c#RFID读卡器，中距离一体机，

Question

问题遇到的现象和发生背景 读不出数据

问题相关代码，请勿粘贴截图 using NLE.Device.UHF;

using NLE.Device.UHF;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Threading;
namespace WpfApplication1
{

public partial class UHFWindow : Window
{
    private UHFReader rfidDevice = new UHFReader("COM7");
  
    private DispatcherTimer dispatcherTimer;
    public UHFWindow()
    {
        InitializeComponent();
        dispatcherTimer = new DispatcherTimer();
        dispatcherTimer.Tick += DispatcherTimer_Tick;
        dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
    }

    private void DispatcherTimer_Tick(object sender, EventArgs e)
    {
        ThreadPool.QueueUserWorkItem(o =>
        {
            if (rfidDevice != null)
            {
                string[] rfids = rfidDevice.ReadEpcSection();
                if (rfids.Length > 0)
                {
                    if (Application.Current.Dispatcher.Thread != System.Threading.Thread.CurrentThread)
                    {
                        Application.Current.Dispatcher.Invoke(new Action(() =>
                        {
                            foreach (var item in rfids)
                                txtUHF.Text += item + "\r\n";
                        }));
                    }

                }

            }
        });
    }

    private void btnUHF_Click(object sender, RoutedEventArgs e)
    {
        dispatcherTimer.Start();

        //if (rfidDevice != null)
        //{
        //    string[] rfids = rfidDevice.ReadEpcSection();
        //    if (rfids.Length > 0)
        //    {

        //        foreach (var item in rfids)
        //            txtUHF.Text += item + "\r\n";
        //    }

        //}
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
      

        if (!rfidDevice.Connect())
        {
            MessageBox.Show("未能打开中距离串口");
        }
    }
}

}

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果看看有什么错误吗

Answer 1

DispatcherTimer触发的内容会直接转到主线程去执行（耗时操作会卡住主线程），换System.Timers.Timer试试