延时问题

Question

                        label1.Visible = false;
                        //label1.Refresh();                        label2.Visible = false;
                        //label2.Refresh();                        textBox1.Visible = false;
                        //textBox1.Refresh();                        textBox2.Visible = false;
                        //textBox2.Refresh();                        btn_Login.Visible = false;
                        //btn_Login.Refresh();                        btn_Cancel.Visible = false;
                        //btn_Cancel.Refresh();                        label9.Visible = true;
                        label9.Refresh();
                        //这个地方
                        System.Threading.Thread.Sleep(2000);                        label9.Visible = false;
                        label9.Refresh();这段代码没有能在"这个地方"隐藏掉该隐藏的控件,请教,这是怎么回事?

Answer 1

label9.text = "登录成功";
只显示2秒钟然后消失
在显示label9的时候,该隐藏的登录控件依旧可见,在label9消失的时候才不可见的,不知道说明白了没有.

Answer 2

label1.Visible = false;
                        label1.Refresh();                        label2.Visible = false;
                        label2.Refresh();                        textBox1.Visible = false;
                        textBox1.Refresh();                        textBox2.Visible = false;
                        textBox2.Refresh();                        btn_Login.Visible = false;
                        btn_Login.Refresh();                        btn_Cancel.Visible = false;
                        btn_Cancel.Refresh();                        label9.Visible = true;
                        label9.Refresh();                        System.Threading.Thread.Sleep(2000);                        label9.Visible = false;
                        label9.Refresh();这样也依旧.

Answer 3

Sleep(2000)的时候，UI没有刷新；
sleep之前先强制刷新一下；

Answer 4

label9.parent.refresh();System.Threading.Thread.Sleep(2000);