我正在使用AutoMapper，这是我的代码来更新现有客户的详细信息，但当我更新一个字段时，其余的字段将为空。

public async Task<ResponseModel> Update(CustomerDTO customer, int id)
{
        ResponseModel responseModel = new ResponseModel();

        try
        {
            Customer? existingCustomer = await _dbContext.FindAsync<Customer>(id);

            if (existingCustomer == null)
            {
                return new ResponseModel()
                {
                    IsSuccess = false,
                    Message = $"Customer doesn't exist!"
                };
            }

            _mapper.Map(customer, existingCustomer);

            if (await _dbContext.SaveChangesAsync() > 0)
            {
                responseModel.Message = "Customer Updated Successfully";
                responseModel.IsSuccess = true;
            }
        }
        catch (Exception ex)
        {
            responseModel.IsSuccess = false;
            responseModel.Message = $"Error:{ex.Message}";
        }

        return responseModel;
}

下面是mapper配置文件：

using AutoMapper;
using static MGApi.Services.CustomerService;

namespace MGApi.Models
{
    public class CustomerProfile : Profile
    {
        public CustomerProfile()
        {
            CreateMap<CustomerDTO, Customer>();
        }
    }
}

我尝试使用ForAllOtherMembers添加，但它已被弃用。我不知道如何解决这个问题。
以下是客户模型：

using System.ComponentModel.DataAnnotations;

namespace MGApi.Models
{
    public class Customer
    {
        [Key]
        public int Id { get; set; }

        [Required]
        [StringLength(50)]
        [RegularExpression(@"^\d{10}$", ErrorMessage = "Invalid phone number")]

        public string? PhoneNumber { get; set; }

        [Required]
        [StringLength(50)]
        public string? Name { get; set; }

        [StringLength(100)]
        [EmailAddress]
        public string? Email { get; set; }

        [StringLength(10)]
        public string? Gender { get; set; }

        [DataType(DataType.Date)]
        public DateTime DateOfBirth { get; set; }
        public ICollection<CustomerData>? CustomerData { get; set; }

    }
}

下面我们有一个CustomerData模型，它有一个基于Customer模型主键的外键：

using System.ComponentModel.DataAnnotations;

namespace MGApi.Models
{
    public class CustomerData
    {
        [Key]
        public int Id { get; set; }
        public int CustomerId { get; set; }

        public double Sugar { get; set; }

        public double BP { get; set; }

        public double Height { get; set; }

        public double Weight { get; set; }

        public DateTime Timestamp { get; set; } = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, TimeZoneInfo.FindSystemTimeZoneById("India Standard Time"));

        public Customer? Customer { get; set; }
    }
}