/// <summary>
/// 返回增值（%）
/// </summary>
/// <param name="interval"></param>
/// <returns></returns>
public override double?GetIncrease(int days)
{
DateTime time = LastDay.AddDays(-days);
DateTime realTime = time;
int addDays = -1;
while (!HistoryDic.Keys.Contains(realTime))
{
realTime = time.AddDays(addDays);
addDays = addDays < 0 ? -addDays : -addDays - 1;
if (addDays > 30)
{
return(null); //超过范围 返回空
}
}
double?value = HistoryDic[LastDay];
double?hisValue = HistoryDic[realTime];
if (days < 5)
{
hisValue = HistoryDic.Values.Take(days + 1).Last(); // 五天内按连续天数取
}
double?result = 100 * (value - hisValue) / hisValue;
return(Math.Round((double)result, 2));
}
