 
      { 
       if($objListBox.Items -contains $objTextBox.Text) {DisplayMsgBox "User already in list." "Duplicate entry" "Information" 0} 

       ElseIf($objTextBox.Text -ne $NULL -and $objListBox.Items -notcontains $objTextBox.Text) 
       { 
        $objListBox.Items.Add($objTextBox.Text) 
        [void]$AllUsers.Add($objTextBox.Text) 
       } 
      } 

      ElseIf($UserChk -eq $False) {DisplayMsgBox "User not found." "Invalid User Name" "Information" 0} 

      $objTextBox.Text = "" 
     } 
    } 

    $Remove_OnClick= 
    { 
     $AllUsers.Remove($objListBox.SelectedItem) 
     $objListBox.Items.Remove($objListBox.SelectedItem) 
    } 

    $Confirm_OnClick= 
    { 
     if($AllUsers.Count -eq 0) 
     { 
      DisplayMsgBox "Please add at least one user to the list." "No Users Found" "Information" 0 
     } 

     ElseIf($AllUsers.Count -gt 0) 
     { 
      $Form.Close() 

      Return $AllUsers 
     } 
    } 

    #---Adding Elements to the form 
    $Add.add_Click($Add_OnClick) 
    $Remove.add_Click($Remove_OnClick) 
    $Confirm.add_Click($Confirm_OnClick) 

    $Form.Controls.Add($objListBox) 
    $Form.Controls.Add($objTextBox) 
    $Form.Controls.Add($Add) 
    $Form.Controls.Add($Remove) 
    $Form.Controls.Add($Confirm) 

    #---Display Form 
    $Form.ShowDialog()| Out-Null 
} 

$AllUsers = AddUserGUI 

foreach($User in $AllUsers){write-host $User} 

foreach循環任何沒有輸出。我怎樣才能正確地返回這個數組列表？

Answer 1

領先並沒有解決這個問題。我能得到它，像這樣的工作：

新增$ ExitForm = $真

$Confirm_OnClick= 
    { 
     if($AllUsers.Count -eq 0) 
     { 
      DisplayMsgBox "Please add at least one user to the list." "No Users Found" "Information" 0 
     } 

     ElseIf($AllUsers.Count -gt 0) 
     { 
      $Form.Close() 

      $ExitForm = $True 
     } 
    } 

而且也是在函數的末尾：

if($ExitForm -eq $True) {Return $AllUsers} 

我不知道爲什麼我不能在表單中直接返回它。

Answer 2

使用領先的，你回來之前，以防止管道從展開成元素的流：

function return-arraylist 
{ 
    $arraylist = new-object collections.arraylist 
    [void]$arraylist.Add('Item one') 
    [void]$arraylist.Add('Item two') 
    return ,$arraylist 
} 

(return-arraylist).gettype() 



IsPublic IsSerial Name          BaseType       
-------- -------- ----          --------       
True  True  ArrayList        System.Object