Xamarin Forms' WebView - local assets not found on Windows Phone

Question

I'm using WebView to display HTML from a string. This HTML references a stylesheet that I have locally on the device. I'm following the instructions from the official docs so the local CSS file can be accessed. It works fine on Android and iOS but I can't make it work on Windows Phone 8.1. I placed the CSS file in the root of the project and set the build action to Content, then set the BaseUrl to "" (I tried ms-appx-web:/// as well, with no success).

Does anyone know if the docs are missing some instructions? Or is it a bug in Forms? Any help would be appreciated.

Here's the code for populating the WebView with data (in a Forms PCL):

private async Task LoadData()
{
    string html = await _dataProvider.GetHtmlAsync("index");
    WebView.Source = new HtmlWebViewSource
    {
        Html = html,
        BaseUrl = _baseUrlProvider.Get()
    };
}

_baseUrlProvider is an instance of my WebViewBaseUrlProvider that is defined as follows:

internal class WebViewBaseUrlProvider : IWebViewBaseUrlProvider
{
    public string Get() => "";
}

---

EDIT:

Seeing this question leads me to believe that there indeed is a bug in Xamarin Forms. When the link in the HTML contains the whole ms-appx-web:///style.css instead of just style.css, it suddenly starts to work. Obviously, this is not quite cross-platform...

Answer 1

I just found the answer - Xamarin simply ignores the BaseUrl property: https://github.com/xamarin/Xamarin.Forms/blob/2d9288eee6e6f197364a64308183725e7bd561f9/Xamarin.Forms.Platform.WinRT/WebViewRenderer.cs#L26