c# - 使用自定义工厂通过 Automapper 创建目标类型

Question

我有CustomerDto和CustomerDomainModel。我希望 Automapper在构造对象时使用DataBindingFactory 这里提到的。CustomerDomainModel我在课堂上看过ConstructUsing和AfterMap函数，Mapper但我找不到完成我想做的事情的方法。我该怎么做呢？

Answer 1

您应该可以使用ConstructUsing它。不过，您可能必须像这样显式转换为正确的表达式：

class Program
    {
        private static void Main(string[] args)
        {
            Mapper.CreateMap<CustomerDto, CustomerDomainModel>()
                    .ForMember(d => d.Id, opt => opt.Ignore())
                      .ConstructUsing((Func<ResolutionContext, CustomerDomainModel>) (rc => DataBindingFactory.Create<CustomerDomainModel>()));

            var dto = new CustomerDto {FirstName = "First", LastName = "Last"};
            var domain = Mapper.Map<CustomerDto, CustomerDomainModel>(dto);
            Console.WriteLine("First: " + domain.FirstName);
            Console.WriteLine("Last: " + domain.LastName);
            Console.ReadLine();
        }
    }

    public class CustomerDto
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class CustomerDomainModel
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public static class DataBindingFactory
    {
        public static T Create<T>()
        {
            return Activator.CreateInstance<T>();
        }
    }