public void test() { Thread.Sleep(1000); string vvv = ""; for (int i = 0; i < 100000;i++ ) { vvv = vvv +i.ToString() + "\r\n"; lblTip.Text = "已完成:[" + ((float)i*100 / (float)100000).ToString("0.00") + "%]...的数据"; Application.DoEvents(); } this.textBox1.Text = vvv; }