new一个线程来改变UI上的控件值，

代码如下，但是有不少错误，先是这句：

if (form1.labelHour.InvokeRequired)

在labelHour下有红线，我把这个label在designer处把private改成public还是报错，还有问题就是不能修改这个label值，这是什么原因？

```c#
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace atinyTest_New
{
    public delegate void MyInvoke(string str);
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            

        }

        private void button_Start_Click(object sender, EventArgs e)
        {
            Test test1 = new Test();
            Thread thread = new Thread(new ThreadStart(test1.fun));
            thread.Start();
        }
    }

    public class Test
    {
        bool enableTest = false;
        private string myIp;
        private byte myFrameCnt = 0;
        const int frameSize = 1280;
        float[,] frameData = new float[frameSize, 3];

        private int TotalFrameCount = 0;        //总连接次数
        private int FailedFrameCount = 0;       //失败连接次数
        private double Avg = 0;                 //偏差均值
        private double stdDeviation;            //数据偏差均方差
        private int DataExceptionCount = 0;     //数据异常次数
        TimeSpan totalSpan;
        TimeSpan currentSpan;
        Form form1;
        public Test() 
        {
            form1 = new Form1();
        }

        public void fun()
        {
            //_myInvoke("dddd");
            SetText("ddd");
        }
        private void SetText(string s)
        {
            if (form1.labelHour.InvokeRequired)
            {
                MyInvoke _myInvoke = new MyInvoke(SetText);
                form1.Invoke(_myInvoke, new object[] { s });
            }
            else
            {
                form1.labelHour.Text = s;
            }
        }
    }
  
}

```