C#Backgroundworker和Twincat,如何在工作线程中触发通知事件

Question

我对混合事件和线程知之甚少.场景是在PC上运行C#程序,在PLC上运行Twincat.我们需要在C#程序中访问PLC变量(已经完成了没有后台工作线程并且工作正常.)现在我们需要将这些处理移动到一个线程(最好是后台工作者).这是不起作用的代码.(表单包含一个START按钮,它将启动BGworker,一个STOP按钮将取消BGWorker,以及一个UPDATE按钮,它将值从PLC更新到文本框.),但现在tcClient_OnNotification没有被召唤!请指出我错过的地方,任何帮助将非常感谢.

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;


    using System.Threading;         // not added by default
    using System.IO;                // not added by default
    using TwinCAT.Ads;              // not added by default

    namespace BGworker
    {
        public partial class Form1 : Form
        {
            private BackgroundWorker bw = new BackgroundWorker();
            private TcAdsClient tcClient;   // C# program is the client.
            private AdsStream dataStream;   // Data transfered through System IOStream
            private BinaryReader binReader; // We are now reading value from PLC
            private int Hintval;            // Handle for integer value

            public static bool looping = true;
            public static string receivedtext = "";

            public Form1()
            {
                InitializeComponent();

                bw.WorkerReportsProgress = true;
                bw.WorkerSupportsCancellation = true;
                bw.DoWork += new DoWorkEventHandler(bw_DoWork);
                bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
                bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
            }

            private void Form1_Load(object sender, EventArgs e)
            {

            }


            private void Startbutton_Click(object sender, EventArgs e)
            {
                if (bw.IsBusy != true)
                {
                    bw.RunWorkerAsync();
                }

            }




            private void Stopbutton_Click(object sender, EventArgs e)
            {
                if (bw.WorkerSupportsCancellation == true)
                {
                    bw.CancelAsync();
                }
            }


            public void bw_DoWork(object sender, DoWorkEventArgs e)
            {
                BackgroundWorker worker = sender as BackgroundWorker;
                dataStream = new AdsStream(1 * 2); // Single value will be read
                binReader = new BinaryReader(dataStream, Encoding.ASCII);
                tcClient = new TcAdsClient();
                tcClient.Connect(801);
                //Hintval = tcClient.CreateVariableHandle(".GOUTINT");
                Hintval = tcClient.AddDeviceNotification(".GOUTINT", dataStream, 0, 2, AdsTransMode.OnChange, 100, 0, null);
                tcClient.AdsNotification += new AdsNotificationEventHandler(tcClient_OnNotification);

                while (true)
                {
                    if ((worker.CancellationPending == true))
                    {
                        e.Cancel = true;
                        break;
                    }
                    else
                    {
                        System.Threading.Thread.Sleep(100);
                        //worker.ReportProgress((5* 10));

                    }
                }

                tcClient.Dispose();
            }


            public void tcClient_OnNotification(object sender, AdsNotificationEventArgs e)
            {
                try
                {
                    // Setting the position of e.DataStream to the position of the current required value
                    e.DataStream.Position = e.Offset;

                    // Determining which variable has changed
                    if (e.NotificationHandle == Hintval)
                    {
                        receivedtext = binReader.ReadInt16().ToString();
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }

            private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
            {
                if ((e.Cancelled == true))
                {
                    this.tbProgress.Text = "Canceled!";
                }

                else if (!(e.Error == null))
                {
                    this.tbProgress.Text = ("Error: " + e.Error.Message);
                }

                else
                {
                    this.tbProgress.Text = "Done!";
                }
            }
            private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
            {
                this.tbProgress.Text = (e.ProgressPercentage.ToString() + "%");
            }

            private void buttonUpdate_Click(object sender, EventArgs e)
            {
                this.tbProgress.Text = receivedtext;
            }

        }
    }

提前致谢.Abhilash.

Answer 1

校验 TcAdsClient.Synchronize

TwinCAT ADS.NET帮助说:

如果Synchronize设置为true,则通知将同步到主线程.这对于Windows窗体项目是必需的.在控制台应用程序中,此属性应设置为false.

Answer 2

你一定要检查以下是否适合你:

myTcAdsClient.Synchronize = false 

在初始化TcAdsClient实例后立即执行此操作.将Synchronize设置为true在基于GUI的应用程序中最有意义,这些应用程序严重依赖主线程.

在我当前的项目中,我创建了一个围绕TcAdsClient的包装类,以便能够在启动和停止TwinCat环境的Windows服务中使用它,但是包装器设备类在单独的线程上托管AdsClient(在无限的Run()循环中).

对于TwinCat变量方面的更改通知,我的包装器类提供了一个自己的事件,Windows服务连接到该事件; 只要底层TwinCat客户端的AdsNotificationExEventHandler在设备包装器类中被触发,就会触发它.当我在WindowsForms应用程序中测试此设置时,一切正常.但不是在控制台应用程序中,也不在我的Windows服务中 - AdsNotificationExEventHandler从未触发过.关键是TcAdsClient的线程同步功能 - 默认设置是尝试将所有通知同步到主线程,这不是我的设置的正确选择.对你来说似乎也是如此.