OPC Studio User's Guide and Reference
EffectiveAssumeTopicTree Property (_UADataSetSubscriptionDescriptor)



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.PubSub.ComTypes Namespace > _UADataSetSubscriptionDescriptor Interface : EffectiveAssumeTopicTree Property
Determines whether the (standard) topic tree will effectively be used.
Syntax
'Declaration
 
ReadOnly Property EffectiveAssumeTopicTree As Boolean
'Usage
 
Dim instance As _UADataSetSubscriptionDescriptor
Dim value As Boolean
 
value = instance.EffectiveAssumeTopicTree
bool EffectiveAssumeTopicTree {get;}
property bool EffectiveAssumeTopicTree {
   bool get();
}

Property Value

The default value of this property is False.

Remarks

The (standard) topic tree will be effectively used if either

When all queue names (such as OpcLabs.EasyOpc.UA.PubSub.Configuration.UABrokerDataSetReaderTransportParameters.QueueName and OpcLabs.EasyOpc.UA.PubSub.Configuration.UABrokerDataSetReaderTransportParameters.MetaDataQueueName) are unspecified (empty strings, which are the default), and the EffectiveTransportProfileUriString in the ConnectionDescriptor is for transport that uses the topic tree (such as MQTT), the EffectiveAssumeTopicTree becomes true, and you do not have to set AssumeTopicTree to true explicitly in order for the topic tree to be assumed.

Using the topic tree has two major effects:

The getter method of this property is pure, i.e. it does not have observable side effects.

This member or type is for use from COM. It is not meant to be used from .NET or Python. Refer to the corresponding .NET member or type instead, if you are developing in .NET or Python.

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