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.NET Forum / Windows Forms / WinForm General / June 2006ListView loading slowly
I am loading a ListView like this... foreach (DataRow dr in dt.Rows) { ListViewItem lvi= new ListViewItem((string)dr["field1"]); lvi.Tag = (string)dr["field2"]; listviewTest.Items.Add(lvi); } The DataTable is large and the ListView takes a long time to load. What can I do to speed this up? TIA David Try using the BeginUpdate/EndUpdate methods.  SignatureTim Wilson Device Application Development MVP >I am loading a ListView like this... > [quoted text clipped - 11 lines] > > David Also - try (in the loop) adding the new ListViewItem objects to a List<ListViewItem> - then at the end call .Items.AddRange(yourList.ToArray()); - this reduces the number of calls into the list view; supprounding this last call with BeginUpdate / EndUpdate may also help, but if you are only making one call I would expect it to handle that internally without painting each time... but best to be paranoid and use them anyway ;-p Marc hi David, please load your listview in load function of your control/Form. Use BeginUpdate /EndUpdate. Use of Double buffering in your list view might increase performance a little bit. if your listview contains large number of itmes then use Virtual Listview Mode. the main problem comes of flickering is also when the columns are resized. So better, hook its paint events in Wndproc. Hope this helps. :) James > I am loading a ListView like this... > [quoted text clipped - 11 lines] > > David Hi James, What is Virtual ListView Mode? I have read about a virtual ListView control. I have considered it - looks like I would have to write it in C++ and would require more time. Thanks. David > hi David, > please load your listview in load function of your control/Form. Use [quoted text clipped - 23 lines] >> >> David Thanks Everyone, for the suggestions... I am not necessarily wedded to the ListView. I need to do tests next week when I get some time. A ListBox would do, which I suspect would be lighter weight, and I could use data binding. Also, I am wondering if a DataGrid would be more optimized than the ListView. Any thoughts on the above? David >I am loading a ListView like this... > [quoted text clipped - 11 lines] > > David Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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