public static Query AddLastProjectionAlias(this Query query, string alias)
{
Argument.NotNull(query, "query");
Argument.NotWhiteSpace(alias, "alias");
var lastProjection = query.Select.InternalNodes.LastOrDefault();
if (lastProjection == null)
{
throw new InvalidOperationException("Query's select list is empty.");
}
var lastItem = lastProjection as ColumnProjection;
if (lastItem == null)
{
throw new InvalidOperationException("Unknown projection type.");
}
if (lastItem.Alias != null)
{
throw new InvalidOperationException("Last projection already has an alias.");
}
var newItem = new ColumnProjection(lastItem.Column, alias);
return(new Query(query.Select.ReplaceLast(newItem), query.From, query.Where));
}
protected internal virtual void VisitColumnProjection(ColumnProjection item)
{
}