uno platform: GetManifestResourceNames returns nothing

Question

For the Uno platform, I need to load an image from "content" resources. I'm using GetManifestResourceStream, but it's returning null while running the UWP project (I haven't tried the other flavors).

To dig a bit further, I added GetManifestResourceNames, but it is also returning an empty array.

Here's my code, which is inside a UserControl (Source is a property):

private void LoadBmpSrc()
{
  if (Source == null)
    return;

  Assembly assembly = GetType().GetTypeInfo().Assembly;
  string[] names = assembly.GetManifestResourceNames();
  using (Stream stream = assembly.GetManifestResourceStream(Source))
  {
    bmpSrc = SKBitmap.Decode(stream);
  }
}

In the consuming XAML file, I have this, inside a Grid:

  <controls:ExpandableImage 
    Grid.Column="0"
    Source="ms-appx:///Assets/icons/folder_tab.png" 
    />

If I swap in this code:

  <Image 
    Grid.Column="0" 
    Source="ms-appx:///Assets/icons/folder_tab.png" 
    />

the image displays.

EDIT

Here's the XAML for the control:

<UserControl
  x:Class="UnoTest.Shared.Controls.ExpandableImage"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="using:UnoTest.Shared.Controls"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  xmlns:skia="using:SkiaSharp.Views.UWP"
  >

  <skia:SKXamlCanvas x:Name="EICanvas" PaintSurface="OnPaintSurface" />
  
</UserControl>

Answer 1

Your problem is basically that the Content images are not treated as Resources.

If you want to include images as a Resource you will need to change the Build Action of that file into Embedded Resource. Once you change this it will show up in the

string[] names = assembly.GetManifestResourceNames();

method call.

You will notice that the name of the image will be something like ApplicationName.Directory.ImageName.png. You will need to specify this name in order to load the image with the

assembly.GetManifestResourceStream(imageName)

If you want to load a Content Image data and into a Stream you could do that (haven't test it) with the following code:

var imageUrl = "ms-appx:///Assets/SplashScreen.png";
var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri(imageUrl));
        
using(var stream = await file.OpenStreamForReadAsync())
{
   //Use your data here
}

Hope this helps.-