private void AddSort(LambdaExpression lambda, bool isStarting, bool ascending)
{
var body = lambda.Body as MemberExpression;
if (body == null)
{
throw new NotSupportedException($"The expression {lambda} cannot be used in an Order clause");
}
if (isStarting)
{
if (_optionalSortOrderHandle == null)
{
_optionalSortOrderHandle = _realm.MakeSortOrderForTable(_retType);
}
else
{
var badCall = ascending ? "By" : "ByDescending";
throw new NotSupportedException($"You can only use one OrderBy or OrderByDescending clause, subsequent sort conditions should be Then{badCall}");
}
}
var sortColName = body.Member.Name;
NativeSortOrder.add_sort_clause(_optionalSortOrderHandle, sortColName, (IntPtr)sortColName.Length, ascending ? (IntPtr)1 : IntPtr.Zero);
}