要从表中获取仅适用于今天（或特定日期范围）的行，只需执行此操作即可。这种方法的好处是，它适用于特定日期或日期范围的两种情况。
// specify date range (without time)
DateTime currentDate = System.DateTime.Now.Date;
DateTime nextDate = currentDate.AddDays(1);
var second_data = from b in this.database.table
where b.timeStamp.Value >= currentDate
and b.timeStamp.Value < nextDate
select b;
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