class AttributeValues { public static void Main() { var easyAEClient = new EasyAEClient(); var easyDAClient = new EasyDAClient(); var eventHandler = new EasyAENotificationEventHandler(easyAEClient_Notification); easyAEClient.Notification += eventHandler; // Inactivate the event condition (we will later activate it and receive the notification) easyDAClient.WriteItemValue("", "OPCLabs.KitServer.2", "SimulateEvents.ConditionState1.Inactivate", true); var subscriptionFilter = new AESubscriptionFilter { Sources = new AENodeDescriptor[] {"Simulation.ConditionState1"} }; // Prepare a dictionary holding requested event attributes for each event category // The event category IDs and event attribute IDs are hard-coded here, but can be obtained from the OPC // server by querying as well. var returnedAttributesByCategory = new AEAttributeSetDictionary(); returnedAttributesByCategory[0x00ECFF02] = new long[] {0x00EB0003, 0x00EB0008}; Console.WriteLine("Subscribing to events..."); int handle = easyAEClient.SubscribeEvents("", "OPCLabs.KitEventServer.2", 1000, null, subscriptionFilter, returnedAttributesByCategory); // Give the refresh operation time to complete Thread.Sleep(5 * 1000); // Trigger an event carrying specified attributes (activate the condition) easyDAClient.WriteItemValue("", "OPCLabs.KitServer.2", "SimulateEvents.ConditionState1.AttributeValues.15400963", 123456); easyDAClient.WriteItemValue("", "OPCLabs.KitServer.2", "SimulateEvents.ConditionState1.AttributeValues.15400968", "Some string value"); easyDAClient.WriteItemValue("", "OPCLabs.KitServer.2", "SimulateEvents.ConditionState1.Activate", true); Console.WriteLine("Processing event notifications for 10 seconds..."); Thread.Sleep(10 * 1000); easyAEClient.UnsubscribeEvents(handle); } // Notification event handler static void easyAEClient_Notification([NotNull] object sender, [NotNull] EasyAENotificationEventArgs e) { if (!e.Refresh && (e.EventData != null)) { // Display all received event attribute IDs and their corresponding values Console.WriteLine("Event attribute count: {0}", e.EventData.AttributeValues.Count); foreach (KeyValuePair<long, object> pair in e.EventData.AttributeValues) Console.WriteLine(" {0}: {1}", pair.Key, pair.Value); } }