namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private int _handle;
        private readonly DataTable _alarms = new DataTable("Alarms");
 
        public Form1()
        {
            InitializeComponent();
 
            _alarms.Columns.Add("Time");
            _alarms.Columns.Add("Condition");
            _alarms.Columns.Add("Source");
            _alarms.Columns.Add("Message");
 
            dataGridView1.DataSource = _alarms;
        }
 
        private void Form1_Shown(object sender, EventArgs e)
        {
            easyAEClient1.Notification += OnNotification;
            _handle = easyAEClient1.SubscribeEvents("", "OPC.SimotionAlarms", 100);
        }
 
        private void OnNotification(object sender, EasyAENotificationEventArgs args)
        {
            if (args.Exception != null || args.Event == null) return;
 
            if (args.Event.Active)
            {
                var row = _alarms.NewRow();
 
                row["Time"] = args.Event.Time;
                row["Condition"] = args.Event.ConditionName;
                row["Source"] = args.Event.QualifiedSourceName;
                row["Message"] = args.Event.Message;
 
                _alarms.Rows.Add(row);
            }
            else
            {
                var result = _alarms.Rows
                                    .Cast<DataRow>()
                                    .Where(row => row["Condition"].Equals(args.Event.ConditionName) && row["Source"].Equals(args.Event.QualifiedSourceName))
                                    .ToList();
 
                foreach (var row in result)
                {
                    _alarms.Rows.Remove(row);
                }
            }
        }
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            easyAEClient1.UnsubscribeAllEvents();
        }
 
        private void btnRefreshAlarms_Click(object sender, EventArgs e)
        {
            _alarms.Rows.Clear();
            easyAEClient1.RefreshEventSubscription(_handle);
        }
 
        private void btnExit_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}