System.Data.SqlClient.TdsParser.WriteSqlVariantDataRowValue C# (CSharp) Method

        internal Task WriteSqlVariantDataRowValue(object value, TdsParserStateObject stateObj, bool canAccumulate = true)
        {
            // handle null values
            if ((null == value) || (DBNull.Value == value))
            {
                WriteInt(TdsEnums.FIXEDNULL, stateObj);
                return null;
            }

            MetaType metatype = MetaType.GetMetaTypeFromValue(value);
            int length = 0;

            if (metatype.IsAnsiType)
            {
                length = GetEncodingCharLength((string)value, length, 0, _defaultEncoding);
            }

            switch (metatype.TDSType)
            {
                case TdsEnums.SQLFLT4:
                    WriteSqlVariantHeader(6, metatype.TDSType, metatype.PropBytes, stateObj);
                    WriteFloat((float)value, stateObj);
                    break;

                case TdsEnums.SQLFLT8:
                    WriteSqlVariantHeader(10, metatype.TDSType, metatype.PropBytes, stateObj);
                    WriteDouble((double)value, stateObj);
                    break;

                case TdsEnums.SQLINT8:
                    WriteSqlVariantHeader(10, metatype.TDSType, metatype.PropBytes, stateObj);
                    WriteLong((long)value, stateObj);
                    break;

                case TdsEnums.SQLINT4:
                    WriteSqlVariantHeader(6, metatype.TDSType, metatype.PropBytes, stateObj);
                    WriteInt((int)value, stateObj);
                    break;

                case TdsEnums.SQLINT2:
                    WriteSqlVariantHeader(4, metatype.TDSType, metatype.PropBytes, stateObj);
                    WriteShort((short)value, stateObj);
                    break;

                case TdsEnums.SQLINT1:
                    WriteSqlVariantHeader(3, metatype.TDSType, metatype.PropBytes, stateObj);
                    stateObj.WriteByte((byte)value);
                    break;

                case TdsEnums.SQLBIT:
                    WriteSqlVariantHeader(3, metatype.TDSType, metatype.PropBytes, stateObj);
                    if ((bool)value == true)
                        stateObj.WriteByte(1);
                    else
                        stateObj.WriteByte(0);

                    break;

                case TdsEnums.SQLBIGVARBINARY:
                    {
                        byte[] b = (byte[])value;

                        length = b.Length;
                        WriteSqlVariantHeader(4 + length, metatype.TDSType, metatype.PropBytes, stateObj);
                        WriteShort(length, stateObj); // propbytes: varlen
                        return stateObj.WriteByteArray(b, length, 0, canAccumulate);
                    }

                case TdsEnums.SQLBIGVARCHAR:
                    {
                        string s = (string)value;

                        length = s.Length;
                        WriteSqlVariantHeader(9 + length, metatype.TDSType, metatype.PropBytes, stateObj);
                        WriteUnsignedInt(_defaultCollation.info, stateObj); // propbytes: collation.Info
                        stateObj.WriteByte(_defaultCollation.sortId); // propbytes: collation.SortId
                        WriteShort(length, stateObj);
                        return WriteEncodingChar(s, _defaultEncoding, stateObj, canAccumulate);
                    }

                case TdsEnums.SQLUNIQUEID:
                    {
                        System.Guid guid = (System.Guid)value;
                        byte[] b = guid.ToByteArray();

                        length = b.Length;
                        Debug.Assert(length == 16, "Invalid length for guid type in com+ object");
                        WriteSqlVariantHeader(18, metatype.TDSType, metatype.PropBytes, stateObj);
                        stateObj.WriteByteArray(b, length, 0);
                        break;
                    }

                case TdsEnums.SQLNVARCHAR:
                    {
                        string s = (string)value;

                        length = s.Length * 2;
                        WriteSqlVariantHeader(9 + length, metatype.TDSType, metatype.PropBytes, stateObj);
                        WriteUnsignedInt(_defaultCollation.info, stateObj); // propbytes: collation.Info
                        stateObj.WriteByte(_defaultCollation.sortId); // propbytes: collation.SortId
                        WriteShort(length, stateObj); // propbyte: varlen

                        // string takes cchar, not cbyte so convert
                        length >>= 1;
                        return WriteString(s, length, 0, stateObj, canAccumulate);
                    }

                case TdsEnums.SQLDATETIME:
                    {
                        TdsDateTime dt = MetaType.FromDateTime((DateTime)value, 8);

                        WriteSqlVariantHeader(10, metatype.TDSType, metatype.PropBytes, stateObj);
                        WriteInt(dt.days, stateObj);
                        WriteInt(dt.time, stateObj);
                        break;
                    }

                case TdsEnums.SQLMONEY:
                    {
                        WriteSqlVariantHeader(10, metatype.TDSType, metatype.PropBytes, stateObj);
                        WriteCurrency((Decimal)value, 8, stateObj);
                        break;
                    }

                case TdsEnums.SQLNUMERICN:
                    {
                        WriteSqlVariantHeader(21, metatype.TDSType, metatype.PropBytes, stateObj);
                        stateObj.WriteByte(metatype.Precision); //propbytes: precision
                        stateObj.WriteByte((byte)((Decimal.GetBits((Decimal)value)[3] & 0x00ff0000) >> 0x10)); // propbytes: scale
                        WriteDecimal((Decimal)value, stateObj);
                        break;
                    }

                case TdsEnums.SQLTIME:
                    WriteSqlVariantHeader(8, metatype.TDSType, metatype.PropBytes, stateObj);
                    stateObj.WriteByte(metatype.Scale); //propbytes: scale
                    WriteTime((TimeSpan)value, metatype.Scale, 5, stateObj);
                    break;

                case TdsEnums.SQLDATETIMEOFFSET:
                    WriteSqlVariantHeader(13, metatype.TDSType, metatype.PropBytes, stateObj);
                    stateObj.WriteByte(metatype.Scale); //propbytes: scale
                    WriteDateTimeOffset((DateTimeOffset)value, metatype.Scale, 10, stateObj);
                    break;

                default:
                    Debug.Assert(false, "unknown tds type for sqlvariant!");
                    break;
            } // switch
            // return point for accumulated writes, note: non-accumulated writes returned from their case statements
            return null;
        }