C#，需要从微控制器接收数据

Question

尝试从 mk 接收数据，使用 DataReceived 和处理程序事件，我所做的是 -按下程序上的按钮（代码如下），然后 mk 上的 LED 将打开，然后数据应发送回程序（期望 1，在字节值上，但也尝试了字符串值，不起作用）。发送方正在工作，但正在接收....不似乎我错过了什么。任何帮助都赞赏它。谢谢在进一步

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
namespace WindowsFormsApplication11
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }
        private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e) // As i understood, here we configure where i data will be shown,
                                                                                       // trying to get it on TextBox1
        {
            SerialPort sp = (SerialPort)sender;
            richTextBox1.Text += sp.ReadExisting() + "n";
        }
        private void button1_Click(object sender, EventArgs e)                                      // There are a main actions, first i receive data then send data by a click.    
        {
            serialPort1.Write("u0001");
            serialPort1.Close();
            System.ComponentModel.IContainer components = new System.ComponentModel.Container();  //  
            serialPort1 = new System.IO.Ports.SerialPort(components);
            serialPort1.PortName = "COM4";
            serialPort1.BaudRate = 9600;
            serialPort1.DtrEnable = true;
            serialPort1.Open();
            serialPort1.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

        }
    }
}

Answer 1

串行端口与 UI 位于不同的线程上。因此，当您收到一个字符时，由于您尚未调用 UI，因此会出现异常，并且 UI 不会更新。首先在DataReceivedHandler中调用 UI。你可以做这样的事情：

public static class ControlExt
{
    public static void InvokeChecked(this Control control, Action method)
    {
        try
        {
            if (control.InvokeRequired)
            {
                control.Invoke(method);
            }
            else
            {
                method();
            }
        }
        catch { }
    }
}

public partial class Form1 : Form
{
    private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
    {
        this.InvokeChecked(delegate
        {
            richTextBox1.Text += serialPort1.ReadExisting() + "n";
            richTextBox1.SelectionStart = Text.Length;
            richTextBox1.ScrollToCaret();
        });
    }
}