split()方法的使用及要点

好的，点餐系统可以分为客户端和服务端两部分。客户端负责展示菜单、接收用户的点餐信息以及向服务端发送请求。服务端负责处理请求，保存订单信息并提供管理订单的功能。以下是一个简单的C#点餐系统示例： ### 客户端 ```csharp using System; using System.Net.Http; using System.Text.Json; using System.Collections.Generic; namespace OrderClient { class Program { static HttpClient client = new HttpClient(); static JsonSerializerOptions options = new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase, WriteIndented = true }; static void Main(string[] args) { while (true) { Console.WriteLine("欢迎使用点餐系统！"); Console.WriteLine("请选择您要点的菜品："); // 获取菜单信息 var menu = GetMenu(); foreach (var item in menu) { Console.WriteLine($"{item.Id}: {item.Name} - {item.Price}元"); } // 输入订单信息 Console.Write("请输入您要点的菜品编号，多个菜品请用逗号隔开："); var input = Console.ReadLine(); // 发送订单信息到服务端 var order = new Order { Items = input.Split(',') }; var response = client.PostAsJsonAsync("http://localhost:5000/orders", order).Result; if (response.IsSuccessStatusCode) { Console.WriteLine("订单提交成功！"); } else { Console.WriteLine("订单提交失败，请稍后再试！"); } Console.WriteLine("按任意键继续点餐，按q退出程序。"); var key = Console.ReadKey(); if (key.KeyChar == 'q') { break; } } } static List<MenuItem> GetMenu() { var response = client.GetAsync("http://localhost:5000/menu").Result; if (response.IsSuccessStatusCode) { var content = response.Content.ReadAsStringAsync().Result; return JsonSerializer.Deserialize<List<MenuItem>>(content, options); } else { return new List<MenuItem>(); } } } class Order { public string[] Items { get; set; } } class MenuItem { public int Id { get; set; } public string Name { get; set; } public decimal Price { get; set; } } } ``` ### 服务端 ```csharp using System; using System.Collections.Generic; using System.Linq; using Microsoft.AspNetCore.Mvc; using Microsoft.Extensions.Logging; namespace OrderServer.Controllers { [ApiController] [Route("[controller]")] public class OrdersController : ControllerBase { private static readonly List<Order> orders = new List<Order>(); private static readonly List<MenuItem> menu = new List<MenuItem> { new MenuItem { Id = 1, Name = "麻婆豆腐", Price = 18.5M }, new MenuItem { Id = 2, Name = "宫保鸡丁", Price = 22M }, new MenuItem { Id = 3, Name = "清蒸鲈鱼", Price = 56M }, new MenuItem { Id = 4, Name = "红烧肉", Price = 38M }, new MenuItem { Id = 5, Name = "酸菜鱼", Price = 48M } }; private readonly ILogger<OrdersController> _logger; public OrdersController(ILogger<OrdersController> logger) { _logger = logger; } [HttpGet] [Route("menu")] public List<MenuItem> GetMenu() { return menu; } [HttpPost] public IActionResult Post([FromBody] OrderRequest request) { var order = new Order { Id = Guid.NewGuid().ToString(), Items = request.Items.Select(GetMenuItemById).ToList(), TotalPrice = request.Items.Select(GetMenuItemById).Sum(item => item.Price) }; orders.Add(order); return Ok(); } [HttpGet] public List<Order> Get() { return orders; } [HttpDelete] public IActionResult Delete(string id) { var order = orders.FirstOrDefault(o => o.Id == id); if (order != null) { orders.Remove(order); return Ok(); } else { return NotFound(); } } private MenuItem GetMenuItemById(string id) { if (int.TryParse(id, out var itemId)) { return menu.FirstOrDefault(item => item.Id == itemId); } else { throw new ArgumentException("Invalid item id", nameof(id)); } } } public class OrderRequest { public string[] Items { get; set; } } public class Order { public string Id { get; set; } public List<MenuItem> Items { get; set; } public decimal TotalPrice { get; set; } } public class MenuItem { public int Id { get; set; } public string Name { get; set; } public decimal Price { get; set; } } } ``` 以上代码仅供参考，实际生产环境中需要考虑更多的安全性、性能等方面。