我正在使用 AutoMapper，当我更新单个值时，它会使其余值变为空

Question

我正在使用 AutoMapper，这是我更新现有客户详细信息的代码，但是当我更新一个字段时，其余字段将被清空。

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;
}

这是映射器配置文件：

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。我不确定如何解决这个问题。