OPC Studio User's Guide and Reference
IsNull Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.Filtering Namespace > UAFilterElements Class : IsNull Method

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

TRUE if operand[0] is a null value.
Syntax
'Declaration
 
<NotNullAttribute()>
Public Shared Function IsNull( _
   ByVal operand0 As UAFilterOperand _
) As UAContentFilterElement
'Usage
 
Dim operand0 As UAFilterOperand
Dim value As UAContentFilterElement
 
value = UAFilterElements.IsNull(operand0)
[NotNull()]
public static UAContentFilterElement IsNull( 
   UAFilterOperand operand0
)
[NotNull()]
public:
static UAContentFilterElement^ IsNull( 
   UAFilterOperand^ operand0
) 

Parameters

operand0

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

Return Value

This method never returns null (Nothing in Visual Basic).

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