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



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.PubSub.ComTypes Namespace > _UADataSetSubscriptionDescriptor Interface : TopicPrefixHead Property
The head of the prefix used in topic name construction.
Syntax
'Declaration
 
<NotNullAttribute()>
Property TopicPrefixHead As String
'Usage
 
Dim instance As _UADataSetSubscriptionDescriptor
Dim value As String
 
instance.TopicPrefixHead = value
 
value = instance.TopicPrefixHead
[NotNull()]
string TopicPrefixHead {get; set;}
[NotNull()]
property String^ TopicPrefixHead {
   String^ get();
   void set (    String^ value);
}

Property Value

This value of this property can be null (Nothing in Visual Basic).

The value of this property cannot be null (Nothing in Visual Basic).

The default value of this property is "opcua".

Remarks

The default value, given by the OPC UA specification, is "opcua".

An empty string denotes that in the topic tree, any value can be present at this topic level.

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