Unhandled exception at
FirebirdSql.Data.Client.Managed.FirebirdNetworkStream.Flush()
------------------------------------------------------------------------------------
Key: DNET-1014
URL: http://tracker.firebirdsql.org/browse/DNET-1014
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 7.10.1.0
Environment: Windows 10 version 20H2
.NET Framework 4.8
Reporter: Luciano Mendes
Assignee: Jiri Cincura
ACTUAL RESULT:
Under certain conditions where network failures can happen more frequently
(high latency network), the following unhandled exception can happen:
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
FirebirdSql.Data.Common.IscException: Unable to complete network request to
host "
No message for error code 335544721 found. ---> System.IO.IOException: Unable
to write data to the transport connection: An existing connection was forcibly
closed by the remote host. ---> System.Net.Sockets.SocketException: An existing
connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size,
SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32
size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32
size)
at FirebirdSql.Data.Client.Managed.FirebirdNetworkStream.Flush()
at FirebirdSql.Data.Client.Managed.Version10.GdsStatement.DoFreePacket(Int32
option)
--- End of inner exception stack trace ---
at FirebirdSql.Data.Client.Managed.Version10.GdsStatement.DoFreePacket(Int32
option)
at FirebirdSql.Data.Client.Managed.Version11.GdsStatement.Free(Int32 option)
at FirebirdSql.Data.Common.StatementBase.Release()
at FirebirdSql.Data.Client.Managed.Version10.GdsStatement.Dispose()
at FirebirdSql.Data.FirebirdClient.FbCommand.Release()
at FirebirdSql.Data.FirebirdClient.FbCommand.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at CHRONOS.Models.Databases.FirebirdSQLDatabase.SelectProcedure(String
procedureName, String[] inputParameters, DataTable dataTable, Boolean
poolingStatus)
EXPECTED RESULT
This unhandled exception should be redirected to the FbException class.
OHTER INFORMATION
Here is the code of the procedure that the unhandled exception happens:
private static bool SelectProcedure(string procedureName, string[]
inputParameters, out DataTable dataTable, bool poolingStatus = true)
{
dataTable = new DataTable();
using (var fbConnection = new FbConnection(ConnectionString()))
using (var fbCommand = new FbCommand(procedureName, fbConnection))
try
{
Cursor.Current = Cursors.WaitCursor;
fbCommand.CommandType = CommandType.StoredProcedure;
//INPUT PARAMETERS
for (var i = 0; i < inputParameters.Length; i++)
fbCommand.Parameters.Add("@" + i,
inputParameters[i]).Direction = ParameterDirection.Input;
//OPEN CONNECTION
fbConnection.Open();
//SELECT PROCEDURE
using (var fbDataReader = fbCommand.ExecuteReader())
dataTable.Load(fbDataReader);
NotifyReconnection();
Utility.Log("SP", procedureName);
return true;
}
catch (FbException ex)
{
if (poolingStatus)
return SelectProcedure(procedureName, inputParameters,
out dataTable, false);
else NotifyException(ex);
return false;
}
finally
{
Cursor.Current = Cursors.Default;
}
}
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