C# 如何使用AutoMapper将信息从一个对象中的一个对象映射到另一个对象

假设我的ASP.NETCore5项目中有3个对象类。我正在使用包AutoMapper.Extensions.Microsoft.DependencyInjection。课程包括：

public class Order 
{
    public int OrderId {get; set;}
    public double OrderPrice{ get; set; }
    public int CustomerId { get; set; }
    public virtual Customer Customer { get; set; }
}

public class Customer 
{
    public int CustomerId { get; set; }
    public string CustomerName{ get; set; }
}

public class OrderODTO 
{
    public int OrderId {get; set;}
    public double OrderPrice{ get; set; }
    public string CustomerName{ get; set; }
}

现在，当我在Order和OrderODTO之间使用Automapper时，OrderId和OrderPrice值将被映射，但是CustomerName始终为null，即使Order对象中包含了对象customer。比如说

order 
{
    orderId: 1,
    orderPrice: 3.99,
    customerId: 2,
    customer {
        customerId: 2,
        customerName: "Jack"
   }
}

---

因此，如何使用Automapper将订单和客户对象映射到1个对象orderODTO？

您需要设置订单和orderODTO之间的映射：

var config = new MapperConfiguration(cfg => cfg.CreateMap<Order, OrderODTO>()
            .ForMember("CustomerName", opt => opt.MapFrom(src => src.Customer.CustomerName)));

var mapper = new Mapper(config);
        Order order = new Order()
        {
            OrderId = 1,
            OrderPrice = 3.99,
            CustomerId = 2,
            Customer = new Customer() {
                CustomerId = 2,
                CustomerName = "Jack"
            }
        };
OrderODTO orderOdto = mapper.Map<Order, OrderODTO>(order);

orderOdto 
{
    OrderId: 1,
    OrderPrice: 3.99,
    CustomerName: "Jack"
}