linqtosql, timespan, aggregates ... can it be done?

Question

Can this be done w/ linqtosql?

SELECT City, SUM(DATEDIFF(minute,StartDate,Completed)) AS Downtime FROM Incidents GROUP BY City

Answer 1

using System.Data.Linq.SqlClient;

---

db.Incidents
  .GroupBy(i => i.City)
  .Select(g => new
  {
    City = g.Key,
    DownTime = g.Sum(i => SqlMethods.DateDiffMinute(i.StartDate, i.Completed))
  });

Answer 2

Yes. You have to use the SqlMethods class.

http://msdn.microsoft.com/en-us/library/bb882657.aspx