How set Image Source with C#

Question

Hi,

In C# I use FileOpenPicker to select the test.jpg, But it can't display the test.jpg.

1. C#

private async void button_addImage_Click(object sender, RoutedEventArgs e)
{
    FileOpenPicker fileOpenPicker = new FileOpenPicker();
    //fileOpenPicker.ViewMode = PickerViewMode.List;
    fileOpenPicker.ViewMode = PickerViewMode.Thumbnail;
    fileOpenPicker.SuggestedStartLocation = PickerLocationId.ComputerFolder;
    fileOpenPicker.FileTypeFilter.Add(".jpg");
    fileOpenPicker.FileTypeFilter.Add(".jpeg");
    fileOpenPicker.FileTypeFilter.Add(".png");

    StorageFile file = await fileOpenPicker.PickSingleFileAsync();
    if (file != null)
    {
        Uri uri = new Uri(file.Path, UriKind.RelativeOrAbsolute);
        image_show.Source = new BitmapImage(uri);
        
        button_addImage.Visibility = Visibility.Collapsed;
    }
}

2. XAML

<Grid Background="Orange" VerticalAlignment="Stretch">
    <!-- Source="ms-appx:///Assets/test.jpg" this is OK -->
    <Image x:Name="image_show" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Stretch="Uniform"/>
    <Button x:Name="button_addImage" Content="+" Click="button_addImage_Click">
</Grid>