Linq Getting Customers group by date and then by their type

Question

I am working on generating report for showing customer using LINQ in C#. I want to show no. of customers of each type.

There are 3 types of customer registered, guest and manager. I want to group by customers by registered date and then by type of customer. i.e If today 3 guest, 4 registered and 2 manager are inserted. and tomorrow 4,5 and 6 are registered resp. then report should show Number of customers registerd on the day . separate row for each type.

DATE        TYPEOF CUSTOMER    COUNT
31-10-2013  GUEST              3
31-10-2013  REGISTERED         4
31-10-2013  MANAGER            2
30-10-2013  GUEST              5
30-10-2013  REGISTERED         10
30-10-2013  MANAGER            3

LIKE THIS .

var subquery = from eat in _customerRepo.Table
                           group eat by new { yy = eat.CreatedOnUTC.Value.Year, mm = eat.CreatedOnUTC.Value.Month, dd = eat.CreatedOnUTC.Value.Day } into g
                           select new { Id = g.Min(x => x.Id) };




var query = from c in _customerRepo.Table
                        join cin in subquery.Distinct() on c.Id equals cin.Id
                        select c;

By above query I get minimum cutomers registerd on that day Thanks in advance

Answer 1

var query = _customerRepo.Table
     .GroupBy(c => new {Date = c.Date.Date,  Type = c.TypeOfCustomer})
     .Select(g => new 
                   {
                       Date = g.Key.Date,
                       Type = g.Key.Type, 
                       Count = g.Count
                   }
            )
     .OrderByDescending (r = r.Date);

Answer 2

var query = from c in _customerRepo.Table
            group c by new { c.TypeOfCustomer, c.Date } into g
            orderby g.Key.Date descending,
                    g.Key.TypeOfCustomer == "GUEST" ? 1 :
                    g.Key.TypeOfCustomer == "REGISTERED" ? 2 : 3
            select new {
               g.Key.Date,
               g.Key.TypeOfCustomer,
               Count = g.Count()
            };

You can remove second ordering if it's not required for daily results to be in order guest > registered > manager:

var query = from c in _customerRepo.Table
            group c by new { c.TypeOfCustomer, c.Date } into g
            orderby g.Key.Date descending
            select new {
               g.Key.Date,
               g.Key.TypeOfCustomer,
               Count = g.Count()
            };