System.Data.SqlClient.TdsParser.WriteBulkCopyMetaData C# (CSharp) Метод

        internal void WriteBulkCopyMetaData(_SqlMetaDataSet metadataCollection, int count, TdsParserStateObject stateObj)
        {
            if (!(State == TdsParserState.OpenNotLoggedIn || State == TdsParserState.OpenLoggedIn))
            {
                throw ADP.ClosedConnectionError();
            }

            stateObj.WriteByte(TdsEnums.SQLCOLMETADATA);
            WriteShort(count, stateObj);

            for (int i = 0; i < metadataCollection.Length; i++)
            {
                if (metadataCollection[i] != null)
                {
                    _SqlMetaData md = metadataCollection[i];

                    // read user type - 4 bytes Yukon, 2 backwards
                    WriteInt(0x0, stateObj);

                    ushort flags;

                    flags = (ushort)(md.updatability << 2);
                    flags |= (ushort)(md.isNullable ? (ushort)TdsEnums.Nullable : (ushort)0);
                    flags |= (ushort)(md.isIdentity ? (ushort)TdsEnums.Identity : (ushort)0);

                    WriteShort(flags, stateObj);      // write the flags


                    switch (md.type)
                    {
                        case SqlDbType.Decimal:
                            stateObj.WriteByte(md.tdsType);
                            WriteTokenLength(md.tdsType, md.length, stateObj);
                            stateObj.WriteByte(md.precision);
                            stateObj.WriteByte(md.scale);
                            break;
                        case SqlDbType.Xml:
                            stateObj.WriteByteArray(s_xmlMetadataSubstituteSequence, s_xmlMetadataSubstituteSequence.Length, 0);
                            break;
                        case SqlDbType.Udt:
                            throw ADP.DbTypeNotSupported(SqlDbType.Udt.ToString());
                        case SqlDbType.Date:
                            stateObj.WriteByte(md.tdsType);
                            break;
                        case SqlDbType.Time:
                        case SqlDbType.DateTime2:
                        case SqlDbType.DateTimeOffset:
                            stateObj.WriteByte(md.tdsType);
                            stateObj.WriteByte(md.scale);
                            break;
                        default:
                            stateObj.WriteByte(md.tdsType);
                            WriteTokenLength(md.tdsType, md.length, stateObj);
                            if (md.metaType.IsCharType)
                            {
                                WriteUnsignedInt(md.collation.info, stateObj);
                                stateObj.WriteByte(md.collation.sortId);
                            }
                            break;
                    }

                    if (md.metaType.IsLong && !md.metaType.IsPlp)
                    {
                        WriteShort(md.tableName.Length, stateObj);
                        WriteString(md.tableName, stateObj);
                    }

                    stateObj.WriteByte((byte)md.column.Length);
                    WriteString(md.column, stateObj);
                }
            } // end for loop
        }