Log - Missing Fonts report

[danies8]

Description

Hi,

1. I got missing font OpenSansRegular.ttf although i removed them from project entirely and not appear in C:\Windows\Fonts..
2. I got missing font Segoe UI.ttf although it exist in my computer in C:\Windows\Fonts.
   

Steps to Reproduce

1.Create new MAUI app.
2. Comment
.ConfigureFonts(fonts =>
{
//fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
//fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
and remove these fonts from Resource/Fonts folder.

3. publish the maui as exe:

4. dotnet publish -f net9.0-windows10.0.19041.0 -c Release -p:WindowsPackageType=None -p:WindowsAppSDKSelfContained=true
   -p:RuntimeIdentifierOverride=win10-x64

5. I got this results in LOG:
   2025-03-19 12:11:52,454 [1] ERROR Microsoft.Maui.FontManager - Error loading font 'Assets/Fonts/OpenSansRegular.ttf'.
   System.InvalidOperationException: This operation is not supported for a relative URI.
   at System.Uri.get_LocalPath()
   at Microsoft.Maui.FontManager.FindFontFamilyName(String fontFile)
   2025-03-19 12:11:52,461 [1] ERROR Microsoft.Maui.FontManager - Error loading font 'Assets/Fonts/OpenSansRegular.otf'.
   System.InvalidOperationException: This operation is not supported for a relative URI.
   at System.Uri.get_LocalPath()
   at Microsoft.Maui.FontManager.FindFontFamilyName(String fontFile)
   2025-03-19 12:12:10,912 [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)
   2025-03-19 12:12:10,913 [1] ERROR Microsoft.Maui.FontManager - Error loading font 'Assets/Fonts/Segoe UI.otf'.
   System.InvalidOperationException: This operation is not supported for a relative URI.
   at System.Uri.get_LocalPath()
   at Microsoft.Maui.FontManager.FindFontFamilyName(String fontFile)

Link to public reproduction project repository

No response

Version with bug

9.0.30 SR3

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

....

Did you find any workaround?

NO

Relevant log output

I reported above.

[mattleibow]

Do you know if it works for a packaged app?

[danies8]

No. I do not use pacakge app.

[mattleibow]

I think we can say this is supposed to work and fall back to the OS fonts on all platforms.

[danies8]

What about segoui font that appears also in the log?

[HarishKumarSF4517]

This issue has been verified in Visual Studio 17.14.0 Preview 2.0 (versions 9.0.30 & 9.0.50). It can be reproduced on the Windows platform. I have attached the tested sample

FontsReport.zip

[danies8]

Did this bug it fixed ?

[baaaaif]

I can see this in sentry, too
9.0.70, packaged
I don't use Segoe UI myself at all

Error loading font 'Assets/Fonts/Segoe UI.otf'.

Newest

System.ArgumentException: Falscher Parameter.

"Assets/Fonts/Segoe UI.otf" ist kein gültiger absoluter URI.
  ?, in void ExceptionHelpers.ThrowExceptionForHR(int hr)+Throw(int hr)
  ?, in ObjectReferenceValue WinRTUriRuntimeClassFactory.CreateUriForMarshaling(string uri)
  ?, in ObjectReferenceValue Uri.CreateMarshaler2(Uri value)
  ?, in IntPtr _ICanvasFontSetFactoryMethods.Create(IObjectReference _obj, Uri uri)
  ?, in new CanvasFontSet(Uri uri)
  ?, in string FontManager.FindFontFamilyName(string fontFile)

[danies8]

@mattleibow
When it will be fixed?

[danies8]

When this bug it works?