搭建医疗保险订单系统 6 步曲：需求调研→架构设计→开发测试→上线运维（附实操要点）

// 订单实体类示例
public class InsuranceOrder
{
    public int Id { get; set; }
    public string OrderNumber { get; set; }
    public string PolicyHolder { get; set; }
    public string InsuranceProduct { get; set; }
    public decimal Premium { get; set; }
    public DateTime EffectiveDate { get; set; }
    public DateTime ExpiryDate { get; set; }
    public OrderStatus Status { get; set; }
    
    // 构造函数
    public InsuranceOrder(string orderNumber, string policyHolder, 
                         string insuranceProduct, decimal premium)
    {
        OrderNumber = orderNumber;
        PolicyHolder = policyHolder;
        InsuranceProduct = insuranceProduct;
        Premium = premium;
        Status = OrderStatus.Pending;
    }
}

public enum OrderStatus
{
    Pending,
    Approved,
    Rejected,
    Expired
}

// 订单服务示例
public class OrderService : IOrderService
{
    private readonly ApplicationDbContext _context;
    
    public OrderService(ApplicationDbContext context)
    {
        _context = context;
    }
    
    // 创建订单
    public async Task CreateOrderAsync(OrderCreateDto createDto)
    {
        // 验证输入数据
        if (createDto == null)
            throw new ArgumentNullException(nameof(createDto));
        
        // 生成订单号
        string orderNumber = GenerateOrderNumber();
        
        // 创建订单对象
        var order = new InsuranceOrder(
            orderNumber,
            createDto.PolicyHolder,
            createDto.InsuranceProduct,
            createDto.Premium);
        
        // 设置有效期
        order.EffectiveDate = DateTime.Now;
        order.ExpiryDate = DateTime.Now.AddYears(1);
        
        // 保存到数据库
        _context.InsuranceOrders.Add(order);
        await _context.SaveChangesAsync();
        
        return order;
    }
    
    // 生成订单号
    private string GenerateOrderNumber()
    {
        return "IN" + DateTime.Now.ToString("yyyyMMddHHmmssfff");
    }
}

// 订单服务单元测试示例
[TestClass]
public class OrderServiceTests
{
    private ApplicationDbContext _context;
    private OrderService _orderService;
    
    [TestInitialize]
    public void Initialize()
    {
        // 使用内存数据库进行测试
        var options = new DbContextOptionsBuilder()
            .UseInMemoryDatabase(databaseName: "TestDatabase")
            .Options;
        
        _context = new ApplicationDbContext(options);
        _orderService = new OrderService(_context);
    }
    
    [TestMethod]
    public async Task CreateOrder_ValidInput_ReturnsOrderWithGeneratedNumber()
    {
        // 准备测试数据
        var createDto = new OrderCreateDto
        {
            PolicyHolder = "张三",
            InsuranceProduct = "医疗保险A",
            Premium = 5000m
        };
        
        // 执行测试
        var result = await _orderService.CreateOrderAsync(createDto);
        
        // 验证结果
        Assert.IsNotNull(result);
        Assert.IsTrue(result.OrderNumber.StartsWith("IN"));
        Assert.AreEqual("张三", result.PolicyHolder);
        Assert.AreEqual(OrderStatus.Pending, result.Status);
    }
    
    [TestCleanup]
    public void Cleanup()
    {
        _context.Dispose();
    }
}