TagSerializable.cs

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using System;

namespace Terraria.ModLoader.IO
{
    //implement this interface and add
    //public static Func<TagCompound, ClassName> DESERIALIZER
    //to your class to make it automatically serializable
    public interface TagSerializable
    {
        TagCompound SerializeData();
    }

    internal class TagSerializableSerializer<T> : TagSerializer<T, TagCompound> where T : TagSerializable
    {
        private Func<TagCompound, T> deserializer;

        public TagSerializableSerializer() {
            var type = typeof(T);
            var field = type.GetField("DESERIALIZER");
            if (field != null) {
                if (field.FieldType != typeof(Func<TagCompound, T>))
                    throw new ArgumentException(
                        $"Invalid deserializer field type {field.FieldType} in {type.FullName} expected {typeof(Func<TagCompound, T>)}.");

                deserializer = (Func<TagCompound, T>)field.GetValue(null);
            }
        }

        public override TagCompound Serialize(T value) {
            var tag = value.SerializeData();
            tag["<type>"] = value.GetType().FullName;
            return tag;
        }

        public override T Deserialize(TagCompound tag) {
            if (tag.ContainsKey("<type>") && tag.GetString("<type>") != Type.FullName) {
                var instType = GetType(tag.GetString("<type>"));
                TagSerializer instSerializer;
                if (instType != null && Type.IsAssignableFrom(instType) && TryGetSerializer(instType, out instSerializer))
                    return (T)instSerializer.Deserialize(tag);
            }

            if (deserializer == null)
                throw new ArgumentException($"Missing deserializer for type '{Type.FullName}'.");

            return deserializer(tag);
        }
    }
}