Question

So I have an SQL statement looks like this

SELECT T1.NAME, COUNT(T2.VALUE) AS numInstances
FROM TABLE2 T2 LEFT OUTER JOIN
     TABLE1 T1 on T2.NAME_ID = T1.NAME_ID
WHERE (T2.DATE BETWEEN to_date('01-Aug-2011', 'dd-mon-yyyy') 
      AND to_date('31-Aug-2011' , 'dd-mon-yyyy')) AND T2.VALUE = 1))
GROUP BY T1.NAME

This statement looks for when names to match in the 2 tables and then find all ‘1’ values (these relate to something like sick day, worked, day off, ect) in the month of august and then count how many of each I have. This SQL statement works great but I’m using MVC .NET in C# and need this to be a LINQ statement that generates a Dictionary.

So i would like the Dictionary to look something like,

NAME   VALUECOUNT
John   8
Joe    1
Eric   0

I’ve tried

Dictionary<string,int> results =
(from t2 in db.table2.Where(t2 => m.Value == 1)
 from t1 in db.table1
 where(t2.DATE >= new DateTime(2011,8,1) && t2.DATE <= new DateTme(2011,8,31)
 orderby t1.NAME
 group new{T2, T1} by new {t2.VALUE, t1.NAME} into g
 select new { 
   new KeyValuePair<string,int>(
      g.Key.NAME,
     (int)g.sum(g => g.Key.Value))
}).AsEnumerable().ToDictionary();

Ideas?

Answer 1

using(DbEntities db = new DbEntities())
{
  var fromDate = new DateTime(2011,8,1);
  var toDate = new DateTime(2011,8,31);
  var dictionary =
            (from t1 in db.TABLE1
            join t2 in db.TABLE2.Where(x => x.VALUE == 1 && x.DATE >= fromDate && x.DATE <= toDate)
            on t1.NAME_ID equals t2.NAME_ID into t2_j
            from t2s in t2_j.DefaultIfEmpty()
            group t2s by t1.NAME into grouped
            select new { Name = grouped.Key, Count = grouped.Sum(x => x.VALUE) }).
            Where(x => x.Count.HasValue).
            ToDictionary(o => o.Name,o => o.Count);
   return dictionary;

}