[Bug] Unable to bind Glyph property in FontImageSource of ToolbarItem

[maxkoshevoi]

Description

Original discussion: https://forums.xamarin.com/discussion/180852/why-glyph-property-in-fontimagesource-doesnt-bind

This code doesn't produce any errors, but Glyph is always empty (getter of MyIcon is newer executed):

<ContentPage.ToolbarItems>            
    <ToolbarItem>
        <ToolbarItem.IconImageSource>
            <FontImageSource Glyph="{Binding MyIcon}" FontFamily="{x:StaticResource MaterialFontFamily}" />
        </ToolbarItem.IconImageSource>
    </ToolbarItem>
</ContentPage.ToolbarItems>

Static binding works fine.

Steps to Reproduce

1. Add ToolbarItem to your page
2. SpecifyIconImageSource to it as FontImageSource with binded Glyph

Expected Behavior

I can see binded icon.

Actual Behavior

ToolbarItem has no icon

Basic Information

• Version with issue: 4.8.0.1560
• Last known good version: -
• IDE: VS2019
• Platform Target Frameworks:
  • iOS: -
  • Android: 11
  • UWP: -
• Android Support Library Version: -
• Nuget Packages:
• Affected Devices:

Screenshots

Reproduction Link

Thanks igorkr_10.

GlyphToolbarItem.zip

Workaround

Thanks Saskia.

<ToolbarItem IconImageSource="{Binding MyIcon, Converter={converters:ToolbarIconValueConverter}}" />

public class ToolbarIconValueConverter : IValueConverter, IMarkupExtension
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return new FontImageSource
        {
            FontFamily = (OnPlatform<string>)Application.Current.Resources["MaterialFontFamily"],
            Glyph = (string)value
        };
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    public object ProvideValue(IServiceProvider serviceProvider)
    {
        return this;
    }
}

[acaliaro]

Hi guys, some news on this?

[KeithBoynton]

I just burned a few hours on this too until I came across this bug. Definitely needs fixing.

[nZeus]

The binding worked for us, after we changed the value from  format to \uf0c9

[krunalc]

@nZeus's fix above worked for me.

[FlorianAuer]

@nZeus' fix works like a charm. Keep in mind: No ';' and all lowercase.