Добавление групп через Script в powershell Forms.ListView

Question

Мне нужно добавить группу элементов в ListView, но $listView1.groups.add("groupName") не работает!

$button1.add_click({ 
    # add group 
     $listView1.groups.add("groupName") # Not Work 
    # add items 
    1..3 | %{ 
     $listView1.items.add("Item : $_") # work fine 
    } 
}) 

полный код

#requires -version 2 
Add-Type -AssemblyName 'System.Drawing' 
Add-Type -AssemblyName 'System.Windows.Forms' 

#region $form1 
$form1 = New-Object -TypeName 'System.Windows.Forms.Form' 
$form1.SuspendLayout() 

    #region $listView1 
    $listView1 = New-Object -TypeName 'System.Windows.Forms.ListView' 
    $listView1.Dock = [System.Windows.Forms.DockStyle]::Fill 
    $listView1.View = [System.Windows.Forms.View]::Tile 
    $listView1.Size = New-Object -TypeName 'System.Drawing.Size' -ArgumentList @(250, 200) 
    $listView1.BeginUpdate() 

     #region $listViewGroup1 
     $listViewGroup1 = New-Object -TypeName 'System.Windows.Forms.ListViewGroup' 
     $listViewGroup1.Header = 'Group 1' 

      #region $listViewItem1 
      $listViewItem1 = New-Object -TypeName 'System.Windows.Forms.ListViewItem' 
      $listViewItem1.Text = 'Item 1' 
      #endregion $listViewItem1 

      $listViewItem1.Group = $listViewGroup1 

      #region $listViewItem2 
      $listViewItem2 = New-Object -TypeName 'System.Windows.Forms.ListViewItem' 
      $listViewItem2.Text = 'Item 2' 
      #endregion $listViewItem2 

      $listViewItem2.Group = $listViewGroup1 

     #endregion $listViewGroup1 

     [System.Void]$listView1.Groups.Add($listViewGroup1) 
     [System.Void]$listView1.Items.Add($listViewItem1) 
     [System.Void]$listView1.Items.Add($listViewItem2) 

     #region $listViewGroup2 
     $listViewGroup2 = New-Object -TypeName 'System.Windows.Forms.ListViewGroup' 
     $listViewGroup2.Header = 'Group 2' 

      #region $listViewItem3 
      $listViewItem3 = New-Object -TypeName 'System.Windows.Forms.ListViewItem' 
      $listViewItem3.Text = 'Item 3' 
      #endregion $listViewItem3 

      $listViewItem3.Group = $listViewGroup2 

     #endregion $listViewGroup2 

     [System.Void]$listView1.Groups.Add($listViewGroup2) 
     [System.Void]$listView1.Items.Add($listViewItem3) 

    $listView1.EndUpdate() 
    #endregion $listView1 

    [System.Void]$form1.Controls.Add($listView1) 

    #region $button1 
    $button1 = New-Object -TypeName 'System.Windows.Forms.Button' 
    $button1.Dock = [System.Windows.Forms.DockStyle]::Bottom 
    $button1.Text = 'Add Group' 
    $button1.add_click({ 
     # add group 
      $listView1.groups.add("groupName") # Not Work 
     # add items 
     1..3 | %{ 
      $listView1.items.add("Item : $_") # work fine 
     } 
    }) 
    #endregion $button1 

    [System.Void]$form1.Controls.Add($button1) 

$form1.ResumeLayout($false) 
$form1.PerformLayout() 
#endregion $form1 

#region GUI Startup 
$form1.ShowDialog() 
#endregion GUI Startup 

Answer 1

это necessairy от создания такого объекта, как:

#region $listViewGroup1 
    $listViewGroup1 = New-Object -TypeName 'System.Windows.Forms.ListViewGroup' 
    $listViewGroup1.Header = 'Group 3211' 
    [System.Void]$listView1.Groups.Add($listViewGroup1) 

     $listViewItem1 = New-Object -TypeName 'System.Windows.Forms.ListViewItem' 
     $listViewItem1.Text = 'Item 3211' 
     $listViewItem1.Group = $listViewGroup1 
     [System.Void]$listView1.Items.Add($listViewItem1) 

     $listViewItem2 = New-Object -TypeName 'System.Windows.Forms.ListViewItem' 
     $listViewItem2.Text = 'Item 3212' 
     $listViewItem2.Group = $listViewGroup1 
     [System.Void]$listView1.Items.Add($listViewItem2)