Uno Platform: Reading JSON configuration file in Android project - xamarin

Question

I'm trying to integrate IConfiguration with the Uno Platform this way:
public class Startup
{
internal static void Init()
{
var assembly = Assembly.GetExecutingAssembly();
var resourceName = assembly.GetManifestResourceNames()
.FirstOrDefault(f => f.Contains("appsettings.json"));
if (!string.IsNullOrEmpty(resourceName))
{
using (var s = assembly.GetManifestResourceStream(resourceName))
{
//var content = s.ReadToEnd();
var host = new HostBuilder()
.ConfigureHostConfiguration(c =>
{
c.AddJsonStream(s);
})
.ConfigureServices((c, x) => ConfigureServices(c, x))
.ConfigureLogging(l => l.AddConsole(abc =>
{
abc.DisableColors = true;
}))
.Build();
}
}
}
I defined appsettings.json in my Shared project as Embedded Resource and copy always.
When running with UWP it runs successfully, but with Android it fails with the following error:
System.ArgumentException: 'The path must be absolute. Parameter name: root'
In my (other) Xamarin project, it works as expected with this addition:
.ConfigureHostConfiguration(c =>
{
c.AddCommandLine(new string[] { $"ContentRoot={Xamarin.Essentials.FileSystem.AppDataDirectory}" });
c.AddJsonStream(stream);
})
but Xamarin Essentials is out of the scope of the Uno Platform as I understand...

Answer 1

I ended up with the following
var resourcePrefix = "";
#if __IOS__
resourcePrefix = "UnoApp.iOS.";
#endif
#if __ANDROID__
resourcePrefix = "UnoApp.Droid.";
#endif
#if WINDOWS_UWP
resourcePrefix = "UnoApp.";
#endif
var assembly = IntrospectionExtensions.GetTypeInfo(typeof(Startup)).Assembly;
Stream stream = assembly.GetManifestResourceStream
(resourcePrefix + "appsettings.json");
var conf = new ConfigurationBuilder()
.AddJsonStream(stream);
Configuration = conf.Build();
services.AddSingleton(typeof(IConfiguration), Configuration);