根据提示用什么方法完成排列
///
/// 子元素顺序类型.Combination-(A,(B|C|D)):A为首个,其它任意或DisOrder-表示没有顺序,任意
///
public SubElementType SubTypeType = SubElementType.AscOrder;
这是枚举
http://www.cnblogs.com/linjiqin/archive/2011/02/11/1951632.html
public enum SubElementType { AscOrder, DscOrder }
public SubElementType SubTypeType = SubElementType.AscOrder;