c# - How to use GetById function in c#

Question

I am learning c#. I am trying to create a basic list in a mock repository (Rather than jumping into pulling data from SQL straight away). I have a list that contains cars and has fields such as Id, Model, Make, description etc.

I am then trying to create a method in my Car.CS class, of which gets the car by Id. For example if i pass in the ID of the car, it will return the other details of the car.

Unfortunately when i run the console application, it just returns blank in the console? Could someone let me know where i'm going wrong please?

First of all i have an ICarRepository

namespace GeneralConsoleApp
{
    interface ICarRepository
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
        public decimal Price { get; set; }
    }
}

and then i have my MockCarRepository of which contains the list

namespace GeneralConsoleApp
{
    class MockCarRepository : ICarRepository
    {
        public IEnumerable<Car> Cars =>
            new List<Car>
            {
                new Car {Id = 1, Name="BMW", Price=23000.00M, Description="BMW car" }
            };

        public int Id { get; set; }
        public string Name {get; set; }
        public string Description { get; set; }
        public decimal Price { get; set; }
    }
}

Next is my Car.cs

namespace GeneralConsoleApp
{
    class Car
    {
        private readonly List<Car> CarList = new List<Car>();

        public int Id { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public string Description { get; set; }

        public Car GetCarById(int Id)
        {
            return CarList.FirstOrDefault(z => z.Id == Id);

        }
    }
}

And finally my program.cs main method

namespace GeneralConsoleApp
{
    class Program
    {

        static void Main()
        {
            Car car = new Car();


            Console.WriteLine(car.GetCarById(1));

            Console.ReadLine();
        }
    }
}

标签： c#

Answer 1

Your Car class does not use MockCarRepository but has it's own empty list instead (CarList).

You should either populate the list in the Car or use the mock repository there.