OPC Studio User's Guide and Reference
SubscribeDataSetField(IEasyUASubscriber,UAPubSubConnectionDescriptor,UASubscribeDataSetFilter,UADataSetFieldDescriptor,EasyUADataSetFieldMessageEventHandler) Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.PubSub Namespace > IEasyUASubscriberExtension Class > SubscribeDataSetField Method : SubscribeDataSetField(IEasyUASubscriber,UAPubSubConnectionDescriptor,UASubscribeDataSetFilter,UADataSetFieldDescriptor,EasyUADataSetFieldMessageEventHandler) Method
The subscriber object that will perform the operation.
The PubSub connection descriptor.
Specifies how the incoming PubSub messages should be filtered before being delivered to the application.
The descriptor for the dataset field.
A callback method to be invoked for each time a dataset field is received.
Subscribes to a single dataset field from a dataset, using a PubSub connection descriptor, specified filter, a field name, and a callback.
Syntax

Parameters

subscriber
The subscriber object that will perform the operation.
pubSubConnectionDescriptor
The PubSub connection descriptor.
subscribeDataSetFilter
Specifies how the incoming PubSub messages should be filtered before being delivered to the application.
dataSetFieldDescriptor
The descriptor for the dataset field.
callback
A callback method to be invoked for each time a dataset field is received.

Return Value

Returns a dataset field subscription handle that can be used to change the subscription, obtain its arguments, or unsubscribe.
Exceptions
ExceptionDescription

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Remarks

There is no corresponding method in COM.

Requirements

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

See Also