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



OpcLabs.ServerOpcUAComponents Assembly > OpcLabs.EasyOpc.UA Namespace > EasyUAServer Class > EasyUAServer Constructor : EasyUAServer Constructor()
Initializes a new instance of the class, with default values.
Syntax
'Declaration
 
Public Function New()
'Usage
 
Dim instance As New EasyUAServer()
public EasyUAServer()
public:
EasyUAServer();
Remarks

The default server endpoint address is "opc.tcp://localhost:48040/".

This method or property does not throw any exceptions, aside from execution exceptions such as System.Threading.ThreadAbortException or System.OutOfMemoryException.

Example
// This example shows how to create an OPC UA server with a single data variable, start and stop it.
// 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._EasyUAServer
{
    class Start_Stop
    {
        public static void Main1()
        {
            // Instantiate the server object.
            // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            var server = new EasyUAServer();

            // Define a data variable providing random integers.
            var random = new Random();
            server.Add(new UADataVariable("MyDataVariable").ReadValueFunction(() => random.Next()));

            // 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 create an OPC UA server with a single data variable, start and stop it.
' 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 _EasyUAServer
    Partial Friend Class Start_Stop
        Shared Sub Main1()
            ' Instantiate the server object.
            ' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            Dim server = New EasyUAServer()

            ' Define a data variable providing random integers.
            Dim random = New Random()
            server.Add(New UADataVariable("MyDataVariable").ReadValueFunction(Function() random.Next()))

            ' 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
// This example shows how to use the IDisposable interface to automatically stop the OPC UA server.
// 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._EasyUAServer
{
    class Dispose
    {
        public static void Main1()
        {
            // Instantiate the server object.
            // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            //
            // The "using" statement ensures disposal of the resource it acquires.
            using (var server = new EasyUAServer())
            {
                // Define a data variable providing random integers.
                var random = new Random();
                server.Add(new UADataVariable("MyDataVariable").ReadValueFunction(() => random.Next()));

                // 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();

                // The IDisposable.Dispose call (automatically made at the end of the "using" statement) stops the
                // EasyUAServer if it is started.
                Console.WriteLine("The server is stopping...");
            }
            Console.WriteLine("The server is stopped.");
        }
    }
}
' This example shows how to use the IDisposable interface to automatically stop the OPC UA server.
' 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.AlarmsAndEvents
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.NodeSpace

Namespace _EasyUAServer
    Partial Friend Class Dispose
        Shared Sub Main1()
            ' Instantiate the server object.
            ' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            ' 
            ' The "Using" statement ensures disposal of the resource it acquires.
            Using server = New EasyUAServer()
                ' Define a data variable providing random integers.
                Dim random = New Random()
                server.Add(New UADataVariable("MyDataVariable").ReadValueFunction(Function() random.Next()))

                ' 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()

                ' The IDisposable.Dispose call (automatically made at the end of the "using" statement) stops the
                ' EasyUAServer if it is started.
                Console.WriteLine("The server is stopping...")
            End Using
        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