一、问题来源
跨线程操作时会报错：System.InvalidOperationException:“线程间操作无效: 从不是创建控件的线程访问它。

二、问题代码
 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
//using MSExcel = Microsoft.Office.Interop.Excel;
using System.Reflection;
using System.IO;

namespace WindowsFormsApp1
{
   
    
    public partial class Form1 : Form
    {

        List<string> savedData;
        public string stra = null;
        public string strs = null;
        public string stra1 = null;
        public string stra2 = null;
        String[] recevedData;
        string path;
        public string filename;
        Thread th;
        Thread thWriteExcel;
        Socket socketSend;
        bool isCollecting = false;
        string datadirection = null;
        int numData; //收到的数据个数；


        public Form1()
        {
            InitializeComponent();
            numData = 0;
            savedData = new List<string>();
        }
       
        private void label6_Click(object sender, EventArgs e)
        {
            Form3 form = new Form3();
            form.ShowDialog();

        }



        //采集
        private void label5_Click(object sender, EventArgs e)
        {
            
            try
            {
                socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);  //初始化
                IPAddress ip = IPAddress.Parse("192.168.199.1");
                IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(8080));
                socketSend.Connect(point);
                MessageBox.Show("连接成功！");
                th = new Thread(ReceiveData);
                th.IsBackground = true;
                th.Start();
                isCollecting = true;
            }
            catch (SocketException ex)
            {
                 return;
            }

            label5.Text = "采集中";
            this.label5.Image = global::WindowsFormsApp1.Properties.Resources.anniu_jh;
        }
        //接收数据
        public void ReceiveData()
        {
            while (isCollecting)
            {

                try
                {
                    byte[] receiveMessage = new byte[1024 * 1024 * 2];
                    //接收的字节数
                    int receiveNumber = 0;

                    receiveNumber = socketSend.Receive(receiveMessage);
                    // MessageBox.Show(receiveNumber.ToString());

                    if (receiveNumber == 0)
                    {
                        break;
                    }
                    //字节转换成字符串
                    string str = Encoding.UTF8.GetString(receiveMessage, 0, receiveNumber);
                    //打印到窗体
                    recevedData = str.Split(',');
                    printMessage();
                    strs = SubData(0) + ":\r\n";
                    stra = null;
                    stra1 = null;
                    stra2 = null;
                    numData++;
                }
                catch (SocketException e)
                {
                    MessageBox.Show(e.ToString());

                }
            }

        }
   
        //数据输出
        public string SubData(int p)
        {
            return recevedData[p];
        }
        private void printMessage()
        {
            label7.Text = SubData(1);

        }

        private void label4_Click(object sender, EventArgs e)
        {
            if (isCollecting)
            {
                th.Abort();
                isCollecting = false;
                socketSend.Shutdown(SocketShutdown.Both);
                socketSend.Close();
                MessageBox.Show("停止采集");
                label4.Text = "开始采集";
                this.label4.Image = global::WindowsFormsApp1.Properties.Resources.anniu;


            }
        }
    }
}

三、问题截图

四、解决方案

加入 Control.CheckForIllegalCrossThreadCalls = false; //加载时 取消跨线程检查
public Form1()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false; //加载时 取消跨线程检查
            numData = 0;
            savedData = new List<string>();
        }