[Icon Extensions][Windows] Can't assign FontFamily on FontIcon extension

[morning4coffe-dev]

Describe the bug

When I specify the FontFamily on any FontIcon extension, I get an error that it Failed to assign to property 'CommunityToolkit.WinUI.FontIconExtension.FontFamily'. This is needed for the icon to render correctly on e.g. Android.
UnoCommunityToolkitExtBug.zip

Steps to reproduce

Specify the FontFamily on any FontIcon extension, as following:

HeaderIcon="{toolkit:FontIcon Glyph=, FontFamily={ThemeResource SymbolThemeFontFamily}}"

Expected behavior

Specifying the FontFamily should not throw an error on Windows as it does work well on other platforms.

Screenshots

No response

Code Platform

• UWP
• WinAppSDK / WinUI 3
• Web Assembly (WASM)
• Android
• iOS
• MacOS
• Linux / GTK

Windows Build Number

• Windows 10 1809 (Build 17763)
• Windows 10 1903 (Build 18362)
• Windows 10 1909 (Build 18363)
• Windows 10 2004 (Build 19041)
• Windows 10 20H2 (Build 19042)
• Windows 10 21H1 (Build 19043)
• Windows 10 21H2 (Build 19044)
• Windows 10 22H2 (Build 19045)
• Windows 11 21H2 (Build 22000)
• Other (specify)

Other Windows Build number

No response

App minimum and target SDK version

• Windows 10, version 1809 (Build 17763)
• Windows 10, version 1903 (Build 18362)
• Windows 10, version 1909 (Build 18363)
• Windows 10, version 2004 (Build 19041)
• Windows 10, version 2104 (Build 20348)
• Windows 11, version 22H2 (Build 22000)
• Other (specify)

Other SDK version

No response

Visual Studio Version

2022

Visual Studio Build Number

No response

Device form factor

No response

Additional context

No response

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[MartinZikmund]

I have hit this issue as well

[MartinZikmund]

Please try using StaticResource and see if it helps

[morning4coffe-dev]

@MartinZikmund You are right, this was the issue 🙃 the need for FontFamily on Uno targets should be resolved with unoplatform/uno#17591