/// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void ClientOnMonitoredItemChanged(object sender, EasyUAMonitoredItemChangedEventArgs eventArgs) { // We have passed in a reference to the target TextBox as the State property in EasyUAMonitoredItemArguments. var textBox = (TextBox) eventArgs.Arguments.State; if (eventArgs.Succeeded) textBox.Text = eventArgs.AttributeData.DisplayValue(); else textBox.Text = "*** Error"; } private void Window_Loaded(object sender, RoutedEventArgs e) { // Define the target controls, the OPC data we want to monitor, and how fast. var arguments = new [] { new EasyUAMonitoredItemArguments(TextBox1, "http://localhost:51211/UA/SampleServer", "nsu=http://test.org/UA/Data/;i=10845", 1000), new EasyUAMonitoredItemArguments(TextBox2, "http://localhost:51211/UA/SampleServer", "nsu=http://test.org/UA/Data/;i=10853", 1000), new EasyUAMonitoredItemArguments(TextBox3, "http://localhost:51211/UA/SampleServer", "nsu=http://test.org/UA/Data/;i=10855", 1000) }; // Hook the event handler, and subscribe to OPC data _client.MonitoredItemChanged += ClientOnMonitoredItemChanged; _handles = _client.SubscribeMultipleMonitoredItems(arguments); } private void Window_Unloaded(object sender, RoutedEventArgs e) { // Unsubscribe from OPC data, and unhook the event handler _client.UnsubscribeMultipleMonitoredItems(_handles); _client.MonitoredItemChanged -= ClientOnMonitoredItemChanged; } private readonly EasyUAClient _client = new EasyUAClient(); private int[] _handles; }