public void AppendSortBy(SortItem item)
{
var existing = _sortBy.FirstOrDefault(sb => sb.SortBy == item.SortBy);
if (existing != null)
{
_sortBy.Remove(existing);
}
if (item.Sequence == 1 && _sortBy.Exists(sb => sb.Sequence == 1))
{
item.Sequence = _sortBy.Max(sb => sb.Sequence) + 1;
}
_sortBy.Add(item);
}
public void ClearAndAddSortBy(SortItem item)
{
_sortBy.Clear();
AppendSortBy(item);
}