public void Close()
{
// this method will actually close the internal connection and dipose it, this
// should only be called by a non-pooled sqlconnection, or by the object pooler
// when it deems an object should be destroyed
// it's possible to have a connection finalizer, internal connection finalizer,
// and the object pool destructor calling this method at the same time, so
// we need to provide some synchronization
if (_fConnectionOpen)
{
if (Interlocked.CompareExchange(ref _lock, 1, 0) == 0)
{
if (_fConnectionOpen)
{
if (_fIsPooled)
{
// PerfCounters - on close of pooled connection, decrement count
SQL.DecrementPooledConnectionCount();
}
try {
try {
_parser.Disconnect();
// UNDONE: GC.SuppressFinalize causes a permission demand?
//GC.SuppressFinalize(_parser);
}
finally { // _connectionWeakRef=
// close will always close, even if exception is thrown
// remember to null out any object references
_connectionWeakRef = null;
_connectionOptions = null;
_parser = null;
_loginAck = null;
_fConnectionOpen = false; // mark internal connection as closed
_fUsableState = false; // mark internal connection as unusable
_pool = null;
_dtcAddress = null;
_transactionGuid = Guid.Empty;
_transactionExport = null;
// always release the lock
//Interlocked.CompareExchange(ref _lock, 0, 1);
_lock = 0;
}
}
catch { // MDAC 80973
throw;
}
}
else
{
// release lock in case where connection already closed
//Interlocked.CompareExchange(ref _lock, 0, 1);
_lock = 0;
}
}
}
}
private void EnlistNonNullDistributedTransaction(ITransaction transaction)
{
//if (AdapterSwitches.SqlPooling.TraceVerbose)
// Debug.WriteLine("SqlInternalConnection.EnlistDistributedTransaction(): Enlisting connection in distributed transaction...");
if (null == _dtcAddress)
{
_dtcAddress = _parser.GetDTCAddress(_connectionOptions.ConnectTimeout);
}
Debug.Assert(_dtcAddress != null, "SqlInternalConnection.EnlistDistributedTransaction(): dtcAddress null, error #1");
byte[] cookie = null;
int length = 0;
UnsafeNativeMethods.ITransactionExport transactionExport = null;
if (null != _transactionExport)
{
transactionExport = _transactionExport.GetITransactionExport();
}
// if the call for the cookie fails, re-obtain the DTCAddress and recall the function
if (!Transaction.GetTransactionCookie(_dtcAddress, transaction,
ref transactionExport, ref cookie,
ref length))
{
_dtcAddress = _parser.GetDTCAddress(_connectionOptions.ConnectTimeout);
Debug.Assert(_dtcAddress != null, "SqlInternalConnection.Activate(): dtcAddress null, error #2");
if (!Transaction.GetTransactionCookie(_dtcAddress, transaction,
ref transactionExport, ref cookie,
ref length))
{
throw SQL.TransactionEnlistmentError();
}
}
if (null != transactionExport)
{
_transactionExport = new TransactionExportWrapper(transactionExport);
}
else
{
_transactionExport = null;
}
// send cookie to server to finish enlistment
_parser.PropagateDistributedTransaction(cookie, length, _connectionOptions.ConnectTimeout);
}
