'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function SubscribeEvent( _
   ByVal client As IEasyUAClient, _
   ByVal endpointDescriptor As UAEndpointDescriptor, _
   ByVal nodeDescriptor As UANodeDescriptor, _
   ByVal samplingInterval As Integer, _
   ByVal eventFilter As UAEventFilter, _
   ByVal autoConditionRefresh As Boolean, _
   ByVal eventCallback As EasyUAEventNotificationEventHandler, _
   ByVal state As Object _
) As Integer

'Usage
 
Dim client As IEasyUAClient
Dim endpointDescriptor As UAEndpointDescriptor
Dim nodeDescriptor As UANodeDescriptor
Dim samplingInterval As Integer
Dim eventFilter As UAEventFilter
Dim autoConditionRefresh As Boolean
Dim eventCallback As EasyUAEventNotificationEventHandler
Dim state As Object
Dim value As Integer
 
value = IEasyUAClientExtension.SubscribeEvent(client, endpointDescriptor, nodeDescriptor, samplingInterval, eventFilter, autoConditionRefresh, eventCallback, state)

[Extension()]
public static int SubscribeEvent( 
   IEasyUAClient client,
   UAEndpointDescriptor endpointDescriptor,
   UANodeDescriptor nodeDescriptor,
   int samplingInterval,
   UAEventFilter eventFilter,
   bool autoConditionRefresh,
   EasyUAEventNotificationEventHandler eventCallback,
   object state
)

[Extension()]
public:
static int SubscribeEvent( 
   IEasyUAClient^ client,
   UAEndpointDescriptor^ endpointDescriptor,
   UANodeDescriptor^ nodeDescriptor,
   int samplingInterval,
   UAEventFilter^ eventFilter,
   bool autoConditionRefresh,
   EasyUAEventNotificationEventHandler^ eventCallback,
   Object^ state
) 

Parameters

client

The client object that will perform the operation.

endpointDescriptor

Endpoint descriptor. Identifies the OPC-UA server.

nodeDescriptor

Node descriptor. Identifies the node in OPC server's address space.

samplingInterval

The sampling interval (in milliseconds) indicates the fastest rate at which the Server should sample its underlying source for events.

eventFilter

The event filter.

autoConditionRefresh

When set, a ConditionRefresh will be automatically performed when needed to keep the condition information up-to-date.

eventCallback

A callback method to be invoked for each significant monitored item change.

state

User-defined state object.

Return Value

If eventCallback is a null reference, only the IEasyUAClient.EventNotification event is generated, and no callback method is invoked.

You can obtain nodeDescriptor e.g. by calling one of the browsing methods on EasyUAClientCore object.

You can use UAEventFilterBuilder class, or an implicit conversion of Select clauses from UAAttributeFieldCollection, to simplify creation of eventFilter.

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows