Convert FileInfo read file code to maui equivalent - file

Question

I know I should know how to do this, but I don't.
I have some code (from a brilliant map routing packing called Itinero http://docs.itinero.tech/index.html) that reads in a a routerDb file.
It works great (in windows) if I use a fully qualified path as it is absolute, but I have moved the file into the Resources.Raw folder and want to read it properly.
The working code
using (var stream = new FileInfo(#"/path/to/my/file/gb.routerdb").OpenRead())
{
routerDb = RouterDb.Deserialize(stream);
}
How can I use the Maui approach to do the same thing? Such as or simpler
using (var stream = new xxx("gb.routerdb").xxxx)
{
routerDb = RouterDb.Deserialize(stream);
}
I'm looking at https://learn.microsoft.com/en-us/dotnet/maui/platform-integration/storage/file-system-helpers?tabs=windows but I don't get it :(
Thanks for any help.
G.

Answer 1

As document Platform differences of File system helpers mentioned, you can use method FileSystem.OpenAppPackageFileAsync to access file in the Resources\Raw folder as a MauiAsset.
Besides, if you want to access the path of the items in folder Raw, you can follow up the unknown issue about this:
https://github.com/dotnet/maui/issues/7943 .
Update：
As a test, I created a simple html(test.html) in folder Resource\Raw, and set BuildAction to MauiAsset.And I used the following code to read the html, it works well on my side(I tested on android device).
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
private async Task InitAsync()
{
string filePath = "test.html";
#if WINDOWS
var stream = await FileSystem.OpenAppPackageFileAsync("Assets/" + filePath);
#else
var stream = await FileSystem.OpenAppPackageFileAsync(filePath);
#endif
if (stream != null)
{
string s = (new System.IO.StreamReader(stream)).ReadToEnd();
this.MyWebView.Source = new HtmlWebViewSource { Html = s };
}
}
private void OnClicked(object sender, EventArgs e)
{
InitAsync();
}
}
MainPage.xaml
<VerticalStackLayout
Spacing="25"
Padding="30,0"
VerticalOptions="Center">
<WebView x:Name="MyWebView"
/>
<Button
x:Name="CounterBtn"
Text="Click me"
SemanticProperties.Hint="Counts the number of times you click"
Clicked="OnClicked"
HorizontalOptions="Center" />
</VerticalStackLayout>

Answer 2

Well I certainly appreciate the example code, but for some reason it didn't work for me, but what did work based on your code (#Jessie Zhang) was:
var stream = await FileSystem.OpenAppPackageFileAsync("gb.routerdb");
if (stream != null)
{
routerDb = RouterDb.Deserialize(stream);
}
The conditional didn't work and I'm not sure why, but I'm only using windows so I'll check that out later. Thanks