Uso de GroupBy, Count y Sum en LINQ Lambda Expressions

Question

Tengo una colección de cajas con las propiedades peso, volumen y propietario.

Quiero usar LINQ para obtener una lista resumida (particular) de la información del cuadro de

por ejemplo,

**Owner, Boxes, Total Weight, Total Volume** 
Jim,  5,  1430.00,  3.65 
George, 2,  37.50,  1.22 

¿Alguien me puede mostrar cómo hacer esto con expresiones Lambda?

Answer 1

var ListByOwner = list.GroupBy(l => l.Owner) 
          .Select(lg => 
           new { 
            Owner = lg.Key, 
            Boxes = lg.Count(), 
            TotalWeight = lg.Sum(w => w.Weight), 
            TotalVolume = lg.Sum(w => w.Volume) 
           }); 

Answer 2

 var q = from b in listOfBoxes 
       group b by b.Owner into g 
       select new 
          { 
           Owner = g.Key, 
           Boxes = g.Count(), 
           TotalWeight = g.Sum(item => item.Weight), 
           TotalVolume = g.Sum(item => item.Volume) 
          }; 

Answer 3

var boxSummary = from b in boxes 
       group b by b.Owner into g 
       let nrBoxes = g.Count() 
       let totalWeight = g.Sum(w => w.Weight) 
       let totalVolume = g.Sum(v => v.Volume) 
       select new { Owner = g.Key, Boxes = nrBoxes, 
           TotalWeight = totalWeight, 
           TotalVolume = totalVolume }