C# LINQ将基于标志向JSON添加连续记录

我有一个实体有一套记录

public class Employee
{
    public int EmpID { get; set; }
    public DateTime EntryTime { get; set; }
    public DateTime ExitTime { get; set; }
    public bool CheckFlag { get; set; }
}   

var employees = new List<Employee>();
employees.Add(new Employee() { EmpID = 1, EntryTime = new DateTime(2020, 02, 16, 1, 0, 0), ExitTime = new DateTime(2020, 02, 16, 2, 15, 0), CheckFlag = true });
employees.Add(new Employee() { EmpID = 2, EntryTime = new DateTime(2020, 02, 16, 4, 50, 0), ExitTime = new DateTime(2020, 02, 16, 5, 15, 0), CheckFlag = false });
employees.Add(new Employee() { EmpID = 1, EntryTime = new DateTime(2020, 02, 16, 3, 35, 0), ExitTime = new DateTime(2020, 02, 16, 3, 45, 0), CheckFlag = false });
employees.Add(new Employee() { EmpID = 1, EntryTime = new DateTime(2020, 02, 16, 3, 20, 0), ExitTime = new DateTime(2020, 02, 16, 3, 30, 0), CheckFlag = false });
employees.Add(new Employee() { EmpID = 2, EntryTime = new DateTime(2020, 02, 16, 3, 30, 0), ExitTime = new DateTime(2020, 02, 16, 4, 45, 0), CheckFlag = false });
employees.Add(new Employee() { EmpID = 2, EntryTime = new DateTime(2020, 02, 16, 2, 30, 0), ExitTime = new DateTime(2020, 02, 16, 3, 15, 0), CheckFlag = true });
employees.Add(new Employee() { EmpID = 2, EntryTime = new DateTime(2020, 02, 16, 1, 45, 0), ExitTime = new DateTime(2020, 02, 16, 2, 15, 0), CheckFlag = false });

我尝试的（foreach group by和order by）

公共类跟踪记录
{
公共int EmpID{get；set；}
公共列表轨迹时间{get；set；}
}
公共类轨道时间
{
公共日期时间开始时间{get；set；}
公共日期时间结束时间{get；set；}
}
var trackRecord=新列表（）；
var trackTimes=新列表（）；
bool checkflag=true；
int-prevEmpId=0；
foreach（var结果为employees.GroupBy（x=>x.EmpID））
{
如果（！checkflag&&trackTimes.Count>0）
{
添加（新的trackRecord（）
{
EmpID=前EmpID，
轨道时间=轨道时间
});
checkflag=true；
trackTimes=新列表（）；
}
foreach（result.OrderBy中的var employee（x=>x.EntryTime））
{
if（employee.CheckFlag）
{
如果（！checkflag&&trackTimes.Count>0）
{
添加（新的trackRecord（）
{
EmpID=employee.EmpID，
轨道时间=轨道时间
});
checkflag=true；
trackTimes=新列表（）；
}
添加（新的trackRecord（）
{
EmpID=employee.EmpID，
TrackTimes=new List（）{new TrackTime（）{StartTime=employee.EntryTime，EndTime=employee.ExitTime}
});                        
}
其他的
{
Add（new TrackTime（）{StartTime=employee.EntryTime，EndTime=employee.ExitTime}）；
checkflag=false；
}
}
prevEmpId=result.Key；
}
如果（！checkflag&&trackTimes.Count>0）
{
添加（新的trackRecord（）
{
EmpID=前EmpID，
轨道时间=轨道时间
});
checkflag=true；
trackTimes=新列表（）；
}
WriteLine（JsonConvert.SerializeObject（trackRecord））；

为了方便起见，让我们将

员工的
日期时间
属性移动到已定义的
跟踪时间
类中，如下所示：

public class Employee
{
    public int EmpID { get; set; }
    public TrackTime TrackTime { get; set; }
    public bool CheckFlag { get; set; }
} 

那么你的Linq应该是：

var records = employees
  .GroupBy(e => new { e.EmpID, e.CheckFlag })
  .SelectMany(g =>
     g.Key.CheckFlag ?
     g.Select(e => new List<Employee> { e }).ToList() :
     new List<List<Employee>> { g.ToList() })
  .Select(es => new TrackRecord
  {
      EmpID = es.First().EmpID,
      TrackTimes = es.Select(e => e.TrackTime).ToList()
  })
  .OrderBy(e => e.EmpID)
  .ThenBy(e => e.TrackTimes.First().EntryTime)
  .ToList();

