/// <summary>
/// 指定属性名，按升序对序列中的元素执行后续排序。
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="query"></param>
/// <param name="ordering"><see cref="Ordering"/></param>
/// <returns></returns>
public static IOrderedQueryable <T> ThenBy <T>(this IOrderedQueryable <T> query, Ordering ordering)
{
if (ordering == null)
{
throw new ArgumentNullException(nameof(ordering));
}
string methodName = ordering.Dir == Direction.Asc ? "ThenBy" : "ThenByDescending";
return(CallOrderedQueryable(query, methodName, ordering.Name, null));
}
/// <summary>
/// 克隆构造函数
/// </summary>
/// <param name="ordering"></param>
public Ordering(Ordering ordering)
{
Name = ordering.Name;
Dir = ordering.Dir;
}