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

        private bool TryProcessColInfo(_SqlMetaDataSet columns, SqlDataReader reader, TdsParserStateObject stateObj, out _SqlMetaDataSet metaData)
        {
            Debug.Assert(columns != null && columns.Length > 0, "no metadata available!");

            metaData = null;

            for (int i = 0; i < columns.Length; i++)
            {
                _SqlMetaData col = columns[i];

                byte ignored;
                if (!stateObj.TryReadByte(out ignored))
                { // colnum, ignore
                    return false;
                }
                if (!stateObj.TryReadByte(out ignored))
                { // tablenum, ignore
                    return false;
                }

                // interpret status
                byte status;
                if (!stateObj.TryReadByte(out status))
                {
                    return false;
                }

                col.isDifferentName = (TdsEnums.SQLDifferentName == (status & TdsEnums.SQLDifferentName));
                col.isExpression = (TdsEnums.SQLExpression == (status & TdsEnums.SQLExpression));
                col.isKey = (TdsEnums.SQLKey == (status & TdsEnums.SQLKey));
                col.isHidden = (TdsEnums.SQLHidden == (status & TdsEnums.SQLHidden));

                // read off the base table name if it is different than the select list column name
                if (TdsEnums.SQLDifferentName == (status & TdsEnums.SQLDifferentName))
                {
                    byte len;
                    if (!stateObj.TryReadByte(out len))
                    {
                        return false;
                    }
                    if (!stateObj.TryReadString(len, out col.baseColumn))
                    {
                        return false;
                    }
                }


                if (TdsEnums.SQLExpression == (status & TdsEnums.SQLExpression))
                {
                    col.updatability = 0;
                }
            }

            // set the metadata so that the stream knows some metadata info has changed
            metaData = columns;
            return true;
        }