计算我的ASP.NET MVC项目中相同产品名称的总和

Question

How do I count total amount of cars of the same car name by a group using LINQ (using Query or method syntax)..? My table name "Cars" looks like following:

CarId   CarName Color   Status
1      Volvo    Red      2 
2      Toyota   Black    1
3      Volvo    White    5
4      Ford     Blue     3
5      Toyota   Silver   5

I want result like this (Name of the Car and summery of Status):

Volvo   7
Toyota  6
Ford    3

In this Result I have 7 Volovs, 6 Toyotas and 3 Fords.
How should I form it to get the correct Result that I'am looking for? I tried

 [HttpGet]
        public async Task<ActionResult> GetSumOfCars()
        {
            using (context)
            {
                return (PartialView("_CarList", await context.Cars.GroupBy(m =>m.CarName).Count????.ToListAsync()));
            }

        }

or LINQ (using query syntax)

var _Results = from Cars in ???
        Count(Status)
                groupedby CarName
                select Status;

But givs me wrong Result. I would be grateful if you guys would help me.

Answer 1

The group by section of your query is correct.

Selecting count from the group usually comes with an anonymous class:

return PartialView(
    "_CarList",
    await context.Cars
        .GroupBy(m =>m.CarName)
        .Select(g => new { CarName = g.Key, Count = g.Sum(c => c.Status) })
        .ToListAsync()
);

Answer 2

from car in context.Cars 
group car by new { car.CarName } into carGrouping
select new {
  Name=carGrouping.Key,
  Count = carGrouping.Count()
};