OPC Studio User's Guide and Reference
CanHaveNullValue Method



OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess.Extensions Namespace > DAItemPropertyRecord Class : CanHaveNullValue Method
The ID of the property to be tested.
Determines whether the given property can have a null value.
Syntax
'Declaration
 
Public Overridable Function CanHaveNullValue( _
   ByVal propertyId As DAPropertyId _
) As Boolean
'Usage
 
Dim instance As DAItemPropertyRecord
Dim propertyId As DAPropertyId
Dim value As Boolean
 
value = instance.CanHaveNullValue(propertyId)
public virtual bool CanHaveNullValue( 
   DAPropertyId propertyId
)
public:
virtual bool CanHaveNullValue( 
   DAPropertyId^ propertyId
) 

Parameters

propertyId
The ID of the property to be tested.

Return Value

Returns true if the property can have a null value; returns false otherwise.
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