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Asked: 2026-06-04T22:26:46+00:00

Since a few days back the WPF editor no longer works. Whenever I click

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Since a few days back the WPF editor no longer works. Whenever I click somewhere in any editor it becomes disabled with this message: 

'NullReferenceException was thrown on "DataTemplate": ... (etc.)'

I have spent a few hours trying to locate the problem without success so if anyone could give a hint on where to look I would greatly appreciate it.

I have tried to debug with CLR exceptions enabled when thrown (VS2010->Debug->Exceptions…->Common Language Exceptions (Thrown) ‘Checked’) but I get no exceptions from it.

Apparently there’s a problem some DataTemplate somewhere that’s only showing in design time but I just can’t figure out how to locate it.

Cheers

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1 Answer

  1. Editorial Team

    I finally traced the problem to a small markup extension I wrote. Having removed it the DataTemplaring system stopped behaving badly.

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