// Return a string representing this item's sub-item.
private string ItemString(ListViewItem listview_item, int idx)
{
ListViewEx slvw = ( ListViewEx )listview_item.ListView;
// Make sure the item has the needed sub-item.
string value = "";
if (idx <= listview_item.SubItems.Count - 1)
{
value = listview_item.SubItems[idx].Text;
}
// Return the sub-item's value.
if (slvw.Columns[idx].TextAlign == HorizontalAlignment.Right)
{
// Pad so numeric values sort properly.
return(value.PadLeft(20));
}
else
{
return(value);
}
}
// Compare two ListViewItems.
public int Compare(object x, object y)
{
ListViewItem itemx = ( ListViewItem )(x);
ListViewItem itemy = ( ListViewItem )(y);
// Get the selected column index.
ListViewEx slvw = ( ListViewEx )itemx.ListView;
int idx = slvw.SelectedSortColumn;
if (idx < 0)
{
return(0);
}
// Compare the items' strings.
if (itemx.ListView.Sorting == SortOrder.Ascending)
{
return(String.Compare(ItemString(itemx, idx), ItemString(itemy, idx)));
}
else
{
return(-String.Compare(ItemString(itemx, idx), ItemString(itemy, idx)));
}
}
// Return a string representing this item as a
// null-separated list of the item sub-item values.
private string ItemString(ListViewItem listview_item)
{
ListViewEx slvw = ( ListViewEx )listview_item.ListView;
// Make sure we have the sort sub-items' order.
if (slvw._sortSubitems == null)
{
slvw.SetSortSubitems( );
}
// Make an array to hold the sort sub-items' values.
int num_cols = slvw.Columns.Count;
string[] values = new string[num_cols];
// Build the list of fields in display order.
for (int i = 0; i <= slvw._sortSubitems.Length - 1; i++)
{
int idx = slvw._sortSubitems[i];
// Get this sub-item's value.
string item_value = "";
if (idx < listview_item.SubItems.Count)
{
item_value = listview_item.SubItems[idx].Text;
}
// Align appropriately.
if (slvw.Columns[idx].TextAlign == HorizontalAlignment.Right)
{
// Pad so numeric values sort properly.
values[i] = item_value.PadLeft(20);
}
else
{
values[i] = item_value;
}
}
// Save the sub-item values in display order.
for (int i = 0; i <= slvw._sortSubitems.Length - 1; i++)
{
int idx = slvw._sortSubitems[i];
// Make sure this item has this sub-item.
if (idx < listview_item.SubItems.Count)
{
// Add the sub-item's value.
if (slvw.Columns[idx].TextAlign == HorizontalAlignment.Right)
{
// Pad so numeric values sort properly.
values[i] = listview_item.SubItems[idx].Text.PadLeft(20);
}
else
{
values[i] = listview_item.SubItems[idx].Text;
}
}
}
// Console.WriteLine(String.Join("|", values));
// Concatenate the values to build the result.
return(String.Join("\0", values));
}