| Class | Description | |
|---|---|---|
 | UAAttributeDataPayload<TValue> | An event payload with an OPC-UA attribute value, together with status code and timestamps. |
| UADataChangeNotificationPayload<TValue> | An event payload for significant data change in a subscribed OPC-UA monitored item. |
This namespace contains classes used to develop StreamInsight applications with OPC Unified Architecture (OPC-UA).
Classes
Remarks
The event payload class for OPC Unified Architecture is the UADataChangeNotificationPayload<TValue>, where TValue is the type of the OPC values. This class contains an embedded UAAttributeDataPayload<TValue> object, which contains the actual OPC value, timestamps, and status. This object is always present; in case of errors, it contains default values.
In addition, there are Endpoint and Attribute string properties, identifying the source of the event. For a single OPC observable, they always contain the same value, but they become useful once you start combining events from different OPC sources into one stream.
See Also