Original data sheet:
SQL that can get the result you want:
select group_number,count(group_number) as group_count,receive_date
from hS_HZXX
where type = '1'
group by group_number,receive_date;
use ef core linq like this:
var hAATGroups = from p in dbContext.Set<HS_HZXX>()
where p.type == "1"
group p by new { Group_number = p.group_number, Sampling_date = p.sampling_date } into dto
select new DTO_HAATGroup
{
Group_number = dto.Key.Group_number,
HAAT_count = dto.Key.Group_number.Count(),
Sampling_date = dto.Key.Sampling_date.ToString("yyyy-MM-dd")
};
The DTO_HAATGroup:
public class DTO_HAATGroup
{
public string Group_number { get; set; }
public int HAAT_count { set; get; }
public string Sampling_date { get; set; }
}
The result of executing linq:
But I got the wrong result. . . Can you help me? How can I convert this SQL into a correct Linq statement.
I have solved this problem, the correct Linq writing is as follows:
var hAATGroups = from p in dbContext.Set<HS_HZXX>()
where p.type == "1"
group p by new { Group_number = p.group_number, Receive_date = p.receive_date } into dto
select new DTO_HAATGroup
{
Group_number = dto.Key.Group_number,
HAAT_count = dto.Count(),
Receive_date = dto.Key.Receive_date.ToString("yyyy-MM-dd")
};
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