IsNull Property (_DAPropertyId)

Determines whether the property Id is null.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
ReadOnly Property IsNull As Boolean

'Usage
 
Dim instance As _DAPropertyId
Dim value As Boolean
 
value = instance.IsNull

bool IsNull {get;}

property bool IsNull {
   bool get();
}

Remarks

An OPC "Classic" property Id is considered null when its internal value is OpcLabs.EasyOpc.DataAccess.DAPropertyIds.Null, i.e. equal to -1.

This method or property does not throw any exceptions, aside from execution exceptions such as System.Threading.ThreadAbortException or System.OutOfMemoryException.

Requirements

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

Reference

_DAPropertyId Interface
_DAPropertyId Members

Send Documentation Feedback. Resources: Knowledge Base. Technical support: Online Forums, FAQ.