/// <summary>
/// 将列号转换为文本形式
/// </summary>
/// <param name="column">待转换的列号，从0开始</param>
/// <returns>列号对应的A1格式地址</returns>
internal static string ColumnToText(int column)
{
ExceptionIntervalOut.Check(0, null, column);
const int begin = 'A';
return(ToolBit.FromDecimal(column, 26).Integer.PackIndex(true).
Select(x => (char)(begin + (x.Index == 0 && x.Count > 1 ? x.Elements - 1 : x.Elements))).Join());
}
/// <summary>
/// 枚举一个枚举的所有位域，
/// 即便该枚举没有<see cref="FlagsAttribute"/>特性，也不受影响
/// </summary>
/// <typeparam name="Obj">待返回位域的枚举类型</typeparam>
/// <param name="obj">待返回位域的枚举</param>
/// <returns></returns>
public static IEnumerable <Obj> AllFlag <Obj>(this Obj obj)
where Obj : Enum
=> ToolBit.AllFlag(obj.To <int>(), 31).
Select(x => (Obj)Enum.ToObject(typeof(Obj), x.Power));
static IEnumerable <int> Flag(int Num, int MaxIndex) => ToolBit.AllFlag(Num, MaxIndex).Select(x => x.Index);
