Form.Hide 不会阻止表单包含在屏幕转储中

Question

问题

我正在使用以下代码执行屏幕转储。即使我用 this.Hide 隐藏了表单本身，该表单仍包含在屏幕转储中，我不希望它成为这样。

this.Hide(); //Hide to not include this form in the screen dump

try
{
    Rectangle bounds = Screen.GetBounds(Point.Empty);

    using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))
    {
        using (Graphics g = Graphics.FromImage(bitmap))
        {
            g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
        }

        bitmap.Save(fileName, ImageFormat.Png);
    }
}
catch (Exception exc)
{
    MessageBox.Show(LanguageMessages.MsgTextErrorScreenDump + 
        Utilities.DoubleNewLine() + exc.ToString(), 
        LanguageMessages.MsgCaptionErrorScreenDump, 
        MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
    this.Show(this.Owner);
}

我试过的： 隐藏表格后添加以下内容，没有任何区别：

睡觉（1000）；
this.Repaint();
this.Invalidate();

我的问题是： 为什么 this.Hide 没有真正隐藏表单，从而防止它被包含在上面代码的屏幕转储中？

Answer 1

您可以使用计时器作弊，这会给您足够的 "time" 来隐藏表格：

private System.Windows.Forms.Timer hideTimer = null;

整整一秒似乎就够了：

this.Hide();
hideTimer = new System.Windows.Forms.Timer() { Interval = 1000 };
hideTimer.Tick += (ts, te) => {
  hideTimer.Stop();
  hideTimer.Dispose();
  Rectangle bounds = Screen.GetBounds(this);
  using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height)) {
    using (Graphics g = Graphics.FromImage(bitmap)) {
      g.CopyFromScreen(bounds.Location, Point.Empty, bounds.Size);
    }
    bitmap.Save(fileName, ImageFormat.Png);
  }
  this.Show(this.Owner);
};
hideTimer.Start();

Form.Hide 不会阻止表单包含在屏幕转储中

Form.Hide does not prevent form from being included in screen dump

c#

screenshot

winforms