Port PR 34711 changes from corefx (#232)

Author: Wraith2

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

@@ -671,67 +671,71 @@ override public void Prepare()
             // between entry into Execute* API and the thread obtaining the stateObject.
             _pendingCancel = false;
 
-
             SqlStatistics statistics = null;
-            statistics = SqlStatistics.StartTimer(Statistics);
+            try
+            {
+                statistics = SqlStatistics.StartTimer(Statistics);
 
-            // only prepare if batch with parameters
-            if (
-                this.IsPrepared && !this.IsDirty
-                || (this.CommandType == CommandType.StoredProcedure)
-                || (
-                        (System.Data.CommandType.Text == this.CommandType)
-                        && (0 == GetParameterCount(_parameters))
-                    )
+                // only prepare if batch with parameters
+                if (
+                    this.IsPrepared && !this.IsDirty
+                    || (this.CommandType == CommandType.StoredProcedure)
+                    || (
+                            (System.Data.CommandType.Text == this.CommandType)
+                            && (0 == GetParameterCount(_parameters))
+                        )
 
-            )
-            {
-                if (null != Statistics)
+                )
                 {
-                    Statistics.SafeIncrement(ref Statistics._prepares);
+                    if (null != Statistics)
+                    {
+                        Statistics.SafeIncrement(ref Statistics._prepares);
+                    }
+                    _hiddenPrepare = false;
                 }
-                _hiddenPrepare = false;
-            }
-            else
-            {
-                // Validate the command outside of the try\catch to avoid putting the _stateObj on error
-                ValidateCommand(isAsync: false);
-
-                bool processFinallyBlock = true;
-                try
+                else
                 {
-                    // NOTE: The state object isn't actually needed for this, but it is still here for back-compat (since it does a bunch of checks)
-                    GetStateObject();
+                    // Validate the command outside of the try\catch to avoid putting the _stateObj on error
+                    ValidateCommand(isAsync: false);
 
-                    // Loop through parameters ensuring that we do not have unspecified types, sizes, scales, or precisions
-                    if (null != _parameters)
+                    bool processFinallyBlock = true;
+                    try
                     {
-                        int count = _parameters.Count;
-                        for (int i = 0; i < count; ++i)
+                        // NOTE: The state object isn't actually needed for this, but it is still here for back-compat (since it does a bunch of checks)
+                        GetStateObject();
+
+                        // Loop through parameters ensuring that we do not have unspecified types, sizes, scales, or precisions
+                        if (null != _parameters)
                         {
-                            _parameters[i].Prepare(this);
+                            int count = _parameters.Count;
+                            for (int i = 0; i < count; ++i)
+                            {
+                                _parameters[i].Prepare(this);
+                            }
                         }
-                    }
 
-                    InternalPrepare();
-                }
-                catch (Exception e)
-                {
-                    processFinallyBlock = ADP.IsCatchableExceptionType(e);
-                    throw;
-                }
-                finally
-                {
-                    if (processFinallyBlock)
+                        InternalPrepare();
+                    }
+                    catch (Exception e)
+                    {
+                        processFinallyBlock = ADP.IsCatchableExceptionType(e);
+                        throw;
+                    }
+                    finally
                     {
-                        _hiddenPrepare = false; // The command is now officially prepared
+                        if (processFinallyBlock)
+                        {
+                            _hiddenPrepare = false; // The command is now officially prepared
 
-                        ReliablePutStateObject();
+                            ReliablePutStateObject();
+                        }
                     }
                 }
             }
-
-            SqlStatistics.StopTimer(statistics);
+            finally
+            {
+                SqlStatistics.StopTimer(statistics);
+            }
         }
 
         private void InternalPrepare()

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

@@ -1018,6 +1018,12 @@ internal void Disconnect()
                     _pMarsPhysicalConObj = null;
                 }
             }
+
+            _resetConnectionEvent?.Dispose();
+            _resetConnectionEvent = null;
+
+            _defaultEncoding = null;
+            _defaultCollation = null;
         }
 
         // Fires a single InfoMessageEvent