Question

C# winform this.Visible = false后出现一个短暂的白屏

大家看看下面的代码，为什么点击form上的pictruebox执行一个函数以后，form所在的整个区域偶尔出现一个白屏，时间很短，但是很难看的，代码如下
private void pictureBox2_Click(object sender, EventArgs e)
{
this.Visible = false;
this.pictureBox1.Visible = false;
this.pictureBox2.Visible = false;
this.form2.hangupcall();

Thread.Sleep(1000);
Application.DoEvents();
this.Visible = true;
this.pictureBox1.Visible = true;
this.pictureBox2.Visible = false;
}

Answer 1

你写了Thread.Sleep(1000);这一句，这个是让线程暂停1秒啊，你要不就另外写一个线程来执行，要不你就不要这一句试试

Answer 2

this.Visible = false;
this.pictureBox1.Visible = false;
this.pictureBox2.Visible = false;
这3句代码没必要写, 你可以在这三个控件的属性里面直接把visible设置成false；

Answer 3

this.Visible = false;
this.pictureBox1.Visible = false;
this.pictureBox2.Visible = false;
this.form2.hangupcall();
Application.DoEvents();
Thread.Sleep(1000);

this.Visible = true;
this.pictureBox1.Visible = true;
this.pictureBox2.Visible = false;