//AbstractDBC.cs:

        public struct DBC_Header
        {
            public uint Magic;
            public uint RecordCount;
            public uint FieldCount;
            public uint RecordSize;
            public int StringBlockSize;
        };

        public class DBC_Body<RecordMap>
        {
            public RecordMap[] records;
        };

//SpellDBC.cs:

                DBCReader reader = new DBCReader("DBC/Spell.dbc");
                DBC_Header header = reader.ReadDBCHeader();
                body = new DBC_Body<Spell_DBC_RecordMap>();
                reader.ReadDBCRecords<Spell_DBC_RecordMap, Spell_DBC_Record>(body, Marshal.SizeOf(typeof(Spell_DBC_Record)));

//DBCReader.cs:

        // RecordContainer =
        /*
        public struct Spell_DBC_RecordMap
        {
            public Spell_DBC_Record record;
            public string[] spellName;
            public string[] spellRank;
            public string[] spellDesc;
            public string[] spellTool;
        };*/
        // RecordStruct = Spell_DBC_Record (3.3.5a struct)
        public void ReadDBCRecords<RecordContainer, RecordStruct>(DBC_Body<RecordContainer> body, int recordSize)
        {
            if (header.RecordSize != recordSize)
                throw new Exception($"This DBC [{ filePath }] is not supported! It's version is not 3.3.5a 12340, expected record size [{ header.RecordSize }] got [{ recordSize }].");

            body.records = new RecordContainer[header.RecordCount];
            byte[] readBuffer;
            using (FileStream fileStream = new FileStream(filePath, FileMode.Open))
            {
                using (BinaryReader reader = new BinaryReader(fileStream))
                {
                    reader.BaseStream.Position = filePosition;
                    for (uint i = 0; i < header.RecordCount; ++i)
                    {
                        readBuffer = new byte[recordSize];
                        readBuffer = reader.ReadBytes(recordSize);

                        // This line does read the data correctly and has all the correct values
                        RecordStruct record = ReadStruct<RecordStruct>(reader, readBuffer);
                        FieldInfo field = typeof(RecordContainer).GetField("record");
                        field.SetValue(body.records[i], record);
                        // The above 2 lines do not seem to update the array :(
                    }
                    filePosition = reader.BaseStream.Position;
                }
            }
        }