IsNull Property (DAPropertyId)

Determines whether the property Id is null.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<DefaultValueAttribute(True)>
Public ReadOnly Property IsNull As Boolean

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

[DefaultValue(true)]
public bool IsNull {get;}

[DefaultValue(true)]
public:
property bool IsNull {
   bool get();
}

Remarks

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

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012, Windows Server 2016; .NET Core, .NET 5, .NET 6: Linux, macOS, Microsoft Windows

Reference

DAPropertyId Class
DAPropertyId Members