public static IEnumerable <Row> Where <T>(this IRelation relation, int column, Func <T, bool> predicate)
{
int i = 0;
foreach (T val in relation.ColumnData <T>(column))
{
if (predicate(val))
{
yield return(relation[i]);
}
i++;
}
}
public static IList ColumnData(this IRelation relation, string columnName)
{
int column = relation.Columns.IndexOf(new Column(columnName, null));
return(column >= 0 ? relation.ColumnData(column) : null);
}
