public class Source1
  {
    public string Name { set; get; }

    public string GetA { set; get; }
    public string GetD { set; get; }


    public string SetB { set; get; }

    public string c { set; get; }

    public SubSource1 Sub { set; get; }
  }


  public class SubSource1
  {
    public string Age { set; get; }

  }

  public class Dest1
  {
    public string Name { set; get; }

    public string A { set; get; }

    public string C { set; get; }

    public string SubAge { set; get; }

    public string D { set; get; }
  }

    /// <summary>
    /// 类型映射,默认字段名字一一对应
    /// </summary>
    /// <typeparam name="TDestination">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</returns>
    public static TDestination MapTo<TDestination, TSource>(this TSource source) 
      where TDestination:class 
      where TSource :class 
    {
      if (source == null) return default(TDestination);
      var config = new MapperConfiguration(cfg => cfg.CreateMap<TDestination, TSource>());
      var mapper = config.CreateMapper();
      return mapper.Map<TDestination>(source);
    }

        var source1 = new Source1
        {
          Name = "source",
          Sub = new SubSource1 { Age = "25" },
          c = "c",
          GetA = "A",
          SetB = "B"
        };

        var destViewModel = source1.MapTo<Dest1, Source1>();

        var config2 = new MapperConfiguration(
          cfg => cfg.CreateMap<SourceUser, DestUser2>()
            .ForMember(d => d.DestName, opt => opt.MapFrom(s => s.Name))  //指定字段一一对应
            .ForMember(d => d.Birthday, opt => opt.MapFrom(src => src.Birthday.ToString("yy-MM-dd HH:mm")))//指定字段，并转化指定的格式
            .ForMember(d => d.Age, opt => opt.Condition(src => src.Age > 5))//条件赋值
            .ForMember(d => d.A1, opt => opt.Ignore())//忽略该字段，不给该字段赋值
            .ForMember(d => d.A1, opt => opt.NullSubstitute("Default Value"))//如果源字段值为空，则赋值为 Default Value
            .ForMember(d => d.A1, opt => opt.MapFrom(src => src.Name + src.Age * 3 + src.Birthday.ToString("d"))));//可以自己随意组合赋值
        var mapper2 = config2.CreateMapper();

    /// <summary>
    /// 集合列表类型映射,默认字段名字一一对应
    /// </summary>
    /// <typeparam name="TDestination">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 IEnumerable<TDestination> MapToList<TDestination, TSource>(this IEnumerable<TSource> source)
      where TDestination : class
      where TSource : class
    {
      if (source == null) return new List<TDestination>();
      var config = new MapperConfiguration(cfg => cfg.CreateMap<TDestination, TSource>());
      var mapper = config.CreateMapper();
      return mapper.Map<List<TDestination>>(source);
    }

        var source1 = new Source1
        {
          Name = "source",
          Sub = new SubSource1 { Age = "25" },
          c = "c",
          GetA = "A",
          SetB = "B"
        };
var source3 = new Source1
        {
          Name = "source3",
          Sub = new SubSource1 { Age = "253" },
          c = "c3",
          GetA = "A3",
          SetB = "B3"
        };
        var sourceList = new List<Source1> { source1, source3 };
        var destViewModelList = sourceList.MapToList<Dest1, Source1>();