线程间操作无效: 从不是创建控件“pbarc”的线程访问它 解决办法

 public partial class Form5 : Form    {        public Thread PBarThread;        private delegate void MyTestDelegate(object obj);        private MyTestDelegate myTest;        /// <summary>        /// dev进度条        /// </summary>        private DevExpress.XtraEditors.ProgressBarControl pBarc;        public Form5()        {            InitializeComponent();        }        private void Form5_Load(object sender, EventArgs e)        {            pBarc.Properties.Minimum = 0;//设置进度条最小值            pBarc.Properties.Maximum = 10;//设置进度条最大值            pBarc.Properties.Step = 1;//设置进度条步长            pBarc.Properties.ProgressViewStyle = DevExpress.XtraEditors.Controls.ProgressViewStyle.Broken;//设置进度条样式            pBarc.Position = 0;//设置进度条开始位置        }        private void button1_Click(object sender, EventArgs e)        {            PBarThread = new Thread(new ParameterizedThreadStart(fun));            PBarThread.Start();        }        /// <summary>        /// 线程执行的事件 在子线程中为代理赋值，并执行代理 防止线程跨界访问错误        /// </summary>        /// <param name="obj"></param>        private void fun(object obj)        {            if (this.InvokeRequired)            {                myTest += fun;                this.BeginInvoke(myTest, new object[] { obj });            }            else            {                pBarc.PerformStep();//走进度条            }        }    }