问使用Windows窗体处理通知

EN

//this is the notification control to process the change value event.
    public  void OnNotification(MonitoredItem monitoredItem, MonitoredItemNotificationEventArgs e,
        MonitorHandler mh)
    {
        //check which thread called OnNotification 

        if (this.InvokeRequired)
        {
            this.BeginInvoke((Action)delegate () { OnNotification(monitoredItem, e, mh); });
               
        }
        else
        {
            mh.monitoredItem = monitoredItem;
            foreach (var value in monitoredItem.DequeueValues())
            {
                mh.SetValue(value);
                mh.SetQuality(value);
                mh.SetTimeStamp(value);

                if (loggingOn)
                {
                    //add to log
                   log.AddRecord(monitoredItem, value);
                }
            }
        }

    }

public void OnNotification(MonitoredItem monitoredItem, MonitoredItemNotificationEventArgs e)
    {
        foreach (var value in monitoredItem.DequeueValues())
        {
            if (loggingOn)
            {
                //add to log
                log.AddRecord(monitoredItem, value);
            }
        }

    }

public void AddRecord(MonitoredItem item, DataValue value)
    {
        var str = item.DisplayName.Replace("\"", "");
        //find the right element
        var searchStr = "log/Tag[@Name='" + str + "']";
        var tagNode = xmlDoc.SelectSingleNode(searchStr);
        if (tagNode !=null)
        {
           var dpAdd = dpNode.CloneNode(true);
            //time node
           dpAdd.FirstChild.InnerText = value.ServerTimestamp.ToString("hh:mm:ss.fff");
            //value node
           dpAdd.LastChild.InnerText = value.WrappedValue.ToString();

           tagNode.AppendChild(dpAdd);
        }
     }