virtualmode

How do I populate a ListView in virtual mode asynchronously?

由 烂漫一生 提交于 2019-12-29 07:57:12
问题 I'd like to display records from our database in a listview - but retrieves can take a long time. I can use RetrieveVirtualItem to tell me when a new ListViewItem is needed, add a dummy item, and start a retrieve; but what do I do with the record when the database returns it? I can't update the ListView's Items collection while the ListView is in VirtualMode. Is there a way to tell the ListView to reload an item? Or can I just keep a reference to the ListViewItem and populate that? If neither

How-to use FindItemWithText?

由 冷暖自知 提交于 2019-12-25 01:24:51
问题 Below is the code I am working with. My accounts are stored in a Dictionary(Of String, Integer) so that I can easily associate a value with them. My listview is working great after I converted it to virtualmode but I lost the functionality to search simply by typing in the listview which is what I would like to get back. Without it this makes the whole feature practically useless unless I can search by name. I have searched and implemented multiple examples and I cannot get anything to work.

C# DataGridView virtual mode: Enable sorting

由 99封情书 提交于 2019-12-23 14:21:14
问题 Is there a way to sort a DataGridView in virtual mode? I have implemented a Gridview in virtual mode following this microsoft example: http://msdn.microsoft.com/de-de/library/ms171624.aspx . Also I have modified the example to be able to write data to database. This works out fine and the virtual mode gives a huge increase in speed, but my customer needs to sort the columns. After searching the web for a while I found the Link http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols

Is WinForms ListView in VirtualMode limited to 100,000,000 rows?

由 我与影子孤独终老i 提交于 2019-12-19 11:33:08
问题 I have some grid scenario with > 500,000,000 rows I would like to display in ListView. If I artificially limit my ListView to display 100,000,000: _listView.VirtualListSize = _data.Count; if (_listView.VirtualListSize > 100000000) _listView.VirtualListSize = 100000000; Everything works fine (In VirtualMode naturally). When I change my code to: _listView.VirtualListSize = _data.Count; if (_listView.VirtualListSize > 100000001) _listView.VirtualListSize = 100000001; The ListView display an

Check if selected item is visible [virtual ListView in details view]

由 牧云@^-^@ 提交于 2019-12-12 05:13:50
问题 Is there any good/short solution to the subj? I can think of: get TopItem index (in VirtualMode can it be null before item is created?), if index of needed item is less, then it is invisible, otherwise get bottom visible index (top index + listView.ClientSize.Height / GetItemRect(TopItem).Height ) and if index of needed item is more, then it is invisible. Otherwise visible. detect scrolling somehow and do something. Or maybe there is an easier way? 回答1: listView1.Items[SelectedItemIndex]

Cannot access the selected items collection when the ListView is in virtual mode?

由 寵の児 提交于 2019-12-09 00:43:06
问题 I have a ListView in Virtual Mode. I wanna to access SelectedItems property. But when I use ListView1.SelectedItems , I receive the following Exception : Cannot access the selected items collection when the ListView is in virtual mode How can I access to ListView1.SelectedItems in VirtualMode. 回答1: It is quite old post but maybe someone else will benefit. Simply use ListView.SelectedIndexCollection col = listView.SelectedIndices; Then you can access an item: forearch(var item in col) { string

DataGridView, Virtual Mode and “lags”

由 微笑、不失礼 提交于 2019-12-02 05:00:42
问题 My code looks as follows: private void dataGridView4_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e) { Records recordsTmp = null; recordsTmp = (Records)this.ArrayOfRecords[e.RowIndex]; //ArrayList with string[] objects inside switch (dataGridView4.Columns[e.ColumnIndex].HeaderText) { case "#": e.Value = recordsTmp.nr; break; case "ip": e.Value = recordsTmp.Ip; break; case "long": e.Value = recordsTmp.Long; break; case "3": e.Value = recordsTmp.type; break; case "4": e.Value =

Is WinForms ListView in VirtualMode limited to 100,000,000 rows?

由 空扰寡人 提交于 2019-12-01 13:12:50
I have some grid scenario with > 500,000,000 rows I would like to display in ListView. If I artificially limit my ListView to display 100,000,000: _listView.VirtualListSize = _data.Count; if (_listView.VirtualListSize > 100000000) _listView.VirtualListSize = 100000000; Everything works fine (In VirtualMode naturally). When I change my code to: _listView.VirtualListSize = _data.Count; if (_listView.VirtualListSize > 100000001) _listView.VirtualListSize = 100000001; The ListView display an empty grid... Is this a Microsoft Bug? Where is this coming from? Is this a Win32 ListView limitation? Most

Virtual Listview for ASP.net?

由 岁酱吖の 提交于 2019-12-01 08:27:33
问题 Is there a virtual listview for ASP.net? Most tables (and grids, listview, data tables, data grids, grid views, list grids) i find for asp.net expect the user to page through data. i want a listview that contains, for example, 10,000 items; and i don't want 10 pages. The problem of a long list was solved in 1994 using a listview in "virtual" mode. The control need only be given the number of items to show. The control information about those items as required (i.e. as the user scrolls them

implementing virtual mode for a datagridview that is databound

由 不羁岁月 提交于 2019-12-01 08:10:10
A general question for advice on the implementation. I've got a collection bound to a datagridview . BindingList<Line> allLines = new BindingList<Line>(); dataGridView1.DataSource = allLines; I want to implement virtual mode because the collection could contain millions of entries ( Line objects) so I thought it may be quicker to only 'cache' or display a few entries that are needed at a time. Which is what I understand virtual mode to be for? I've looked at: http://msdn.microsoft.com/en-us/library/2b177d6d.aspx But I can't get it to work for a datagridview that is databound . I can't specify
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