Question

My goal is to set a background picture for each page.
Consider this structure…

/Images/AppBackground.jpg
/App.xaml
/MainPage.xaml
/Page2.xaml

My first try was setting it on the rootframe as suggested elsewhere on this site… 😉

App.xaml.cs

ImageBrush brush = new ImageBrush
{
    ImageSource = new System.Windows.Media.Imaging.BitmapImage(new Uri("/Images/AppBackground.jpg", UriKind.Relative)),
    Opacity = 0.5d
};
this.RootFrame.Background = brush;

This will give me an error:
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

I tried with and without the starting /, tried UriKind.Absolute, And without a UriType parameter, all will give me the same error. The Image AppBackground.jpg has Build Action Content.

Below code will work just fine.

MainPage.xaml

<Grid x:Name="LayoutRoot">
    <Grid.Background>
        <ImageBrush ImageSource="/Images/AppBackground.jpg"></ImageBrush>
    </Grid.Background>
    ...

But that’s not what I want, I don’t want to set it for each page…

Anyone any idea what I’m screwing up? 😉

Answer 1

Crap. Wrong place; I was to early. In the constructor, it will simple overwrite the Background setting…

If I execute it at a later point, it’ll work just fine… 🙂

// Code to execute when the application is launching (eg, from Start)
// This code will not execute when the application is reactivated
private void Application_Launching(object sender, LaunchingEventArgs e)
{
    ImageBrush brush = new ImageBrush
    {
        ImageSource = new System.Windows.Media.Imaging.BitmapImage(new Uri("/Images/AppBackground.jpg", UriKind.Relative)),
        Opacity = 0.5d
    };
    this.RootFrame.Background = brush;
}