AutoMapper根据枚举映射到不同的类型？

using AutoMapper;

public class Source
{
    public int Value { get; set; }
}

public class Destination
{
    public string Value { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<Source, Destination>();
        });

        var mapper = config.CreateMapper();

        var source = new Source { Value = 1 };
        var destination = mapper.Map<Source, Destination>(source);

        Console.WriteLine(destination.Value); // 输出 "1"
    }
}

public enum Color
{
    Red,
    Green,
    Blue
}

using AutoMapper;

public class Source
{
    public Color Color { get; set; }
}

public class Destination
{
    public string Color { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<Source, Destination>()
                .ForMember(dest => dest.Color, opt => opt.ConvertUsing(src => src.Color.ToString()));
        });

        var mapper = config.CreateMapper();

        var source = new Source { Color = Color.Red };
        var destination = mapper.Map<Source, Destination>(source);

        Console.WriteLine(destination.Color); // 输出 "Red"
    }
}