linqtosql, timespan, aggregates ... peut-il être fait?

Question

Est-ce que cela peut être fait avec 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

Oui. Vous devez utiliser la classe SqlMethods.

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