假设 点击按钮启动一个线程

Thread t1 = new Thread(() => RunAddFile(tb_file.Text.Trim()));                //创建一个线程

现在在线程中修改主线程创建的控件tb_log的文本

#region 自定义方法RunAddFile主要是通过线程序来实现对文件夹下所有子文件夹和文件的遍历                /// 
        /// path 是路径        /// 
        ///         public void RunAddFile(string path)        {                        DirectoryInfo dir = new DirectoryInfo(path);                    DirectoryInfo dirD = dir as DirectoryInfo;                    FileSystemInfo[] files = dirD.GetFileSystemInfos();            foreach (FileSystemInfo i in files)                                    //对单个FileSystemInfo进行判断,如果是文件夹则进行递归操作            {                //如果是文件夹                //System.Windows.Forms.MessageBox.Show(i.Name+" "+i.FullName);                FileInfo file = i as FileInfo;                if (file != null)                {                    AddOkPath(file.DirectoryName + "\\" + file.Name);                }                else                {                    string newpath = "";                    newpath = i.FullName;                    RunAddFile(newpath);                }            }        }                        /// 
        /// 修改 日志        /// 
        ///         private void AddOkPath(string path) {            if (this.tb_log.InvokeRequired)            {                                        Action
    
      actionDelegate = delegate(string txt)                {                    StringBuilder sb = new StringBuilder();                    sb.Append(tb_log.Text + System.Environment.NewLine);                    sb.Append("目录：" + txt + System.Environment.NewLine);                    tb_log.Text = sb.ToString();                    //RunAddFile(txt);  //这句导致 报 未将引用对象设置到实例                    li_img.Add(path);                };                this.tb_log.Invoke(actionDelegate, path);                            }        }