标签:tom 一个个 ret img ati 获取用户信息 this art code
在上篇中我们通过创建一个类并继承autoMapper的Profile类
public class Mappings : Profile { public Mappings() { CreateMap<UserDto, TbUser>(); } }
这样做有一种弊端,就是当传输对象很多的时候,还需要手动一个个的配置映射关系,维护起来相对来说也比较麻烦。
创建AutoMapperExtension扩展类
/// <summary> /// AutoMapper扩展类 /// </summary> public static class AutoMapperExtension { /// <summary> /// 将源对象映射到目标对象 /// </summary> /// <typeparam name="T">实体类型</typeparam> /// <param name="obj">源对象</param> /// <returns>转化之后的实体</returns> public static T MapTo<T>(this object obj) { if (obj == null) throw new Exception("异常"); var config = new MapperConfiguration(ctx => ctx.CreateMap(obj.GetType(), typeof(T))); var mapper = config.CreateMapper(); return mapper.Map<T>(obj); } /// <summary> /// 将源对象映射到目标对象 /// </summary> /// <typeparam name="T">实体类型</typeparam> /// <param name="dto">源对象</param> /// <param name="entity">目标对象</param> /// <returns>转化之后的实体</returns> public static T Map<T>(object dto, T entity) { var config = new MapperConfiguration(ctx => ctx.CreateMap(dto.GetType(), typeof(T))); var mapper = config.CreateMapper(); var newModel = mapper.Map(dto, entity); return newModel; } }
去掉构造函数中IMapper注入
去掉启动类Startup.cs中 services.AddAutoMapper(typeof(Mappings)) 方法
/// <summary> /// 添加用户 /// </summary> /// <param name="dto">实体传输对象</param> /// <returns></returns> public int Add(UserDto dto) { //var info = _mapper.Map<UserDto, TbUser>(dto); var info = dto.MapTo<TbUser>(); info.AddTime = DateTime.Now; info.UserId = Guid.NewGuid().ToString("N"); //var user = new TbUser //{ // UserId = Guid.NewGuid().ToString("N"), // Email = dto.Email, // UserName = dto.UserName, // AddTime = DateTime.Now //}; _dbContext.Add(info); return _dbContext.SaveChanges(); } /// <summary> /// 编辑用户信息 /// </summary> /// <param name="dto">实体传输对象</param> /// <returns></returns> public int Update(UserDto dto) { var user = _dbContext.TbUsers.Find(dto.UserId); if (user == null) throw new Exception("获取用户信息失败"); //user.UserName = dto.UserName; //user.Email = dto.Email; AutoMapperExtension.Map(dto, user); return _dbContext.SaveChanges(); }
跟封装前一样的效果
标签:tom 一个个 ret img ati 获取用户信息 this art code
原文地址:https://www.cnblogs.com/yuany69/p/12793953.html