linq sum of multiple values - linq

Question

i need to get the sum of billableHours and nonBillableHours.
this is my code.
var currentMonth = 10;
var userQuery =
from timeEntry in TimeEntries
join ta in Tasks on timeEntry.TaskID equals ta.TaskID
where timeEntry.DateEntity.Month == currentMonth && timeEntry.DateEntity.Year == DateTime.Today.Year
select new
{
HoursEntered = timeEntry.HoursEntered,
Billable = ta.Billable
};
var localrows = userQuery.ToList();
var grouping = localrows.GroupBy(x => x.Billable);
var userList = grouping.Select(q => new
{
billableHours = q.Where(x=> x.Billable == true),
nonBillableHours = q.Where(x=> x.Billable != true)
});
i cannot seem to find a way to get the sum.
I need the sum of those two columns, so i can call them,
and calculate values i get from them.

Answer 1

When you need more than one aggregate, you can still get the result with a single query by using group by constant technique. Which in this specific case can be combined with conditional Sum:
var hoursInfo =
(from timeEntry in TimeEntries
join ta in Tasks on timeEntry.TaskID equals ta.TaskID
where timeEntry.DateEntity.Month == currentMonth && timeEntry.DateEntity.Year == DateTime.Today.Year
group new { timeEntry.HoursEntered, ta.Billable } by 1 into g
select new
{
BillableHours = g.Sum(e => e.Billable ? e.HoursEntered : 0),
NonBillableHours = g.Sum(e => !e.Billable ? e.HoursEntered : 0),
}).FirstOrDefault();

Answer 2

You do not need to group them. Try this query:
var userQuery =
from timeEntry in TimeEntries
join ta in Tasks on timeEntry.TaskID equals ta.TaskID
where timeEntry.DateEntity.Month == currentMonth
&& timeEntry.DateEntity.Year == DateTime.Today.Year
select new
{
HoursEntered = timeEntry.HoursEntered,
Billable = ta.Billable
};
var billableHours = userQuery
.Where(m => m.Billable) // Billable
.Select(m => m.HoursEntered)
.DefaultIfEmpty(0)
.Sum();
var nonBillableHours = userQuery
.Where(m => !m.Billable) // Non-bilable
.Select(m => m.HoursEntered)
.DefaultIfEmpty(0)
.Sum();

Answer 3

var currentMonth = 10;
var TimeEntries = new List<TimeEntry>() {
new TimeEntry(){TaskID = 1,DateEntity = DateTime.Now.AddDays(1),HoursEntered =2},
new TimeEntry(){TaskID = 2,DateEntity = DateTime.Now.AddDays(2),HoursEntered =3},
new TimeEntry(){TaskID = 3,DateEntity = DateTime.Now.AddDays(3),HoursEntered =2},
new TimeEntry(){TaskID = 4,DateEntity = DateTime.Now.AddDays(4),HoursEntered =4},
new TimeEntry(){TaskID = 5,DateEntity = DateTime.Now.AddDays(5),HoursEntered =2},
new TimeEntry(){TaskID = 6,DateEntity = DateTime.Now.AddDays(6),HoursEntered =6}
};
var UserTasks = new List<UserTask>(){
new UserTask(){TaskID = 1,Billable = true} ,
new UserTask(){TaskID = 2,Billable = false} ,
new UserTask(){TaskID = 3,Billable = true} ,
new UserTask(){TaskID = 4,Billable = false} ,
new UserTask(){TaskID = 5,Billable = true} ,
new UserTask(){TaskID = 6,Billable = false}
};
var userQuery =
from x in
(from timeEntry in TimeEntries
join ta in UserTasks on timeEntry.TaskID equals ta.TaskID
where timeEntry.DateEntity.Month == currentMonth && timeEntry.DateEntity.Year == DateTime.Today.Year
select new
{
HoursEntered = timeEntry.HoursEntered,
Billable = ta.Billable
})
group x by x.Billable into g
select new
{
IsBillable = g.Key,
Billabe = g.Where(t => t.Billable == true).Sum(x => x.HoursEntered),
NonBillable = g.Where(t => t.Billable == false).Sum(x => x.HoursEntered)
};
foreach (var item in userQuery.ToList())
{
Console.WriteLine(string.Format("{0} - {1}", item.IsBillable? "Billable":"Non-Billable",item.IsBillable?item.Billabe:item.NonBillable));
}