代码
/// summary>
/// 鼠标移入处理方法
/// /summary>
/// param name="sender">/param>
/// param name="e">/param>
private void Window_MouseEnter(object sender, MouseEventArgs e)
{
    Brush brush = new SolidColorBrush(Color.FromArgb(0x78,0xFF,0xFF,0xFF));  // 创建一个纯色brush
    grid.Background = brush;  // 应用于grid
}
/// summary>
/// 鼠标移出处理方法
/// /summary>
/// param name="sender">/param>
/// param name="e">/param>
private void Window_MouseLeave(object sender, MouseEventArgs e)
{
    Brush brush = new SolidColorBrush(Color.FromArgb(0x52, 0xFF, 0xFF, 0xFF));  // 创建一个纯色brush
    grid.Background = brush;  // 应用于grid
}
/// summary>
/// 鼠标按下处理方法
/// /summary>
/// param name="sender">/param>
/// param name="e">/param>
private void Window_MouseDown(object sender, MouseButtonEventArgs e)
{
    mainWindow.Close();  // 或者使用mainWindow.Hide()隐藏窗口
}