Csharp 只有第一个LINQ.Count()语句有效

我试着从CVS文件中获取数据，一切都很顺利，但我不能对它使用LINQ，第一条语句总是有效的，但接下来的语句总是返回0

CVS头:CAR_MAKE、CAR_MODEL、CAR_MODEL_Year、CAR_VIN

public static void Main(string[] args)
{
    using (var reader = new StreamReader("D:\\C#\\CSV_Deserialization\\obj\\Debug\\net7.0\\Cars1.csv"))
    using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
    {
        //csv.Context.RegisterClassMap<MyCarMap>();
        var records = csv.GetRecords<Cars>();
           
        int HondaCounter = records.Count(car => car.CarMake == "Honda");
        int ChevroletCounter = records.Count(car => car.CarMake == "Chevrolet");
        int PontiacCounter = records.Count(car => car.CarMake == "Pontiac");

        Console.WriteLine(HondaCounter);
        Console.WriteLine(ChevroletCounter);
        Console.WriteLine(PontiacCounter);
          
    }
}

namespace CSV_Deserialization
{
    public class Cars
    {
        [Name("car_make")]
        public string CarMake { get; set;}
        [Name("car_model")]
        public string CarModel { get; set; }
        [Name("car_model_year")]
        public int CarModelYear { get; set; }
        [Name("car_vin")]
        public string CarVin {  get; set; }

    }
}

namespace CSV_Deserialization
{
    public class MyCarMap :ClassMap<Cars>
    {
        public MyCarMap()
        {
            Map(m => m.CarMake).Name("car_make");
            Map(m => m.CarModel).Name("car_model");
            Map(m => m.CarModelYear).Name("car_model_year");
            Map(m => m.CarVin).Name("car_vin");
        }
       
    }
}

它不适用于 map 或索引

我已try 更改CSV、索引并进行了判断