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pictureBox1.Visible = true; //显示进度条
tabControl1.SelectedTab = tabPage2; 切换到表格显示页
ThreadStart tr_star = new ThreadStart(dobutton1); //将处理程序(费时间的)放到单独的进程中
Thread myThread = new Thread(tr_star);
myThread.Name = "jhcx";
myThread.Start();//开始进程,进程会填充DataGridView.