Visual C＃：Metro应用程序更改背景（以编程方式）

Question

C＃中是否有改变当前页面（或网格）背景的功能？

C＃：

int hourOfDay = DateTime.Now.Hour;
if(hourOfDay <= 12 && hourOfDay >= 18) {
    /* Set background to afternoon_bg.jpg
     * 
     * In XAML:
     * <Grid.Background>
     *     <ImageBrush ImageSource="/Assets/afternoon_bg.jpg" Stretch="UniformToFill" />
     * </Grid.Background> */
}
if(hourOfDay <= 6 && hourOfDay >= 12) {
    /* Set background to morning_bg.jpg
     * 
     * In XAML:
     * <Grid.Background>
     *     <ImageBrush ImageSource="/Assets/morning_bg.jpg" Stretch="UniformToFill" />
     * </Grid.Background> */
}

Answer 1

试试这段代码：

ImageBrush ib = new ImageBrush();
ib.ImageSource = new BitmapImage( new Uri(@"\Pictures\profile.jpg", UriKind.Relative));
grd.Background = ib;

grd是您的网格名称。

Answer 2

LayoutRoot是您的网格名称，您可以设置这样的背景：

    int hourOfDay = DateTime.Now.Hour;
    ImageBrush ib = new ImageBrush();
    if(hourOfDay >= 12 && hourOfDay < 18) {
        ib.ImageSource = new BitmapImage( new Uri("ms-appx:///Assets/afternoon_bg.jpg", UriKind.Relative));
    }
    else if (hourOfDay >= 6 && hourOfDay < 12)
    {
        ib.ImageSource = new BitmapImage(new Uri("ms-appx:///Assets/morning_bg.jpg", UriKind.Relative));
    }
    else
    {
        // do something
    }
    LayoutRoot.Background = ib;