无法将业务对象映射到数据对象

本文关键字：对象 映射 数据 业务 | 更新日期: 2023-09-27 17:57:43

我真的在用Automapper。我觉得它不直观，而且很难使用。手动编写映射代码会容易得多。我有两种简单的类型：

    namespace BusinessObjects
    {
        public class Application
        {
            public int ID { get; set; }
            public string FirstName { get; set; }
            public string Surname { get; set; }
            public System.DateTime DateOfBirth { get; set; }
            public System.DateTime CreatedTime { get; set; }
            public System.DateTime ModifiedTime { get; set; }
            public System.DateTime ApplicationDate { get; set; }
            public string Qualified { get; set; }
            public int salary { get; set; }
            public string userID { get; set; }
    }
    }
namespace DataObjects
{
    using System;
    using System.Collections.Generic;
    public partial class Application
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string Surname { get; set; }
        public System.DateTime DateOfBirth { get; set; }
        public System.DateTime CreatedTime { get; set; }
        public System.DateTime ModifiedTime { get; set; }
        public System.DateTime ApplicationDate { get; set; }
        public string Qualified { get; set; }
        public int salary { get; set; }
        public string userID { get; set; }
    }
}

和控制器：

public ApplicationController()
        {
            Mapper.Initialize(cfg => cfg.CreateMap<BusinessObjects.Application, ApplicationModel>());
            config = new MapperConfiguration(cfg =>
            {
                cfg.CreateMap<BusinessObjects.Application, ApplicationModel>();
            });
            config.AssertConfigurationIsValid();
            Mapper.Initialize(cfg => cfg.CreateMap<ApplicationModel,BusinessObjects.Application>());
            config2 = new MapperConfiguration(cfg =>
            {
                cfg.CreateMap<ApplicationModel,BusinessObjects.Application>();
            });
            config2.AssertConfigurationIsValid();
        }
    public int Create(BusinessObjects.Application businessApplication)
            {
                var mapper =config2.CreateMapper();
                DataObjects.Application dataApplication = AutoMapper.Mapper.Map<DataObjects.Application>(businessApplication);
                int count = 0;
                using (CreditCardPreQualificationEntities CreditCardPreQualificationDatabase = new CreditCardPreQualificationEntities())
                {
                    CreditCardPreQualificationDatabase.Applications.Add(dataApplication);
                    count = CreditCardPreQualificationDatabase.SaveChanges();
                }
                return count;
            }

我几乎花了整整一个周末的时间试图让它发挥作用，但并没有更接近。我根本看不出Automapper的好处。我得到的错误是："在AutoMapper.dll中发生了类型为"AutoMapper.AutoMapperMappingException"的异常，但未在用户代码中处理

附加信息：缺少类型映射配置或不支持的映射。"请帮忙。

无法将业务对象映射到数据对象

您的配置看起来。。。。正如文档所说，您需要为整个AppDomain初始化AutoMapper一次，而且只初始化一次。在您的global.asax（或类似的）中，添加：

Mapper.Initialize(cfg => {
    cfg.CreateMap<BusinessObjects.Application, DataObjects.Application>()
       .ReverseMap();
});

看起来你需要两个方向的贴图，所以我添加了ReverseMap。然后在你的控制器中，删除所有初始化和映射器创建垃圾，直接使用AutoMapper：

    public int Create(BusinessObjects.Application businessApplication)
        {
            DataObjects.Application dataApplication = Mapper.Map<BusinessObjects.Application, DataObjects.Application>(businessApplication);
            int count = 0;
            using (CreditCardPreQualificationEntities CreditCardPreQualificationDatabase = new CreditCardPreQualificationEntities())
            {
                CreditCardPreQualificationDatabase.Applications.Add(dataApplication);
                count = CreditCardPreQualificationDatabase.SaveChanges();
            }
            return count;
        }

完成！

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