how to add the number of items at the end of the linq query - linq

Question

i have the following LINQ
public IEnumerable<TurbineStatus> turStatus()
{
var result = (from s in _db.masterData
group s by s.current_turbine_status into g
select new TurbineStatus
{
status = g.Key,
numberOfTurbines = g.Count()
}
).ToList().OrderByDescending(s => s.status);
return result;
}
my class:
public class TurbineStatus
{
public string status { get; set; }
public int numberOfTurbines { get; set; }
public int allTurbines { get; set; }
}
i gives me the number of turbines according to the status,for example, 5turbines STOP,6 turbines RUN,10 turbines Link Down and so on,i also need to have sum of all these statuses,in my TurbinesStatus class i have a field which is int and named it allTurbines,how can i achieve it?

Answer 1

It's probably better for performance reasons to let the DB handle sorting and then once the result is materialized, you can extract the sum of the turbines count:
var result =
(
from s in _db.masterData
group s by s.current_turbine_status into g
select new TurbineStatus
{
status = g.Key,
numberOfTurbines = g.Count()
} into statusGroup
orderby statusGroup.status descending
select statusGroup
).ToList();
int totalTurbines = groups.Sum(statusGroup => statusGroup.numberOfTurbines);
To return both as a TurbinesStatus instance:
public class TurbinesStatus
{
public IReadOnlyList<TurbineStatus> TurbineStatuses { get; }
public int TotalCount { get; }
public TurbinesStatus(IReadOnlyList<TurbineStatus> turbineStatuses)
{
TurbineStatuses = turbineStatuses;
TotalCount = turbineStatuses.Sum(ts => ts.numberOfTurbines);
}
}
and then
public TurbinesStatus turStatus()
{
var statuses =
(
from s in _db.masterData
group s by s.current_turbine_status into g
select new TurbineStatus
{
status = g.Key,
numberOfTurbines = g.Count()
} into statusGroup
orderby statusGroup.status descending
).ToList();
return new TurbinesStatus(statuses);
}