OPC Studio User's Guide and Reference
HasCapability Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.Discovery.Extensions Namespace > UAApplicationElementExtension Class : HasCapability Method
The application element to be examined.
The capability identifier.
Determines whether the application supports the specified capability.
Syntax
'Declaration
 
<ExtensionAttribute()>
Public Shared Function HasCapability( _
   ByVal applicationElement As UAApplicationElement, _
   ByVal capabilityIdentifier As String _
) As Nullable(Of Boolean)
'Usage
 
Dim applicationElement As UAApplicationElement
Dim capabilityIdentifier As String
Dim value As Nullable(Of Boolean)
 
value = UAApplicationElementExtension.HasCapability(applicationElement, capabilityIdentifier)

Parameters

applicationElement
The application element to be examined.
capabilityIdentifier
The capability identifier.

Return Value

Returns true when the application described by the applicationElement supports the capability given by capabilityIdentifier. Returns false when the application described by the applicationElement does not support the capability given by capabilityIdentifier. Returns null when the capability information for the server is not available.
Exceptions
ExceptionDescription

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Remarks

The server capability identifiers are described in Annex D of OPC UA Part 12. For normative list, see http://www.opcfoundation.org/UA/schemas/1.04/ServerCapabilities.csv .

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