Error loading font 'Assets/Fonts/Segoe UI.ttf'. on log

Question

Hi,

I have this error when running the MAUI as exe.

I do not have this fonts on my app in RESOURCES/FONTS and not resister it.

2025-03-13 11:57:26,921 [1] ERROR Microsoft.Maui.FontManager - Error loading font 'Assets/Fonts/Segoe UI.ttf'.

System.InvalidOperationException: This operation is not supported for a relative URI.

at System.Uri.get_LocalPath()

at Microsoft.Maui.FontManager.FindFontFamilyName(String fontFile)

2025-03-13 11:57:26,940 [1] ERROR Microsoft.Maui.FontManager - Error loading font 'Assets/Fonts/Segoe UI.otf'.

Thanks,

Answer 1

Hello,

This is a bug specific to unpackaged distributions. You can refer to the known thread in github for a solution or wait for the development team to fix it.

• Label:[WinUI] FontFamily is not recognized in Unpackaged application. #9104.

This is a workaround for apps that are experiencing this:

#if WINDOWS
Microsoft.Maui.Handlers.LabelHandler.Mapper.AppendToMapping("FontFamily", (handler, element) =>
{
    if (element.Font.Family == "FontAwesome")
    {
        const string FontAwesomeFamily = "ms-appx:///Fontawesome6brands.otf#Font Awesome 6 Brands";
        handler.PlatformView.FontFamily = new Microsoft.UI.Xaml.Media.FontFamily(FontAwesomeFamily);
    }
});
#endif

I am looking into why this is happening as the code is the same and should produce the same result packaged/unpackaged...

Best Regards,

Alec Liu.

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