OPC Studio User's Guide and Reference
UAFolder Constructor(String)
Example 



OpcLabs.ServerOpcUA Assembly > OpcLabs.EasyOpc.UA.NodeSpace Namespace > UAFolder Class > UAFolder Constructor : UAFolder Constructor(String)
The name of the folder.

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

Initializes a new instance of the class, with given folder name.
Syntax
'Declaration
 
Public Function New( _
   ByVal name As String _
)
'Usage
 
Dim name As String
 
Dim instance As New UAFolder(name)
public UAFolder( 
   string name
)
public:
UAFolder( 
   String^ name
)

Parameters

name
The name of the folder.

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

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.

Example
// This example shows how to folders nested in another folders.
// You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. 
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-CSharp .
// Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
// a commercial license in order to use Online Forums, and we reply to every post.

using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.NodeSpace;

namespace UAServerDocExamples._UAFolder
{
    class _Building
    {
        public static void Nested()
        {
            // Instantiate the server object.
            // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            var server = new EasyUAServer();

            // Create a structure where a folder contains another folders, and the nested folders contains data variables.
            server.Add(new UAFolder("Folder1")
            {
                new UAFolder("NestedFolder1")
                {
                    new UADataVariable("Constant").ConstantValue(42)
                },
                new UAFolder("NestedFolder2"),
                new UADataVariable("Constant").ConstantValue("abc")
            });
            server.Add(new UAFolder("Folder2"));

            // Start the server.
            Console.WriteLine("The server is starting...");
            server.Start();

            Console.WriteLine("The server is started.");
            Console.WriteLine();

            // Let the user decide when to stop.
            Console.WriteLine("Press Enter to stop the server...");
            Console.ReadLine();

            // Stop the server.
            Console.WriteLine("The server is stopping...");
            server.Stop();

            Console.WriteLine("The server is stopped.");
        }
    }
}
' This example shows how to folders nested in another folders.
' You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. 
'
' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET .
' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
' a commercial license in order to use Online Forums, and we reply to every post.

Imports System
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.NodeSpace

Namespace _UAFolder
    Partial Friend Class _Building
        Shared Sub Nested()
            ' Instantiate the server object.
            ' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            Dim server = New EasyUAServer()

            ' Create a structure where a folder contains another folders, and the nested folders contains data variables.
            server.Add(New UAFolder("UAFolder") From
            {
                New UAFolder("NestedFolder1") From
                {
                    New UADataVariable("Constant").ConstantValue(42)
                },
                New UAFolder("NestedFolder2"),
                New UADataVariable("Constant").ConstantValue("abc")
            })
            server.Add(New UAFolder("Folder2"))

            ' Start the server.
            Console.WriteLine("The server is starting...")
            server.Start()

            Console.WriteLine("The server is started.")
            Console.WriteLine()

            ' Let the user decide when to stop.
            Console.WriteLine("Press Enter to stop the server...")
            Console.ReadLine()

            ' Stop the server.
            Console.WriteLine("The server is stopping...")
            server.Stop()

            Console.WriteLine("The server is stopped.")
        End Sub
    End Class
End Namespace
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