LINQ Group By multiple columns and also count
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I have the following LINQ code in my .NET Core application. I am using EF Core with Pomelo as driver for MySQL.
var journeyId = 5917;
var journey = Journeys.FirstOrDefault(j => j.JourneyId == journeyId);
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.ToList().Count()
};
journey.JourneyEvents = journeyEvents.ToList();
When the code tries to run the last line, I get the following exception.
Could not parse expression 'g.ToList()': This overload of the method 'System.Linq.Enumerable.ToList' is currently not supported.
What am I missing?
c# mysql linq pomelo
asked Nov 22 at 15:32
J86
4,6172282148
add a comment |
up vote
0
down vote
favorite
I have the following LINQ code in my .NET Core application. I am using EF Core with Pomelo as driver for MySQL.
var journeyId = 5917;
var journey = Journeys.FirstOrDefault(j => j.JourneyId == journeyId);
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.ToList().Count()
};
journey.JourneyEvents = journeyEvents.ToList();
When the code tries to run the last line, I get the following exception.
Could not parse expression 'g.ToList()': This overload of the method 'System.Linq.Enumerable.ToList' is currently not supported.
What am I missing?
c# mysql linq pomelo
asked Nov 22 at 15:32
J86
4,6172282148
did you debug to see what type is journeyEvents?
– Juan Carlos Oropeza
Nov 22 at 15:36
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have the following LINQ code in my .NET Core application. I am using EF Core with Pomelo as driver for MySQL.
var journeyId = 5917;
var journey = Journeys.FirstOrDefault(j => j.JourneyId == journeyId);
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.ToList().Count()
};
journey.JourneyEvents = journeyEvents.ToList();
When the code tries to run the last line, I get the following exception.
Could not parse expression 'g.ToList()': This overload of the method 'System.Linq.Enumerable.ToList' is currently not supported.
What am I missing?
c# mysql linq pomelo
asked Nov 22 at 15:32
J86
4,6172282148
I have the following LINQ code in my .NET Core application. I am using EF Core with Pomelo as driver for MySQL.
var journeyId = 5917;
var journey = Journeys.FirstOrDefault(j => j.JourneyId == journeyId);
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.ToList().Count()
};
journey.JourneyEvents = journeyEvents.ToList();
When the code tries to run the last line, I get the following exception.
Could not parse expression 'g.ToList()': This overload of the method 'System.Linq.Enumerable.ToList' is currently not supported.
What am I missing?
c# mysql linq pomelo
c# mysql linq pomelo
asked Nov 22 at 15:32
J86
4,6172282148
asked Nov 22 at 15:32
J86
4,6172282148
asked Nov 22 at 15:32
J86
4,6172282148
asked Nov 22 at 15:32
J86
4,6172282148
asked Nov 22 at 15:32
J86
4,6172282148
4,6172282148
did you debug to see what type is journeyEvents?
– Juan Carlos Oropeza
Nov 22 at 15:36
add a comment |
did you debug to see what type is journeyEvents?
– Juan Carlos Oropeza
Nov 22 at 15:36
did you debug to see what type is journeyEvents?
– Juan Carlos Oropeza
Nov 22 at 15:36
did you debug to see what type is journeyEvents?
– Juan Carlos Oropeza
Nov 22 at 15:36
add a comment |
2 Answers
2
active
oldest
votes
up vote
2
down vote
accepted
Use g.Count() instead g.ToList().Count().
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.Count()
};
journey.JourneyEvents = journeyEvents.ToList();
answered Nov 22 at 16:32
gpaoli
8591122
add a comment |
up vote
0
down vote
I think you should use here SelectToMany:
g.SelectToMany(gr => gr).ToList().Count()
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
accepted
Use g.Count() instead g.ToList().Count().
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.Count()
};
journey.JourneyEvents = journeyEvents.ToList();
answered Nov 22 at 16:32
gpaoli
8591122
add a comment |
up vote
2
down vote
accepted
Use g.Count() instead g.ToList().Count().
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.Count()
};
journey.JourneyEvents = journeyEvents.ToList();
answered Nov 22 at 16:32
gpaoli
8591122
add a comment |
up vote
2
down vote
accepted
up vote
2
down vote
accepted
Use g.Count() instead g.ToList().Count().
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.Count()
};
journey.JourneyEvents = journeyEvents.ToList();
answered Nov 22 at 16:32
gpaoli
8591122
Use g.Count() instead g.ToList().Count().
var journeyEvents = from ad in AccelerometerData
join ae in AccelerometerEvents on ad.AccelerometerDataId equals ae
.AccelerometerData.AccelerometerDataId
where ad.Device.DeviceId == journey.Device.DeviceId && ae.TimeStamp >= journey.StartDateTime &&
ae.TimeStamp <= journey.EndDateTime
group ae by new
{
ae.EventType,
ae.Level
} into g
select new
{
EventType = new JourneyEventType { JourneyEventTypeId = g.Key.EventType },
Level = g.Key.Level,
Count = g.Count()
};
journey.JourneyEvents = journeyEvents.ToList();
answered Nov 22 at 16:32
gpaoli
8591122
answered Nov 22 at 16:32
gpaoli
8591122
answered Nov 22 at 16:32
gpaoli
8591122
answered Nov 22 at 16:32
gpaoli
8591122
8591122
add a comment |
add a comment |
up vote
0
down vote
I think you should use here SelectToMany:
g.SelectToMany(gr => gr).ToList().Count()
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
add a comment |
up vote
0
down vote
I think you should use here SelectToMany:
g.SelectToMany(gr => gr).ToList().Count()
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
add a comment |
up vote
0
down vote
up vote
0
down vote
I think you should use here SelectToMany:
g.SelectToMany(gr => gr).ToList().Count()
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
I think you should use here SelectToMany:
g.SelectToMany(gr => gr).ToList().Count()
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
answered Nov 22 at 17:40
Vladimir Kniazkov
1573
1573
add a comment |
add a comment |
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did you debug to see what type is journeyEvents?
– Juan Carlos Oropeza
Nov 22 at 15:36