Apply similar fix as needed for AMQNET-298

src/main/csharp/Transport/InactivityMonitor.cs

@@ -45,6 +45,7 @@ public class InactivityMonitor : TransportFilter
         private AsyncWriteTask asyncWriteTask;
 
         private readonly Mutex monitor = new Mutex();
+        private bool disposing = false;
 
         private Timer connectionCheckTimer;
 
@@ -97,8 +98,8 @@ protected override void Dispose(bool disposing)
                 // get rid of unmanaged stuff
             }
 
+            this.disposing = true;
             StopMonitorThreads();
-
             base.Dispose(disposing);
         }
 
@@ -265,7 +266,7 @@ public override void Oneway(Command command)
 
         protected override void OnException(ITransport sender, Exception command)
         {
-            if(failed.CompareAndSet(false, true))
+            if(failed.CompareAndSet(false, true) && !this.disposing)
             {
                 Tracer.Debug("Exception received in the Inactivity Monitor: " + command.ToString());
                 StopMonitorThreads();
@@ -277,6 +278,11 @@ private void StartMonitorThreads()
         {
             lock(monitor)
             {
+                if(this.IsDisposed || this.disposing)
+                {
+                    return;
+                }
+
                 if(monitorStarted.Value)
                 {
                     return;

src/main/csharp/Transport/TransportFilter.cs

@@ -151,6 +151,8 @@ protected virtual void Dispose(bool disposing)
 		{
 			if(disposing)
 			{
+                Tracer.Debug("TransportFilter disposing of next Transport: " +
+                             this.next.GetType().Name);
 				this.next.Dispose();
 			}
 			disposed = true;
@@ -190,6 +192,7 @@ public ResumedHandler Resumed
 
 		public virtual void Stop()
 		{
+            this.next.Stop();
 		}
 
         public Object Narrow(Type type)