Advanced LINQ/ Lambda Expression - vb.net

Question

I have this model:
Public Class Tbl_Exercise
<Key()> Public Property Exercise_ID() As Integer
Public Property Exercise_Employee_ID() As Integer
Public Property Exercise_Create_Date() As Date
<ForeignKey("Tbl_Exercise_Type")> _
Public Property Exercise_Type_ID() As Integer
Public Property Exercise_Duration() As Integer
Public Overridable Property Tbl_Exercise_Type As Tbl_Exercise_Type
End Class
I need to get the sum of the Exercise_Duration for each week of the year. I need to then check if the sum for the week is greater than or equal to 150. If it is, I need to +1 another variable (a count). The goal is to display this:
# of weeks you've reached 150: X out of Z
(Where X is the count of weeks greater than or equal to 150 and Z is equal to the total number of weeks in the current year.)
Final
' get number of weeks the exercise goal was reached (greater than or equal to the goal)
Dim exerciseDb = New ExerciseDbContext
Dim exercise = exerciseDb.Tbl_Exercises.Where(Function(x) x.Exercise_Employee_ID = empId)
Dim weeks = exercise.ToList.GroupBy(Function(x) CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(x.Exercise_Create_Date, CalendarWeekRule.FirstDay, DayOfWeek.Sunday))
Dim totalWeeks = 0
For Each week In weeks
Dim sum = week.Sum(Function(x) x.Exercise_Duration)
If sum > 150 Then
totalWeeks += 1
End If
Next
Debug.Print("over150: " + totalWeeks.ToString)

Answer 1

using System.Globalization;
DateTimeFormatInfo dfi = DateTimeFormatInfo.CurrentInfo;
Calendar cal = dfi.Calendar;
var recap =
(from e in exercises
group e by cal.GetWeekOfYear(e.Exercise_Create_Date,
dfi.CalendarWeekRule,
dfi.FirstDayOfWeek)
into g
select new
{
g.Key,
Total = g.Sum(x => x.Exercise_Duration)
}
into p
where p.Total > 150
select p)
.Count();

Answer 2

Here is an example in C#:
public class Exercise
{
public DateTime CreateDate { get; set; }
public int Duration { get; set; }
}
class Program
{
static void Main()
{
Exercise[] ex = new Exercise[]
{
new Exercise { CreateDate = DateTime.Parse("1/1/2012"), Duration = 160 },
new Exercise { CreateDate = DateTime.Parse("1/8/2012"), Duration = 160 },
new Exercise { CreateDate = DateTime.Parse("1/15/2012"), Duration = 160 },
new Exercise { CreateDate = DateTime.Parse("2/1/2012"), Duration = 100 },
new Exercise { CreateDate = DateTime.Parse("3/1/2012"), Duration = 75 },
new Exercise { CreateDate = DateTime.Parse("3/1/2012"), Duration = 80 }
};
var weeks = ex.GroupBy(x => CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(x.CreateDate, CalendarWeekRule.FirstDay, DayOfWeek.Sunday));
int currentweek = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(DateTime.Now, CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
int over150 = weeks.Where(group => group.Sum(item => item.Duration) > 150).Count();
Console.WriteLine(String.Format("# of weeks you've reached 150: {0} out of {1}", over150, currentweek));
}
}