下面直接上代码
扩展方法
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:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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; } } }
效果图: