OPC Studio User's Guide and Reference
NodeElements Property (AEAreaOrSourceDialog)
Example 



OpcLabs.EasyOpcForms Assembly > OpcLabs.EasyOpc.AlarmsAndEvents.Forms.Browsing Namespace > AEAreaOrSourceDialog Class : NodeElements Property
Contains information gathered about OPC nodes (areas or sources in OPC event server's area space).
Syntax
'Declaration
 
<JetBrains.Annotations.ItemNotNullAttribute()>
<JetBrains.Annotations.NotNullAttribute()>
Public ReadOnly Property NodeElements As AENodeElement()
'Usage
 
Dim instance As AEAreaOrSourceDialog
Dim value() As AENodeElement
 
instance.NodeElements = value
 
value = instance.NodeElements
[JetBrains.Annotations.ItemNotNull()]
[JetBrains.Annotations.NotNull()]
public AENodeElement[] NodeElements {get;}
[JetBrains.Annotations.ItemNotNull()]
[JetBrains.Annotations.NotNull()]
public:
property array<AENodeElement^>^ NodeElements {
   array<AENodeElement^>^ get();
}

Property Value

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

The individual elements of the property value cannot be null (Nothing in Visual Basic).

Example
// This example shows how to let the user browse for OPC Alarms&Events areas or sources. 
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-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.Linq;
using System.Windows.Forms;
using OpcLabs.EasyOpc.AlarmsAndEvents.Forms.Browsing;

namespace FormsDocExamples._AEAreaOrSourceDialog
{
    static class ShowDialog
    {
        public static void Main1(IWin32Window owner)
        {
            var areaOrSourceDialog = new AEAreaOrSourceDialog
            {
                ServerDescriptor = {ServerClass = "OPCLabs.KitEventServer.2"}
            };

            DialogResult dialogResult = areaOrSourceDialog.ShowDialog(owner);
            if (dialogResult != DialogResult.OK)
                return;

            // Display results
            string nodeElementsString = string.Join("\n", areaOrSourceDialog.NodeElements.Select(element => element));
            MessageBox.Show(owner, nodeElementsString);
        }
    }
}
' This example shows how to let the user browse for OPC Alarms&Events areas or sources. 
'
' 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 OpcLabs.EasyOpc
Imports OpcLabs.EasyOpc.AlarmsAndEvents.AddressSpace
Imports OpcLabs.EasyOpc.AlarmsAndEvents.Forms.Browsing

Namespace FormsDocExamples._AEAreaOrSourceDialog
    Friend Class ShowDialog
        Shared Sub Main1(owner As IWin32Window)
            Dim areaOrSourceDialog = New AEAreaOrSourceDialog() With {
                .ServerDescriptor = New ServerDescriptor() With {
                    .ServerClass = "OPCLabs.KitEventServer.2"
                }
            }

            Dim dialogResult As DialogResult = areaOrSourceDialog.ShowDialog(owner)
            If dialogResult <> DialogResult.OK Then
                Return
            End If

            ' Display results
            Dim nodeElementsString As String = String.Join("\n", areaOrSourceDialog.NodeElements.Select(Function(element As AENodeElement) element))
            MessageBox.Show(owner, nodeElementsString)
        End Sub
    End Class
End Namespace
# This example shows how to let the user browse for OPC Alarms&Events areas or sources.
#
# Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
# OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-Python .
# 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.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from System.Windows.Forms import *
from OpcLabs.EasyOpc.AlarmsAndEvents.Forms.Browsing import *


areaOrSourceDialog = AEAreaOrSourceDialog()
areaOrSourceDialog.ServerDescriptor.ServerClass = "OPCLabs.KitEventServer.2"

dialogResult = areaOrSourceDialog.ShowDialog()
print(dialogResult)
if dialogResult != DialogResult.OK:
    exit()

# Display results.
print()
for nodeElement in areaOrSourceDialog.NodeElements:
    print(nodeElement)
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