Can't fill my model with a grouped list of a table using LINQ

Question

I'm working on a new project using .NET MVC4 and Entity Framework. I have a products table and i'm trying to select products with grouping.

My model:

public class Cart
{
    public long Index { get; set; }
    public List<Products> ProductList = new List<Products>();
    public int ItemCount { get; set; }
    public decimal Total { get; set; }
}

My Query:

var result = from p in productList
             group p by p.id into grp
             select new
             {
                 Index = grp.Key,
                 ProductList = grp.ToList<Products>(),
                 ItemCount = grp.Count(),
                 Total = grp.Sum(w => w.price)
             };

And then i wanted to apply result to a List of Cart. But i failed at some point. Please can you help me to do that.

Answer 1

You need to specify the type returned by your select

var result = from p in productList
             group p by p.id into grp
             select new Cart  //<-- here
             {
                 Index = grp.Key,
                 ProductList = grp.ToList<Products>(),
                 ItemCount = grp.Count(),
                 Total = grp.Sum(w => w.price)
             };

now result is of type IEnumerable<Cart> . You could add an extra ToList() to make it List<Cart> :

List<Cart> lst = result.ToList();