c# winform 置于顶层的功能用后台代码来实现，BringToFront()

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private void pictureBox1_Click(object sender, EventArgs e)  {   //MessageBox.Show((sender as PictureBox).Size.Height.ToString());   //MessageBox.Show((sender as PictureBox).Size.Width.ToString());   (sender as PictureBox).Height = 230;   (sender as PictureBox).Width = 230;   (sender as PictureBox).BringToFront();   MessageBox.Show((sender as PictureBox).Name);  } 
   (sender as PictureBox).BringToFront();  可以把当前选中的控件置于顶层
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