Opc.Ua.Server.Subscription.Delete C# (CSharp) Method

		public void Delete(OperationContext context)
        {
            // delete the diagnostics.
            if (m_diagnosticsId != null && !m_diagnosticsId.IsNullNodeId)
            {
                ServerSystemContext systemContext = m_server.DefaultSystemContext.Copy(m_session);
                m_server.DiagnosticsNodeManager.DeleteSubscriptionDiagnostics(systemContext, m_diagnosticsId);
            }

            lock (m_lock)
            {   
                try
                {        
                    // TraceState("DELETED");

                    // the context may be null if the server is cleaning up expired subscriptions.
                    // in this case we create a context with a dummy request and use the current session.
                    if (context == null)
                    {
                        RequestHeader requestHeader = new RequestHeader();
                        requestHeader.ReturnDiagnostics = (uint)(int)DiagnosticsMasks.OperationSymbolicIdAndText;
                        context = new OperationContext(requestHeader, RequestType.Unknown);
                    }

                    StatusCodeCollection results;
                    DiagnosticInfoCollection diagnosticInfos;

                    DeleteMonitoredItems(
                        context,
                        new UInt32Collection(m_monitoredItems.Keys),
                        true,
                        out results,
                        out diagnosticInfos);
                }
                catch (Exception e)
                {
                    Utils.Trace(e, "Delete items for subscription failed.");
                }
            }
        }