QuickOPC User's Guide and Reference
RefreshTrustLists Method (IEasyUAApplication)
Example 



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.Application Namespace > IEasyUAApplication Interface : RefreshTrustLists Method
The GDS endpoint acting as OPC UA certificate manager (CM).
Retrieves the current trust lists for the application from the certificate manager, and refreshes own certificate stores accordingly.
Syntax
'Declaration
 
Function RefreshTrustLists( _
   ByVal gdsEndpointDescriptor As UAEndpointDescriptor _
) As UATrustListMasks
'Usage
 
Dim instance As IEasyUAApplication
Dim gdsEndpointDescriptor As UAEndpointDescriptor
Dim value As UATrustListMasks
 
value = instance.RefreshTrustLists(gdsEndpointDescriptor)

Parameters

gdsEndpointDescriptor
The GDS endpoint acting as OPC UA certificate manager (CM).

Return Value

Returns a bit mask indicating which trust lists have been refreshed.
Exceptions
ExceptionDescription
A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.
The OPC UA operation has failed.
Remarks

The operation first updates the application's registration in the GDS, before retrieving the trust lists from the certificate manager and adding them to the certificate stores.

Example
// Shows how to refresh own certificate stores using current trust lists for the application from the certificate manager.

using System;
using Microsoft.Extensions.DependencyInjection;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.Application;
using OpcLabs.EasyOpc.UA.Application.Extensions;
using OpcLabs.EasyOpc.UA.Extensions;
using OpcLabs.EasyOpc.UA.Gds;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples.Application._IEasyUAClientApplication
{
    class RefreshTrustLists
    {
        public static void Main1()
        {
            // Define which GDS we will work with.
            UAEndpointDescriptor gdsEndpointDescriptor =
                ((UAEndpointDescriptor)"opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer")
                .WithUserNameIdentity("appadmin", "demo");

            // Obtain the client application service.
            var client = new EasyUAClient();
            IEasyUAClientApplication clientApplication = client.GetService<IEasyUAClientApplication>();

            // Display which application we are about to work with.
            Console.WriteLine("Application URI string: {0}",
                clientApplication.GetApplicationElement().ApplicationUriString);

            // Refresh own certificate stores using current trust lists for the application from the certificate manager.
            UATrustListMasks refreshedTrustLists;
            try
            {
                refreshedTrustLists = clientApplication.RefreshTrustLists(gdsEndpointDescriptor);
            }
            catch (UAException uaException)
            {
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
                return;
            }

            // Display results
            Console.WriteLine("Refreshed trust lists: {0}", refreshedTrustLists);
        }
    }
}
// Shows how to refresh own certificate stores using current trust lists
// for the application from the certificate manager.

class procedure RefreshTrustLists.Main;
var
  Client: _EasyUAClient;
  ClientApplication: _EasyUAClientApplication;
  GdsEndpointDescriptor: _UAEndpointDescriptor;
  RefreshedTrustLists: UATrustListMasks;
begin
  // Define which GDS we will work with.
  GdsEndpointDescriptor := CoUAEndpointDescriptor.Create;
  GdsEndpointDescriptor.UrlString := 'opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer';
  GdsEndpointDescriptor.UserIdentity.UserNameTokenInfo.UserName := 'appadmin';
  GdsEndpointDescriptor.UserIdentity.UserNameTokenInfo.Password := 'demo';

  // Obtain the client application service.
  Client := CoEasyUAClient.Create;
  ClientApplication := IInterface(Client.GetServiceByName('OpcLabs.EasyOpc.UA.Application.IEasyUAClientApplication, OpcLabs.EasyOpcUA')) as _EasyUAClientApplication;

  // Display which application we are about to work with.
  WriteLn('Application URI string: ', ClientApplication.GetApplicationElement.ApplicationUriString);

  // Refresh own certificate stores using current trust lists for the application from the certificate manager.
  try
    RefreshedTrustLists := clientApplication.RefreshTrustLists(gdsEndpointDescriptor);
  except
    on E: EOleException do
    begin
      WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message]));
      Exit;
    end;
  end;

  // Display results
  WriteLn('Refreshed trust lists: ', RefreshedTrustLists);
end;
// Shows how to refresh own certificate stores using current trust lists
// for the application from the certificate manager.

// Define which GDS we will work with.
$GdsEndpointDescriptor = new COM("OpcLabs.EasyOpc.UA.UAEndpointDescriptor");
$GdsEndpointDescriptor->UrlString = "opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer";
$GdsEndpointDescriptor->UserIdentity->UserNameTokenInfo->UserName = "appadmin";
$GdsEndpointDescriptor->UserIdentity->UserNameTokenInfo->Password = "demo";

// Obtain the client application service.
$Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient");
$ClientApplication = $Client->GetServiceByName("OpcLabs.EasyOpc.UA.Application.IEasyUAClientApplication, OpcLabs.EasyOpcUA");

// Display which application we are about to work with.
printf("Application URI string: %s\n", $ClientApplication->GetApplicationElement->ApplicationUriString);

// Refresh own certificate stores using current trust lists for the application from the certificate manager.
try
{
    $RefreshedTrustLists = $ClientApplication->RefreshTrustLists($GdsEndpointDescriptor);
}
catch (com_exception $e)
{
    printf("*** Failure: %s\n", $e->getMessage());
    exit();
}

// Display results
printf("Refreshed trust lists: %s\n", $RefreshedTrustLists);
Rem Shows how to refresh own certificate stores using current trust lists
Rem for the application from the certificate manager.

Private Sub IEasyUAClientApplication_RefreshTrustLists_Main_Command_Click()
    OutputText = ""
    
    ' Define which GDS we will work with.
    Dim gdsEndpointDescriptor As New UAEndpointDescriptor
    gdsEndpointDescriptor.UrlString = "opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer"
    gdsEndpointDescriptor.UserIdentity.UserNameTokenInfo.UserName = "appadmin"
    gdsEndpointDescriptor.UserIdentity.UserNameTokenInfo.Password = "demo"
    
    ' Obtain the client application service.
    Dim client As New EasyUAClient
    Dim clientApplication As AbstractEasyUAClientApplication
    Set clientApplication = client.GetServiceByName("OpcLabs.EasyOpc.UA.Application.IEasyUAClientApplication, OpcLabs.EasyOpcUA")
    
    ' Display which application we are about to work with.
    OutputText = OutputText & "Application URI string: " & clientApplication.GetApplicationElement.applicationUriString & vbCrLf

    ' Refresh own certificate stores using current trust lists for the application from the certificate manager.
    On Error Resume Next
    Dim refreshedTrustLists As UATrustListMasks
    refreshedTrustLists = clientApplication.RefreshTrustLists(gdsEndpointDescriptor)
    If Err.Number <> 0 Then
        OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf
        Exit Sub
    End If
    On Error GoTo 0

    ' Display results
    OutputText = OutputText & "Refreshed trust lists: " & refreshedTrustLists & vbCrLf
End Sub
' Shows how to refresh own certificate stores using current trust lists for the application from the certificate manager.

Imports Microsoft.Extensions.DependencyInjection
Imports OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.Application
Imports OpcLabs.EasyOpc.UA.Application.Extensions
Imports OpcLabs.EasyOpc.UA.Extensions
Imports OpcLabs.EasyOpc.UA.Gds
Imports OpcLabs.EasyOpc.UA.OperationModel

Namespace UADocExamples.Application._IEasyUAClientApplication
    Friend Class RefreshTrustLists
        Public Shared Sub Main1()

            ' Define which GDS we will work with.
            Dim gdsEndpointDescriptor As UAEndpointDescriptor =
                New UAEndpointDescriptor("opc.tcp://opcua.demo-this.com:58810/GlobalDiscoveryServer") _
                .WithUserNameIdentity("appadmin", "demo")

            ' Obtain the client application service.
            Dim client = New EasyUAClient()
            Dim clientApplication = client.GetService(Of IEasyUAClientApplication)()

            ' Display which application we are about to work with.
            Console.WriteLine("Application URI string: {0}",
                clientApplication.GetApplicationElement().ApplicationUriString)

            ' Refresh own certificate stores using current trust lists for the application from the certificate manager.
            Dim refreshedTrustLists As UATrustListMasks
            Try
                refreshedTrustLists = clientApplication.RefreshTrustLists(gdsEndpointDescriptor)
            Catch uaException As UAException
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException.Message)
                Exit Sub
            End Try

            ' Display results
            Console.WriteLine("Refreshed trust lists: {0}", refreshedTrustLists)
        End Sub
    End Class
End Namespace
Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012 R2, Windows Server 2016; .NET Core, .NET 6: Linux, macOS, Microsoft Windows

See Also