using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Text;

using System.Threading.Tasks;

using System.Xml.Serialization;

namespace ConsoleApplication2

{

    class Program

    {

        static void Main(string[] args)

        {

            AnimalTypeTestClass testClass = new AnimalTypeTestClass() { Age = "", Name = ""};

            Na a = (Na)ClassToHellp.Map<Na>(testClass);

            Console.WriteLine(a.MyAge);

            Console.WriteLine(a.MyName);

        }

    }

    public class ClassToHellp

    {

        public static object Map<T>(object os) where T : class, new()

        {

            // 被转换的类

            var t = new T();

            var fieldInfos = t.GetType().GetFields();

            foreach (var mInfo in os.GetType().GetFields())

            {

                var mInfoValue = mInfo.GetValue(os);

                if (mInfoValue == null)

                    continue;

                foreach (var field in Attribute.GetCustomAttributes(mInfo)

                    .Where(attr => attr.GetType() == typeof(ObjectToTypeAttribute))

                    .SelectMany(attr => fieldInfos.Where(field => field.Name == ((ObjectToTypeAttribute)attr).Field)))

                {

                    field.SetValue(t, mInfoValue);

                }

            }

            return t;

        }

    }

    [AttributeUsage(AttributeTargets.Field)]

    public class ObjectToTypeAttribute : Attribute

    {

        public string Field { get; set; }

        public ObjectToTypeAttribute(string pet)

        {

            Field = pet;

        }

    }

    public class AnimalTypeTestClass

    {

        [ObjectToType("MyName")]

        public string Name;

        [ObjectToType("MyAge")]

        public string Age;

    }

    public class Na

    {

        public string MyName;

        public string MyAge;

    }

}