public static extern IntPtr SendMessage(IntPtr hWnd, MSG Msg, int wParam, ref HDITEM lParam);
/// <summary>
/// This is only to be used in SetSortCollumn(...)
/// </summary>
/// <param name="columnIndex"></param>
/// <param name="order"></param>
private void SetSortIcon(Int32 columnIndex, SortOrder order) {
IntPtr columnHeader = User32.SendMessage(this.LVHandle, MSG.LVM_GETHEADER, 0, 0);
for (Int32 columnNumber = 0; columnNumber <= this.Collumns.Count - 1; columnNumber++) {
var item = new HDITEM { mask = HDITEM.Mask.Format };
if (User32.SendMessage(columnHeader, MSG.HDM_GETITEM, columnNumber, ref item) == IntPtr.Zero) {
throw new Win32Exception();
}
if (order != SortOrder.None && columnNumber == columnIndex) {
switch (order) {
case SortOrder.Ascending:
item.fmt &= ~HDITEM.Format.SortDown;
item.fmt |= HDITEM.Format.SortUp;
break;
case SortOrder.Descending:
item.fmt &= ~HDITEM.Format.SortUp;
item.fmt |= HDITEM.Format.SortDown;
break;
}
} else {
item.fmt &= ~HDITEM.Format.SortDown & ~HDITEM.Format.SortUp;
}
if (User32.SendMessage(columnHeader, MSG.HDM_SETITEM, columnNumber, ref item) == IntPtr.Zero) {
throw new Win32Exception();
}
}
}