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
