private void AddSort(LambdaExpression lambda, bool isStarting, bool ascending)
{
var body = lambda.Body as MemberExpression;
if (body == null)
{
throw new NotSupportedException($"The expression {lambda} cannot be used in an Order clause");
}
if (isStarting)
{
if (OptionalSortDescriptorBuilder == null)
{
OptionalSortDescriptorBuilder = _realm.CreateSortDescriptorForTable(_metadata);
}
else
{
var badCall = ascending ? "ThenBy" : "ThenByDescending";
throw new NotSupportedException($"You can only use one OrderBy or OrderByDescending clause, subsequent sort conditions should be {badCall}");
}
}
var sortColName = body.Member.Name;
OptionalSortDescriptorBuilder.AddClause(sortColName, ascending);
}
