奇怪的Windows.Opacity行为

Question

我有一个按钮事件，它导致平滑不透明和窗口最小化。

private void Button_WindowMinimize(object sender, EventArgs e)
{
    DoubleAnimation WindowOpacity = new DoubleAnimation()
    {
        From = Opacity,
        To = 0,
        Duration = TimeSpan.FromMilliseconds(300)
    };

    WindowOpacity.Completed += (se, ex) => { Opacity = 1; WindowState = WindowState.Minimized; };
    BeginAnimation(Window.OpacityProperty, WindowOpacity);
}

当窗口最小化时，我会产生一个不透明的Opacity = 1; (这样我就可以在鼠标悬停时看到任务栏上的屏幕截图)。

为什么赋值失败了？Opacity = 1;？生成的不透明度设置为零。为什么这不起作用？谢谢

Answer 1

默认情况下，动画在完成后会保留最终值。如果要在完成后重置该值，则应将FillBehavior设置为Stop

DoubleAnimation WindowOpacity = new DoubleAnimation()
        {
            From = Opacity,
            To = 0,
            Duration = TimeSpan.FromMilliseconds(300),
            FillBehavior = FillBehavior.Stop
        };

        WindowOpacity.Completed += (se, ex) => { WindowState = WindowState.Minimized; };
        BeginAnimation(Window.OpacityProperty, WindowOpacity);