如果按
CheckFlag
分组，则将有两个组，分别为
true
或
false
。您有两个
CheckFlag
等于
true
的项。您是如何获得单个结果的？请分享您的
foreach
循环代码，以及您是如何获得预期结果的result@PavelAnikhouski，添加了foreach代码。您是按
EmpID
对项目进行分组，而不是按
CheckFlag
property@KrishnaMuppalla，当存在两个不同的
EmpId
s时，是否可以添加预期输出，例如，使用值1和2？
public class Employee
{
    public int EmpID { get; set; }
    public TrackTime TrackTime { get; set; }
    public bool CheckFlag { get; set; }
} 

var records = employees
  .GroupBy(e => new { e.EmpID, e.CheckFlag })
  .SelectMany(g =>
     g.Key.CheckFlag ?
     g.Select(e => new List<Employee> { e }).ToList() :
     new List<List<Employee>> { g.ToList() })
  .Select(es => new TrackRecord
  {
      EmpID = es.First().EmpID,
      TrackTimes = es.Select(e => e.TrackTime).ToList()
  })
  .OrderBy(e => e.EmpID)
  .ThenBy(e => e.TrackTimes.First().EntryTime)
  .ToList();

var employees = new List<Employee>();
employees.Add(new Employee() { EmpID = 1, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 1, 0, 0), ExitTime = new DateTime(2020, 02, 16, 2, 15, 0) }, CheckFlag = true });
employees.Add(new Employee() { EmpID = 1, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 3, 15, 0), ExitTime = new DateTime(2020, 02, 16, 3, 30, 0) }, CheckFlag = false });
employees.Add(new Employee() { EmpID = 1, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 3, 30, 0), ExitTime = new DateTime(2020, 02, 16, 3, 45, 0) }, CheckFlag = false });
employees.Add(new Employee() { EmpID = 1, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 3, 45, 0), ExitTime = new DateTime(2020, 02, 16, 4, 15, 0) }, CheckFlag = false });
employees.Add(new Employee() { EmpID = 1, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 4, 30, 0), ExitTime = new DateTime(2020, 02, 16, 5, 15, 0) }, CheckFlag = true });
employees.Add(new Employee() { EmpID = 2, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 1, 0, 0), ExitTime = new DateTime(2020, 02, 16, 2, 15, 0) }, CheckFlag = true });
employees.Add(new Employee() { EmpID = 2, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 3, 15, 0), ExitTime = new DateTime(2020, 02, 16, 3, 30, 0) }, CheckFlag = false });
employees.Add(new Employee() { EmpID = 2, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 3, 30, 0), ExitTime = new DateTime(2020, 02, 16, 3, 45, 0) }, CheckFlag = false });
employees.Add(new Employee() { EmpID = 2, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 3, 45, 0), ExitTime = new DateTime(2020, 02, 16, 4, 15, 0) }, CheckFlag = false });
employees.Add(new Employee() { EmpID = 2, TrackTime = new TrackTime { EntryTime = new DateTime(2020, 02, 16, 4, 30, 0), ExitTime = new DateTime(2020, 02, 16, 5, 15, 0) }, CheckFlag = true });

[
  {
    "EmpID  ": 1,
    "TrackTimes  ": [
      {
        "EntryTime  ": "2020-02-16T01:00:00  ",
        "ExitTime  ": "2020-02-16T02:15:00  "
      }
    ]
  },
  {
    "EmpID  ": 1,
    "TrackTimes  ": [
      {
        "EntryTime  ": "2020-02-16T03:15:00  ",
        "ExitTime  ": "2020-02-16T03:30:00  "
      },
      {
        "EntryTime  ": "2020-02-16T03:30:00  ",
        "ExitTime  ": "2020-02-16T03:45:00  "
      },
      {
        "EntryTime  ": "2020-02-16T03:45:00  ",
        "ExitTime  ": "2020-02-16T04:15:00  "
      }
    ]
  },
  {
    "EmpID  ": 1,
    "TrackTimes  ": [
      {
        "EntryTime  ": "2020-02-16T04:30:00  ",
        "ExitTime  ": "2020-02-16T05:15:00  "
      }
    ]
  },
  {
    "EmpID  ": 2,
    "TrackTimes  ": [
      {
        "EntryTime  ": "2020-02-16T01:00:00  ",
        "ExitTime  ": "2020-02-16T02:15:00  "
      }
    ]
  },
  {
    "EmpID  ": 2,
    "TrackTimes  ": [
      {
        "EntryTime  ": "2020-02-16T03:15:00  ",
        "ExitTime  ": "2020-02-16T03:30:00  "
      },
      {
        "EntryTime  ": "2020-02-16T03:30:00  ",
        "ExitTime  ": "2020-02-16T03:45:00  "
      },
      {
        "EntryTime  ": "2020-02-16T03:45:00  ",
        "ExitTime  ": "2020-02-16T04:15:00  "
      }
    ]
  },
  {
    "EmpID  ": 2,
    "TrackTimes  ": [
      {
        "EntryTime  ": "2020-02-16T04:30:00  ",
        "ExitTime  ": "2020-02-16T05:15:00  "
      }
    ]
  }
]