public static class Ext
    {
        #region 对象或集合，字段不一致 自定义转换规则 Mapping
        /// <summary>
        /// 集合列表类型映射,默认字段名字一一对应
        /// </summary>
        /// <typeparam name="TResult">转化之后的model，可以理解为viewmodel</typeparam>
        /// <typeparam name="TSource">要被转化的实体，Entity</typeparam>
        /// <param name="source">可以使用这个扩展方法的类型，任何引用类型</param>
        /// <returns>转化之后的实体列表</returns>
        public static TResult ToMap<TSource, TResult>(this TSource source, MapperConfiguration config) where TResult : class where TSource : class
        {
            if (source == null) return default(TResult);
            return config.CreateMapper().Map<TResult>(source);
        }
        #endregion

        #region 字段一致之间转换

        #region 字段一致对象实体之间转换
        /// <summary>
        /// 字段一致对象实体之间转换
        /// </summary>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="self"></param>
        /// <returns></returns>
        public static TResult ToMap<TSource, TResult>(this TSource source)
        {
            if (source == null)
                return default(TResult);
            Mapper.Reset();
            Mapper.Initialize(x => x.CreateMap<TSource, TResult>());
            return Mapper.Map<TResult>(source);
        }
        #endregion

        #region 字段一致集合之间转换
        /// <summary>
        /// 字段一致集合之间转换
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="source"></param>
        /// <returns></returns>
        public static IEnumerable<TResult> ToMap<TSource, TResult>(this IEnumerable source)
        {
            if (source == null) return default(IEnumerable<TResult>);
            Mapper.Reset();
            Mapper.Initialize(x => x.CreateMap<TSource, TResult>());
            return Mapper.Map(source, source.GetType(), typeof(IEnumerable<TResult>)) as IEnumerable<TResult>;
        }
        #endregion 

        #endregion
    }
    public static class