override public void Close()
{
ConnectionState previousState = State;
Guid operationId;
Guid clientConnectionId;
// during the call to Dispose() there is a redundant call to
// Close(). because of this, the second time Close() is invoked the
// connection is already in a closed state. this doesn't seem to be a
// problem except for logging, as we'll get duplicate Before/After/Error
// log entries
if (previousState != ConnectionState.Closed)
{
operationId = s_diagnosticListener.WriteConnectionCloseBefore(this);
// we want to cache the ClientConnectionId for After/Error logging, as when the connection
// is closed then we will lose this identifier
//
// note: caching this is only for diagnostics logging purposes
clientConnectionId = ClientConnectionId;
}
SqlStatistics statistics = null;
Exception e = null;
try
{
statistics = SqlStatistics.StartTimer(Statistics);
Task reconnectTask = _currentReconnectionTask;
if (reconnectTask != null && !reconnectTask.IsCompleted)
{
CancellationTokenSource cts = _reconnectionCancellationSource;
if (cts != null)
{
cts.Cancel();
}
AsyncHelper.WaitForCompletion(reconnectTask, 0, null, rethrowExceptions: false); // we do not need to deal with possible exceptions in reconnection
if (State != ConnectionState.Open)
{ // if we cancelled before the connection was opened
OnStateChange(DbConnectionInternal.StateChangeClosed);
}
}
CancelOpenAndWait();
CloseInnerConnection();
GC.SuppressFinalize(this);
if (null != Statistics)
{
ADP.TimerCurrent(out _statistics._closeTimestamp);
}
}
catch (Exception ex)
{
e = ex;
throw;
}
finally
{
SqlStatistics.StopTimer(statistics);
// we only want to log this if the previous state of the
// connection is open, as that's the valid use-case
if (previousState != ConnectionState.Closed)
{
if (e != null)
{
s_diagnosticListener.WriteConnectionCloseError(operationId, clientConnectionId, this, e);
}
else
{
s_diagnosticListener.WriteConnectionCloseAfter(operationId, clientConnectionId, this);
}
}
}
}