SelectedIndexChanged cascades with multiselect .. is there an 'after selected' event

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  What I settled on was to create a thread that gathers the selected items after sleeping for 200 ms.
  
      Private Sub lv_Group_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lv_Group.SelectedIndexChanged
          ' problem. Each time a row is selected (in a multiselect) this event fires
          ' causing a massive amount of unneccessary work. If 10 items are selected, we go through here 10 freekin times.
          If Not select_ThreadBusy Then
              ' prevent more than one selection thread
              select_ThreadBusy = True
              Dim selThread As New Thread(AddressOf selectionThread)
              ' waits 200 while the SelectedIndexChanged can finish selecting
              selThread.Start()
          End If
  ....
  
  
  
      Sub selectionThread()
          If lv_Group.InvokeRequired Then
              Dim npd As noParamDelegate = New noParamDelegate(AddressOf selectionThread)
              lv_Group.Invoke(npd)
          Else
              Application.DoEvents()
              Thread.Sleep(200)
              Dim itemsSelected As ListView.SelectedListViewItemCollection
  
  ....
  

  martedì 15 dicembre 2009 23:44
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  A ListView has a SelectedItems collection why not wait to process the items until a button is pressed .
  
  

      Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  
          MessageBox.Show(ListView1.SelectedItems.Count)
  
          For Each I As ListViewItem In ListView1.SelectedItems
  
              'Code for the selected Items
          Next
  
      End Sub

  ---

  coding for fun Be a good forum member mark posts that contain the answers to your questions or those that are helpful
  Please format the code in your posts with the button . Makes it easier to read .

  • Contrassegnato come risposta Martin_Xie martedì 22 dicembre 2009 06:42

  mercoledì 16 dicembre 2009 07:31
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  Here is something else you might try . When you release the control key which you must press for a multiselect this event handler will execute . The limitation is that you must use the control key while selecting or press and release it for a single item
  
  

   
      Private Sub ListView1_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles ListView1.KeyUp
          If e.KeyData = 17 Then
  
              MessageBox.Show(ListView1.SelectedItems.Count)
  
              For Each I As ListViewItem In ListView1.SelectedItems
  
                  'Code for the selected Items
              Next
          End If
          ListView1.SelectedItems.Clear() ' unselect the items
      End Sub

  ---

  coding for fun Be a good forum member mark posts that contain the answers to your questions or those that are helpful
  Please format the code in your posts with the button . Makes it easier to read .

  mercoledì 16 dicembre 2009 07:39
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  You are using mutlithreading in an ASPNET application?
  
  Try to avoid that, I would use Ajax or use an ack button in your case.
  
  

  ---

  Success
  Cor

  mercoledì 16 dicembre 2009 07:45
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  You can also use the KeyPress event to ckeck for the enter key
  
  

      Private Sub ListView1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles ListView1.KeyPress
          If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
  
              MessageBox.Show(ListView1.SelectedItems.Count)
  
              For Each I As ListViewItem In ListView1.SelectedItems
  
                  'Code for the selected Items
              Next
          End If
          ListView1.SelectedItems.Clear() ' unselect the items
  
      End Sub

  ---

  coding for fun Be a good forum member mark posts that contain the answers to your questions or those that are helpful
  Please format the code in your posts with the button . Makes it easier to read .

  mercoledì 16 dicembre 2009 07:53
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  I choose this workaround:

  wrote the eventhandler and hooked it to KeyUp and MouseUp event.

  This should do for the most Forms-Applications.

  venerdì 28 agosto 2020 14:51