Exists Method

The node ID of the security role to check.

Because the OpcLabs.EasyOpc.UA.AddressSpace.UANodeId has an implicit conversion from System.String, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a string (representing the expanded text of the nodeId) in place of this parameter, and the corresponding OPC UA node Id will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.AddressSpace.UANodeId.UANodeId Constructor(String) constructor instead.

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

Determines whether a security role with the specified role ID exists.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Shared Function Exists( _
   ByVal roleId As UANodeId _
) As Boolean

'Usage
 
Dim roleId As UANodeId
Dim value As Boolean
 
value = UASecurityRoles.Exists(roleId)

public static bool Exists( 
   UANodeId roleId
)

public:
static bool Exists( 
   UANodeId^ roleId
)

Parameters

roleId

The node ID of the security role to check.

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

Return Value

true if the security role exists; otherwise, false.

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	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.

System.ArgumentNullException

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.

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

UASecurityRoles Class
UASecurityRoles Members

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