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Editorial Team
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Asked: 2026-05-23T04:18:10+00:00

This is an open and shut case which will hopefully save someone a headache

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This is an open and shut case which will hopefully save someone a headache in the future.

I had the following line in Notepad (via OneNote) that I was pasting into a TextBlock to determine its visibility based on a property:

Visibility="{Binding IsPrinted, Converter={StaticResource VisibilityConverter}}"

However, this generated the following error:

Unexpected token Comma in Rule: 
MarkupExtension ::= '{' TYPENAME @(Arguments)? '}', 
in '{Binding IsPrinted, Converter={StaticResource VisibilityConverter}}'.

Everything appeared to be configured correctly and there was no discernible difference between this line and the line I’d copied it from in another UserControl, which worked fine.

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1 Answer

  1. Editorial Team

    The answer lies in the spaces.

    Removing and re-adding the three spaces (between Binding and IsPrinted, between the comma and Converter and between StaticResource and VisibilityConverter) resulted in a successful build.

    It appears that Visual Studio spaces and standard spaces are different, and never the twain shall mix – copying the line out of Visual Studio into OneNote and editing it there caused the spaces to become mismatched.

    The space characters are represented in Word as . for a standard space and a little o for a Visual Studio space. Using all of either in the line is fine, but mismatching them causes the error above.

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