Question

我一直在尝试创建一个通知窗口, 但我正在努力弄清楚为什么在我运行时不发生这种不透明的变化。相反, 窗口会停留一秒钟, 然后关闭而没有任何明显的变化。我通过其他方法所做的其他尝试都失败了, 所以这一定是我缺少的一些属性。感谢您的帮助!

    public void RunForm(string error, MessageBoxIcon icon, int duration)
    {
        lblMessage.Text = error;
        Icon i = ToSystemIcon(icon);
        if (i != null)
        {
            BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(i.Handle, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
            imgIcon.Source = bs;
        }
        this.WindowStartupLocation = WindowStartupLocation.Manual;
        this.Show();
        this.Left = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Right - this.RestoreBounds.Width - 20;
        this.Top = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Bottom - this.RestoreBounds.Height - 20;
        while (this.Opacity > 0)
        {
            this.Opacity -= 0.05;
            Thread.Sleep(50);
        }
        this.Close();
    }


<Window Width="225" Height="140" VerticalContentAlignment="Center" HorizontalAlignment="Center" ShowActivated="True" ShowInTaskbar="False"
ResizeMode="NoResize" Grid.IsSharedSizeScope="False" SizeToContent="Height" WindowStyle="None" BorderBrush="Gray" 
BorderThickness="1.5" Background="White" Topmost="True" AllowsTransparency="True" Opacity="1">
<Grid Height="Auto" Name="grdNotificationBox" >
    <Image Margin="12,12,0,0" Name="imgIcon" Stretch="Fill" HorizontalAlignment="Left" Width="32" Height="29" VerticalAlignment="Top" />
    <TextBlock Name="lblMessage" TextWrapping="Wrap" Margin="57,11,17,11"></TextBlock>
</Grid>

Answer 1

This can t work: The complete WPF handling is done in one single thread (technically two but not important). you change the opacity and directly let the ui thread sleep, change it again and send it back to sleep. The ui thread never got any time to process what you did. Even removing the sleep would not help, because than it would be much to fast, and the ui thread could not handle any requests aswell. Its important to understand that your code and WPFs handling is done in the same thread, the longer you need, the less time WPF got and vice versa.

要解决这个问题, 您需要使用 < a href=" "http:// msdn. microsoft. com/ en- us/library/ ms752312.aspx" rel = "nofollow noreferr" > animerations 。它们正是用于这类事情的。查看此 < a href= > https:// stackoverflow.com/ questionss/59558508/fading-out- a- window" >thread 。

Answer 2

您基本上屏蔽了在您的 < code> 循环 < / code> 中更新的 UI 线索。使用计时器或使用 < a href=" http:// msdn. microsoft. com/ en- us/library/ cc221403% 28v=vs. 95%29. aspx" rel = "nofollow" > Backroundworker Thread 更合适。

编辑 : 以 < strong > do while for 表示, 您可以为此使用 WPF 动画。 < a href="http:// tarundotnet.wordpress.com/2011/03/18/wpf-tuative- change- oopacity- useing- animation/" rel= "nofollow" > 此文章详细讨论此内容。

DoubleAnimation da = new DoubleAnimation();
da.From = 1;
da.To = 0;
da.Duration = new Duration(TimeSpan.FromSeconds(2));
da.AutoReverse = true;
da.RepeatBehavior = RepeatBehavior.Forever;
rectangle1.BeginAnimation(OpacityProperty, da);

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