Question

我想在晚上8点到早上6点之间获取记录。如何编写where子句，以便在晚上8点到早上6点之间获取记录。代码

  model = model.OrderByDescending(x => DateTime.Parse(x.UpdatedTime)).Where(x=>x.status=="UP").Take(100).ToList();

示例数据

1   39  6/28/2017 12:08:43 PM   UP
2   39  6/28/2017 12:04:18 PM   UP
3   39  6/28/2017 11:49:45 AM   UP

数据类型

public string UpdatedTime { get; set; }

控制器

 binModel.UpdatedTime = TimeZoneInfo.ConvertTimeFromUtc(item.timestamp, TimeZoneInfo.FindSystemTimeZoneById("India Standard Time")).ToString();

Answer 1

model = model.Where(x=> {
    var timeOfDay = DateTime.Parse(x.UpdatedTime).TimeOfDay; 
    return x.status=="UP" && 
        (timeOfDay.TotalHours >= 20 ||  timeOfDay.TotalHours < 6);
    })
    .OrderByDescending(x => DateTime.Parse(x.UpdatedTime)).Take(100).ToList();

应确认时间是在晚上8点或之后，早于早上6点。

Answer 2

检查DateTime.Hour超过晚上8点或更短时间

model = model.OrderByDescending(x => DateTime.Parse(x.UpdatedTime)).Where(x=>x.status=="UP" && (UpdatedTime.Hour > 20 || UpdatedTime.Hour < 6)).Take(100).ToList();

如何在实体框架中使用linq查询获取特定时间之间的记录

2 个答案: