I merged more methods from TdsParserStateObject after dotnet#1520 It would maybe help to start working on fix the async bug.

Author: Benjamin Hugot

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs

@@ -860,7 +860,7 @@ private bool TryCleanPartialRead()
             }
 
 #if DEBUG
-            if (_stateObj._pendingData)
+            if (_stateObj.HasPendingData)
             {
                 byte token;
                 if (!_stateObj.TryPeekByte(out token))
@@ -1067,7 +1067,7 @@ private bool TryCloseInternal(bool closeReader)
 #else
                 {
 #endif //DEBUG
-                    if ((!_isClosed) && (parser != null) && (stateObj != null) && (stateObj._pendingData))
+                    if ((!_isClosed) && (parser != null) && (stateObj != null) && (stateObj.HasPendingData))
                     {
 
                         // It is possible for this to be called during connection close on a
@@ -1333,7 +1333,7 @@ private bool TryConsumeMetaData()
         {
             // warning:  Don't check the MetaData property within this function
             // warning:  as it will be a reentrant call
-            while (_parser != null && _stateObj != null && _stateObj._pendingData && !_metaDataConsumed)
+            while (_parser != null && _stateObj != null && _stateObj.HasPendingData && !_metaDataConsumed)
             {
                 if (_parser.State == TdsParserState.Broken || _parser.State == TdsParserState.Closed)
                 {
@@ -3473,7 +3473,7 @@ private bool TryHasMoreResults(out bool moreResults)
 
                 Debug.Assert(null != _command, "unexpected null command from the data reader!");
 
-                while (_stateObj._pendingData)
+                while (_stateObj.HasPendingData)
                 {
                     byte token;
                     if (!_stateObj.TryPeekByte(out token))
@@ -3563,7 +3563,7 @@ private bool TryHasMoreRows(out bool moreRows)
                         moreRows = false;
                         return true;
                 }
-                if (_stateObj._pendingData)
+                if (_stateObj.HasPendingData)
                 {
                     // Consume error's, info's, done's on HasMoreRows, so user obtains error on Read.
                     // Previous bug where Read() would return false with error on the wire in the case
@@ -3620,7 +3620,7 @@ private bool TryHasMoreRows(out bool moreRows)
                             moreRows = false;
                             return false;
                         }
-                        if (_stateObj._pendingData)
+                        if (_stateObj.HasPendingData)
                         {
                             if (!_stateObj.TryPeekByte(out b))
                             {
@@ -3964,7 +3964,7 @@ private bool TryReadInternal(bool setTimeout, out bool more)
                                 if (moreRows)
                                 {
                                     // read the row from the backend (unless it's an altrow were the marker is already inside the altrow ...)
-                                    while (_stateObj._pendingData)
+                                    while (_stateObj.HasPendingData)
                                     {
                                         if (_altRowStatus != ALTROWSTATUS.AltRow)
                                         {
@@ -3996,7 +3996,7 @@ private bool TryReadInternal(bool setTimeout, out bool more)
                                     }
                                 }
 
-                                if (!_stateObj._pendingData)
+                                if (!_stateObj.HasPendingData)
                                 {
                                     if (!TryCloseInternal(false /*closeReader*/))
                                     {
@@ -4020,7 +4020,7 @@ private bool TryReadInternal(bool setTimeout, out bool more)
                                 {
                                     // if we are in SingleRow mode, and we've read the first row,
                                     // read the rest of the rows, if any
-                                    while (_stateObj._pendingData && !_sharedState._dataReady)
+                                    while (_stateObj.HasPendingData && !_sharedState._dataReady)
                                     {
                                         if (!_parser.TryRun(RunBehavior.ReturnImmediately, _command, this, null, _stateObj, out _sharedState._dataReady))
                                         {
@@ -4061,7 +4061,7 @@ private bool TryReadInternal(bool setTimeout, out bool more)
                         more = false;
 
 #if DEBUG
-                        if ((!_sharedState._dataReady) && (_stateObj._pendingData))
+                        if ((!_sharedState._dataReady) && (_stateObj.HasPendingData))
                         {
                             byte token;
                             if (!_stateObj.TryPeekByte(out token))

src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/SqlDataReader.cs

@@ -910,11 +910,11 @@ override internal void ValidateConnectionForExecute(SqlCommand command)
                     // or if MARS is off, then a datareader exists
                     throw ADP.OpenReaderExists(parser.MARSOn); // MDAC 66411
                 }
-                else if (!parser.MARSOn && parser._physicalStateObj._pendingData)
+                else if (!parser.MARSOn && parser._physicalStateObj.HasPendingData)
                 {
                     parser.DrainData(parser._physicalStateObj);
                 }
-                Debug.Assert(!parser._physicalStateObj._pendingData, "Should not have a busy physicalStateObject at this point!");
+                Debug.Assert(!parser._physicalStateObj.HasPendingData, "Should not have a busy physicalStateObject at this point!");
 
                 parser.RollbackOrphanedAPITransactions();
             }
@@ -1073,7 +1073,7 @@ private void ResetConnection()
             // obtains a clone.
 
             Debug.Assert(!HasLocalTransactionFromAPI, "Upon ResetConnection SqlInternalConnectionTds has a currently ongoing local transaction.");
-            Debug.Assert(!_parser._physicalStateObj._pendingData, "Upon ResetConnection SqlInternalConnectionTds has pending data.");
+            Debug.Assert(!_parser._physicalStateObj.HasPendingData, "Upon ResetConnection SqlInternalConnectionTds has pending data.");
 
             if (_fResetConnection)
             {

src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/SqlInternalConnectionTds.cs

@@ -964,7 +964,7 @@ internal TdsParserStateObject GetSession(object owner)
             {
                 session = _sessionPool.GetSession(owner);
 
-                Debug.Assert(!session._pendingData, "pending data on a pooled MARS session");
+                Debug.Assert(!session.HasPendingData, "pending data on a pooled MARS session");
                 SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.TdsParser.GetSession|ADV> {0} getting session {1} from pool", ObjectID, session.ObjectID);
             }
             else
@@ -1598,7 +1598,7 @@ internal void Deactivate(bool connectionIsDoomed)
 
             if (!connectionIsDoomed && null != _physicalStateObj)
             {
-                if (_physicalStateObj._pendingData)
+                if (_physicalStateObj.HasPendingData)
                 {
                     DrainData(_physicalStateObj);
                 }
@@ -2479,7 +2479,7 @@ internal bool TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataRead
                         {
                             if (token == TdsEnums.SQLERROR)
                             {
-                                stateObj._errorTokenReceived = true; // Keep track of the fact error token was received - for Done processing.
+                                stateObj.HasReceivedError = true; // Keep track of the fact error token was received - for Done processing.
                             }
 
                             SqlError error;
@@ -3009,18 +3009,18 @@ internal bool TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataRead
                         break;
                 }
 
-                Debug.Assert(stateObj._pendingData || !dataReady, "dataReady is set, but there is no pending data");
+                Debug.Assert(stateObj.HasPendingData || !dataReady, "dataReady is set, but there is no pending data");
             }
 
             // Loop while data pending & runbehavior not return immediately, OR
             // if in attention case, loop while no more pending data & attention has not yet been
             // received.
-            while ((stateObj._pendingData &&
+            while ((stateObj.HasPendingData &&
                     (RunBehavior.ReturnImmediately != (RunBehavior.ReturnImmediately & runBehavior))) ||
-                (!stateObj._pendingData && stateObj._attentionSent && !stateObj._attentionReceived));
+                (!stateObj.HasPendingData && stateObj._attentionSent && !stateObj.HasReceivedAttention));
 
 #if DEBUG
-            if ((stateObj._pendingData) && (!dataReady))
+            if ((stateObj.HasPendingData) && (!dataReady))
             {
                 byte token;
                 if (!stateObj.TryPeekByte(out token))
@@ -3031,7 +3031,7 @@ internal bool TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataRead
             }
 #endif
 
-            if (!stateObj._pendingData)
+            if (!stateObj.HasPendingData)
             {
                 if (null != CurrentTransaction)
                 {
@@ -3041,7 +3041,7 @@ internal bool TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataRead
 
             // if we recieved an attention (but this thread didn't send it) then
             // we throw an Operation Cancelled error
-            if (stateObj._attentionReceived)
+            if (stateObj.HasReceivedAttention)
             {
                 // Dev11 #344723: SqlClient stress test suspends System_Data!Tcp::ReadSync via a call to SqlDataReader::Close
                 // Spin until SendAttention has cleared _attentionSending, this prevents a race condition between receiving the attention ACK and setting _attentionSent
@@ -3052,7 +3052,7 @@ internal bool TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataRead
                 {
                     // Reset attention state.
                     stateObj._attentionSent = false;
-                    stateObj._attentionReceived = false;
+                    stateObj.HasReceivedAttention = false;
 
                     if (RunBehavior.Clean != (RunBehavior.Clean & runBehavior) && !stateObj.IsTimeoutStateExpired)
                     {
@@ -3518,7 +3518,7 @@ private bool TryProcessDone(SqlCommand cmd, SqlDataReader reader, ref RunBehavio
             {
                 Debug.Assert(TdsEnums.DONE_MORE != (status & TdsEnums.DONE_MORE), "Not expecting DONE_MORE when receiving DONE_ATTN");
                 Debug.Assert(stateObj._attentionSent, "Received attention done without sending one!");
-                stateObj._attentionReceived = true;
+                stateObj.HasReceivedAttention = true;
                 Debug.Assert(stateObj._inBytesUsed == stateObj._inBytesRead && stateObj._inBytesPacket == 0, "DONE_ATTN received with more data left on wire");
             }
             if ((null != cmd) && (TdsEnums.DONE_COUNT == (status & TdsEnums.DONE_COUNT)))
@@ -3537,13 +3537,13 @@ private bool TryProcessDone(SqlCommand cmd, SqlDataReader reader, ref RunBehavio
                 }
 
                 // Skip the bogus DONE counts sent by the server
-                if (stateObj._receivedColMetaData || (curCmd != TdsEnums.SELECT))
+                if (stateObj.HasReceivedColumnMetadata || (curCmd != TdsEnums.SELECT))
                 {
                     cmd.OnStatementCompleted(count);
                 }
             }
 
-            stateObj._receivedColMetaData = false;
+            stateObj.HasReceivedColumnMetadata = false;
 
             // Surface exception for DONE_ERROR in the case we did not receive an error token
             // in the stream, but an error occurred.  In these cases, we throw a general server error.  The
@@ -3552,7 +3552,7 @@ private bool TryProcessDone(SqlCommand cmd, SqlDataReader reader, ref RunBehavio
             // the server has reached its max connection limit.  Bottom line, we need to throw general
             // error in the cases where we did not receive a error token along with the DONE_ERROR.
             if ((TdsEnums.DONE_ERROR == (TdsEnums.DONE_ERROR & status)) && stateObj.ErrorCount == 0 &&
-                  stateObj._errorTokenReceived == false && (RunBehavior.Clean != (RunBehavior.Clean & run)))
+                  stateObj.HasReceivedError == false && (RunBehavior.Clean != (RunBehavior.Clean & run)))
             {
                 stateObj.AddError(new SqlError(0, 0, TdsEnums.MIN_ERROR_CLASS, _server, SQLMessage.SevereError(), "", 0));
 
@@ -3586,17 +3586,17 @@ private bool TryProcessDone(SqlCommand cmd, SqlDataReader reader, ref RunBehavio
             // stop if the DONE_MORE bit isn't set (see above for attention handling)
             if (TdsEnums.DONE_MORE != (status & TdsEnums.DONE_MORE))
             {
-                stateObj._errorTokenReceived = false;
+                stateObj.HasReceivedError = false;
                 if (stateObj._inBytesUsed >= stateObj._inBytesRead)
                 {
-                    stateObj._pendingData = false;
+                    stateObj.HasPendingData = false;
                 }
             }
 
-            // _pendingData set by e.g. 'TdsExecuteSQLBatch'
-            // _hasOpenResult always set to true by 'WriteMarsHeader'
+            // HasPendingData set by e.g. 'TdsExecuteSQLBatch'
+            // HasOpenResult always set to true by 'WriteMarsHeader'
             //
-            if (!stateObj._pendingData && stateObj._hasOpenResult)
+            if (!stateObj.HasPendingData && stateObj.HasOpenResult)
             {
                 /*
                                 Debug.Assert(!((sqlTransaction != null               && _distributedTransaction != null) ||
@@ -5140,7 +5140,7 @@ internal void ThrowUnsupportedCollationEncountered(TdsParserStateObject stateObj
             {
                 DrainData(stateObj);
 
-                stateObj._pendingData = false;
+                stateObj.HasPendingData = false;
             }
 
             ThrowExceptionAndWarning(stateObj);
@@ -5742,7 +5742,7 @@ private bool TryCommonProcessMetaData(TdsParserStateObject stateObj, _SqlMetaDat
 
             // We get too many DONE COUNTs from the server, causing too meany StatementCompleted event firings.
             // We only need to fire this event when we actually have a meta data stream with 0 or more rows.
-            stateObj._receivedColMetaData = true;
+            stateObj.HasReceivedColumnMetadata = true;
             return true;
         }
 
@@ -9340,8 +9340,8 @@ internal void TdsLogin(SqlLogin rec,
             }
 
             _physicalStateObj.WritePacket(TdsEnums.HARDFLUSH);
-            _physicalStateObj.ResetSecurePasswordsInfomation();     // Password information is needed only from Login process; done with writing login packet and should clear information
-            _physicalStateObj._pendingData = true;
+            _physicalStateObj.ResetSecurePasswordsInformation();     // Password information is needed only from Login process; done with writing login packet and should clear information
+            _physicalStateObj.HasPendingData = true;
             _physicalStateObj._messageStatus = 0;
 
             // Remvove CTAIP Provider after login record is sent.
@@ -9389,7 +9389,7 @@ internal void SendFedAuthToken(SqlFedAuthToken fedAuthToken)
             _physicalStateObj.WriteByteArray(accessToken, accessToken.Length, 0);
 
             _physicalStateObj.WritePacket(TdsEnums.HARDFLUSH);
-            _physicalStateObj._pendingData = true;
+            _physicalStateObj.HasPendingData = true;
             _physicalStateObj._messageStatus = 0;
 
             _connHandler._federatedAuthenticationRequested = true;
@@ -9701,7 +9701,7 @@ internal SqlDataReader TdsExecuteTransactionManagerRequest(
 
                 Task writeTask = stateObj.WritePacket(TdsEnums.HARDFLUSH);
                 Debug.Assert(writeTask == null, "Writes should not pend when writing sync");
-                stateObj._pendingData = true;
+                stateObj.HasPendingData = true;
                 stateObj._messageStatus = 0;
 
                 SqlDataReader dtcReader = null;
@@ -11223,7 +11223,7 @@ internal Task WriteBulkCopyDone(TdsParserStateObject stateObj)
             WriteShort(0, stateObj);
             WriteInt(0, stateObj);
 
-            stateObj._pendingData = true;
+            stateObj.HasPendingData = true;
             stateObj._messageStatus = 0;
             return stateObj.WritePacket(TdsEnums.HARDFLUSH);
         }