System.Data.SqlClient.TdsParser.WriteParameterVarLen C# (CSharp) Méthode

        internal void WriteParameterVarLen(MetaType type, int size, bool isNull, TdsParserStateObject stateObj, bool unknownLength = false)
        {
            if (type.IsLong)
            { // text/image/SQLVariant have a 4 byte length, plp datatypes have 8 byte lengths
                if (isNull)
                {
                    if (type.IsPlp)
                    {
                        WriteLong(unchecked((long)TdsEnums.SQL_PLP_NULL), stateObj);
                    }
                    else
                    {
                        WriteInt(unchecked((int)TdsEnums.VARLONGNULL), stateObj);
                    }
                }
                else if (type.NullableType == TdsEnums.SQLXMLTYPE || unknownLength)
                {
                    WriteUnsignedLong(TdsEnums.SQL_PLP_UNKNOWNLEN, stateObj);
                }
                else if (type.IsPlp)
                {
                    // Non-xml plp types
                    WriteLong((long)size, stateObj);
                }
                else
                {
                    WriteInt(size, stateObj);
                }
            }
            else if (type.IsVarTime)
            {
                if (isNull)
                {
                    stateObj.WriteByte(TdsEnums.FIXEDNULL);
                }
                else
                {
                    stateObj.WriteByte((byte)size);
                }
            }
            else if (false == type.IsFixed)
            { // non-long but variable length column, must be a BIG* type: 2 byte length
                if (isNull)
                {
                    WriteShort(TdsEnums.VARNULL, stateObj);
                }
                else
                {
                    WriteShort(size, stateObj);
                }
            }
            else
            {
                if (isNull)
                {
                    stateObj.WriteByte(TdsEnums.FIXEDNULL);
                }
                else
                {
                    Debug.Assert(type.FixedLength <= 0xff, "WriteParameterVarLen: invalid one byte length!");
                    stateObj.WriteByte((byte)(type.FixedLength & 0xff)); // 1 byte for everything else
                }
            }
        }