将子项添加到列表视图

Question

我正在使用backgroundworker来填充列表视图，但我也想添加子项目。谁能帮我吗？

Public Class Form1 

    Private Sub bgw_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles bgw.DoWork 
     Dim li As New List(Of ListViewItem) 

     For Each fn As String In My.Computer.FileSystem.GetFiles("s:\Videos", FileIO.SearchOption.SearchAllSubDirectories, "*.*") 
      li.Add(New ListViewItem(My.Computer.FileSystem.GetName(fn))) 
      'here i want to add a subitem containing the filesize 
      'My.Computer.FileSystem.GetFileInfo(fn).Length 
     Next 

     e.Result = li.ToArray 
    End Sub 

    Private Sub bgw_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles bgw.RunWorkerCompleted 
     lv.Items.AddRange(DirectCast(e.Result, ListViewItem())) 
    End Sub 

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
     bgw.RunWorkerAsync() 
    End Sub 
End Class 

Answer 1

在For Each循环试试这个：

Dim NewItem as New ListViewItem(My.Computer.FileSystem.GetName(fn)) 
NewItem.SubItems.Add(My.Computer.FileSystem.GetFileInfo(fn).Length) 

li.Add(NewItem) 

希望这应该做的伎俩

Answer 2

这是工作压力太大，但它是正确的吗？

Public Class Form1 

    Dim item1 As String = "" 
    Dim item2 As String = "" 

    Private Sub bgw_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles bgw.DoWork 
     Dim progress As Integer = 0 
     'calculate progress later 
     progress = 1 

     For Each fn As String In My.Computer.FileSystem.GetFiles("s:\Videos", FileIO.SearchOption.SearchAllSubDirectories, "*.*") 
      item1 = My.Computer.FileSystem.GetName(fn) 
      item2 = My.Computer.FileSystem.GetFileInfo(fn).Length 

      bgw.ReportProgress(progress) 
     Next 
    End Sub 

    Private Sub bgw_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs) Handles bgw.ProgressChanged 
     Dim li As New ListViewItem 
     li = lv.Items.Add(item1, 0) 
     li.SubItems.Add(item2) 
    End Sub 

    Private Sub bgw_RunWorkerCompleted(sender As Object, e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles bgw.RunWorkerCompleted 
    End Sub 

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click 
     lv.Items.Clear() 
     bgw.RunWorkerAsync() 
    End Sub 

End Class