从零开始学习 asp.net core 3.1 web api 后端api基础框架(六)-把获取数据的代码整理成一个服务

ゝ一世哀愁。 2022-05-09 01:34 85阅读 0赞

建立一个Services目录, 然后建立一个 ProductService.cs类  
我们把获取数据的代码整理成一个ProductService, 然后保证程序运行的时候, 操作的是同一批数据:

namespace CoreBackend.Api.Services
    {
        public class ProductService
        {
            public static ProductService Current { get; } = new ProductService();
    
            public List<Product> Products { get; }
    
            private ProductService()
            {
                Products = new List<Product>
                {
                    new Product
                    {
                        Id = 1,
                        Name = "牛奶",
                        Price = 2.5f
                    },
                    new Product
                    {
                        Id = 2,
                        Name = "面包",
                        Price = 4.5f
                    },
                    new Product
                    {
                        Id = 3,
                        Name = "啤酒",
                        Price = 7.5f
                    }
                };
            }
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tpbmd5dW1hbw_size_16_color_FFFFFF_t_70][]

然后修改一下ProductController.cs里面的代码:

namespace CoreBackend.Api.Controllers
    {
        [Route("api/[controller]")]
        public class ProductController: Controller
        {
            [HttpGet]
            public JsonResult GetProducts()
            {
                return new JsonResult(ProductService.Current.Products);
            }
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tpbmd5dW1hbw_size_16_color_FFFFFF_t_70 1][]

也是同样的运行效果.

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tpbmd5dW1hbw_size_16_color_FFFFFF_t_70 2][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tpbmd5dW1hbw_size_16_color_FFFFFF_t_70]: /images/20220509/8c07f655a0a7440a994d01810233abfd.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tpbmd5dW1hbw_size_16_color_FFFFFF_t_70 1]: /images/20220509/e71fe19153944c5289d44c694336b68b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2tpbmd5dW1hbw_size_16_color_FFFFFF_t_70 2]: /images/20220509/6c6fb966b2d44fe98439b7338c10011e.png