c# AutoMapper 扩展

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下面直接上代码

    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
    }

测试：

using AutoMapper;
using System;
using System.Collections.Generic;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Mapp();
            Console.WriteLine("Hello World!");
        }
        static void Mapp()
        {
            #region 实例一 源实体与转换后实体字段不一致 指定字段一一对应，并转化指定的格式
            var config = new MapperConfiguration(cfg => cfg.CreateMap<Source, Destination>()
            #region MapFrom 指定字段一一对应，并转化指定的格式
             .ForMember(d => d.Year, o => o.MapFrom(src => $"年：{src.CurrentDateTime.Year}"))
             .ForMember(d => d.Month, o => o.MapFrom(src => $"月：{src.CurrentDateTime.Month}"))
             .ForMember(d => d.Day, o => o.MapFrom(src => $"日：{src.CurrentDateTime.Day}"))
             .ForMember(d => d.Hour, o => o.MapFrom(src => $"时：{ src.CurrentDateTime.Hour}"))
             .ForMember(d => d.Minute, o => o.MapFrom(src => $"分：{src.CurrentDateTime.Minute}"))
             .ForMember(d => d.Second, o => o.MapFrom(src => $"秒：{src.CurrentDateTime.Second}"))
             .ForMember(d => d.DateTime, o => o.MapFrom(src => $"{src.CurrentDateTime.ToLocalTime()}"))
            #endregion
            );
            Source source = new Source { CurrentDateTime = DateTime.Now };
            List<Source> sourceList = new List<Source>();
            for (int i = 0; i < 1000; i++)
            {
                sourceList.Add(new Source { CurrentDateTime = DateTime.Now.AddDays(i) });
            }
            #endregion
            Destination result = source.ToMap<Source, Destination>(config);
            List<Destination> resultList = sourceList.ToMap<List<Source>, List<Destination>>(config);
            Destination result2 = source.ToMap<Source, Destination>();
            var resultList2 = sourceList.ToMap<Source, Destination>();
        }
    }
    public class Source
    {
        public DateTime CurrentDateTime { get; set; }
    }
    public class Destination
    {
        public string Year { get; set; }
        public string Month { get; set; }
        public string Day { get; set; }
        public string Hour { get; set; }
        public string Minute { get; set; }
        public string Second { get; set; }
        public string DateTime { get; set; }
        public DateTime currentdatetime { get; set; }
    }
}