ChatGPT controller with injected repository example.

ChatGPT_controller_with_repository_example.cs

//Generate a .NET API ProductController which has hardcoded Products (in a repository
//which is injected into the ProductController constructor) and full crud actions
//using strongly typed DTOs which map to domain models using the explicit operator in C#. 

using System.Collections.Generic;
using System.Linq;
using System.Web.Http;

namespace ProductAPI.Controllers
{
    public class ProductController : ApiController
    {
        private readonly IProductRepository _productRepository;

        public ProductController(IProductRepository productRepository)
        {
            _productRepository = productRepository;
        }

        // GET api/product
        public IEnumerable<ProductDTO> Get()
        {
            return _productRepository.GetAll().Select(product => (ProductDTO)product);
        }

        // GET api/product/5
        public ProductDTO Get(int id)
        {
            var product = _productRepository.GetById(id);
            return (ProductDTO)product;
        }

        // POST api/product
        public void Post(ProductDTO productDTO)
        {
            var product = (Product)productDTO;
            _productRepository.Add(product);
        }

        // PUT api/product/5
        public void Put(int id, ProductDTO productDTO)
        {
            var product = (Product)productDTO;
            product.Id = id;
            _productRepository.Update(product);
        }

        // DELETE api/product/5
        public void Delete(int id)
        {
            _productRepository.Delete(id);
        }
    }
}

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


    public static explicit operator ProductDTO(Product product)
    {
        return new ProductDTO
        {
            Id = product.Id,
            Name = product.Name,
            Price = product.Price
        };
    }

    public static explicit operator Product(ProductDTO productDTO)
    {
        return new Product
        {
            Id = productDTO.Id,
            Name = productDTO.Name,
            Price = productDTO.Price
        };
    }
}

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

public interface IProductRepository
{
    IEnumerable<Product> GetAll();
    Product GetById(int id);
    void Add(Product product);
    void Update(Product product);
    void Delete(int id);
}

public class ProductRepository : IProductRepository
{
    private static readonly List<Product> Products = new List<Product>
    {
        new Product { Id = 1, Name = "Product 1", Price = 10.99m },
        new Product { Id = 2, Name = "Product 2", Price = 20.99m },
        new Product { Id = 3, Name = "Product 3", Price = 30.99m }
    };

    public IEnumerable<Product> GetAll()
    {
        return Products;
    }

    public Product GetById(int id)
    {
        return Products.SingleOrDefault(product => product.Id == id);
    }

    //often gets cut off at the end