Does ListViewColumnSorter cause performance issues when adding listView items in C #?

Question

For some time, I had difficulties with one of mine ListView'sfilling up very slowly (3,000 records in 15 seconds or so (with 5 columns). This drove me crazy, as the sql query returned values ​​less than secondly, I tracked this to ListViewColumnSorterbeing a slowdown.When I commented:

private ListViewColumnSorter lvwColumnSorterKontrahenci = new ListViewColumnSorter();
listViewKontrahenci.ListViewItemSorter = lvwColumnSorterKontrahenci;

ListViewsettled for 1 second. I always thought that when I attach a column sorter, it starts its work, when I actually execute it by clicking on the column heading.

 private void listViewKontrahenci_ColumnClick(object sender, ColumnClickEventArgs e) {
        ListViewColumnSorter.columnClick(listViewKontrahenci, ref lvwColumnSorterKontrahenci, sender, e, headerIcons);
}

I thought that until I started at least once, that would not be a problem.

Code to sort the list:

    public static void columnClick(ListView varListView, ref ListViewColumnSorter lvwColumnSorter, object sender, ColumnClickEventArgs e, ImageList headerImages) {
        //get list view header
        IntPtr hHeader = SendMessage(varListView.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
        SendMessage(hHeader, HDM_SETIMAGELIST, IntPtr.Zero, headerImages.Handle);
        SortOrder Order = SortOrder.Descending;
        //format icons
        HDITEM hd = new HDITEM {
                                   mask = HDI_IMAGE | HDI_FORMAT
                               };
        for (int i = 0; i < varListView.Columns.Count; i++) {
            //    if (i != e.Column) {
            hd.fmt = HDF_LEFT | HDF_STRING;
            hd.iImage = -1;
            SendMessage(hHeader, HDM_SETITEM, new IntPtr(i), ref hd);
            //    }
        }
        hd.fmt = HDF_LEFT | HDF_STRING | HDF_BITMAP_ON_RIGHT;
        //ListViewHelper.enableDoubleBuffer(varListView);
        if (Order != SortOrder.None) {
            hd.fmt |= HDF_IMAGE;
        }
        if (e.Column == lvwColumnSorter.SortColumn) {
            if (lvwColumnSorter.Order == SortOrder.Ascending) {
                hd.iImage = 0;
                lvwColumnSorter.Order = SortOrder.Descending;
            } else {
                hd.iImage = 1;
                lvwColumnSorter.Order = SortOrder.Ascending;
            }
        } else {
            hd.iImage = 1;
            lvwColumnSorter.SortColumn = e.Column;
            lvwColumnSorter.Order = SortOrder.Ascending;
        }
        SendMessage(hHeader, HDM_SETITEM, new IntPtr(e.Column), ref hd);
        varListView.Sort();
    }

? / , ListView, ?

Answer 1

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