(C# : Server) 30. Serialization - 4

class PlayerInfoReq : Packet
{
    public long playerId;
    public string name;

    public struct SkillInfo
    {
        public int id;
        public short level;
        public float duration;

        public bool Write(Span<byte> s, ref ushort count)
        {
            bool success = true;
            success &= BitConverter.TryWriteBytes(s.Slice(count, s.Length - count), id);
            count += sizeof(int);
            success &= BitConverter.TryWriteBytes(s.Slice(count, s.Length - count), level);
            count += sizeof(short);
            success &= BitConverter.TryWriteBytes(s.Slice(count, s.Length - count), duration);
            count += sizeof(float);

            return success;
        }

        public void Read(ReadOnlySpan<byte> s, ref ushort count)
        {
            id = BitConverter.ToInt32(s.Slice(count, s.Length - count));
            count += sizeof(int);
            level = BitConverter.ToInt16(s.Slice(count, s.Length - count));
            count += sizeof(short);
            duration = BitConverter.ToSingle(s.Slice(count, s.Length - count));
            count += sizeof(float);
        }
    }

    public List<SkillInfo> skills = new List<SkillInfo>();

    // ...

    public override void Read(ArraySegment<byte> segment)
    {
        // ...

        // skill list
        skills.Clear();
        ushort skillLen = BitConverter.ToUInt16(s.Slice(count, s.Length - count));
        count += skillLen;
        for(int i = 0; i < skillLen; i++)
        {
            SkillInfo skill = new SkillInfo();
            skill.Read(s, ref count);
            skills.Add(skill);
        }

        Console.WriteLine($"Read : {this.name}");
    }
}