public void SetSortIcon(int columnIndex, SortOrder order)
{
IntPtr columnHeader = SendMessage(Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
for (int columnNumber = 0; columnNumber <= Columns.Count - 1; columnNumber++)
{
IntPtr columnPtr = new IntPtr(columnNumber);
LvÑolumn lvColumn = new LvÑolumn();
lvColumn.mask = HDI_FORMAT;
SendMessageLVCOLUMN(columnHeader, HDM_GETITEM, columnPtr, ref lvColumn);
if (order != SortOrder.None && columnNumber == columnIndex)
{
switch (order)
{
case SortOrder.Ascending:
lvColumn.fmt &= ~HDF_SORTDOWN;
lvColumn.fmt |= HDF_SORTUP;
break;
case SortOrder.Descending:
lvColumn.fmt &= ~HDF_SORTUP;
lvColumn.fmt |= HDF_SORTDOWN;
break;
}
}
else
{
lvColumn.fmt &= ~HDF_SORTDOWN & ~HDF_SORTUP;
}
SendMessageLVCOLUMN(columnHeader, HDM_SETITEM, columnPtr, ref lvColumn);
}
}
private static extern IntPtr SendMessageLVCOLUMN(IntPtr hWnd, Int32 msg, IntPtr wParam, ref LvÑolumn lPlvColumn);
