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

        private void WriteTvpOrderUnique(MSS.SmiExtendedMetaData metaData, TdsParserStateObject stateObj)
        {
            // TVP_ORDER_UNIQUE token (uniqueness and sort order)

            // Merge order and unique keys into a single token stream

            MSS.SmiOrderProperty orderProperty = (MSS.SmiOrderProperty)metaData.ExtendedProperties[MSS.SmiPropertySelector.SortOrder];
            MSS.SmiUniqueKeyProperty uniqueKeyProperty = (MSS.SmiUniqueKeyProperty)metaData.ExtendedProperties[MSS.SmiPropertySelector.UniqueKey];

            // Build list from
            List<TdsOrderUnique> columnList = new List<TdsOrderUnique>(metaData.FieldMetaData.Count);
            for (int i = 0; i < metaData.FieldMetaData.Count; i++)
            {
                // Add appropriate SortOrder flag
                byte flags = 0;
                MSS.SmiOrderProperty.SmiColumnOrder columnOrder = orderProperty[i];
                if (SortOrder.Ascending == columnOrder.Order)
                {
                    flags = TdsEnums.TVP_ORDERASC_FLAG;
                }
                else if (SortOrder.Descending == columnOrder.Order)
                {
                    flags = TdsEnums.TVP_ORDERDESC_FLAG;
                }

                // Add unique key flag if appropriate
                if (uniqueKeyProperty[i])
                {
                    flags |= TdsEnums.TVP_UNIQUE_FLAG;
                }

                // Remember this column if any flags were set
                if (0 != flags)
                {
                    columnList.Add(new TdsOrderUnique(checked((short)(i + 1)), flags));
                }
            }

            // Write flagged columns to wire...
            if (0 < columnList.Count)
            {
                stateObj.WriteByte(TdsEnums.TVP_ORDER_UNIQUE_TOKEN);
                WriteShort(columnList.Count, stateObj);
                foreach (TdsOrderUnique column in columnList)
                {
                    WriteShort(column.ColumnOrdinal, stateObj);
                    stateObj.WriteByte(column.Flags);
                }
            }
        }