Regression in .740: C1Combo as C1FlexGrid editor crashes for null value

Regression in .740: C1Combo as C1FlexGrid editor crashes for null value

Posted by: wknauf on 31 December 2025, 4:02 am EST

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  wknauf

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  Posted 31 December 2025, 4:02 am EST - Updated 31 December 2025, 4:07 am EST

  I don’t have a sample, but the crash is obvious:
  
  If you use a C1.Win.List.C1Combo as C1FlexGrid editor, and the cell contains a null value, it crashes on setting the text to the combo, as “value.ToString” is called for a null value.

  

  1257×515 114 KB

  I think we are not affected by this issue, because our only C1Combo grid editor already implemented “IEmbeddedEditor” and used a real object instead of a string. I was just pointed to the problem because our combobox implementation now reported several warnings like “MyCustomCombo.SetFormat(string)’ hides inherited member ‘C1Combo.SetFormat(string)’. Use the new keyword if hiding was intended.”. After commenting our custom code, the exception came up because of null values in the cell.

  Best regards

  Wolfgang

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  kartik.dua

  

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  Posted 31 December 2025, 8:00 am EST

  Hi Wolfgang,

  Thank you for pointing out the error code. We have reported it to the development team and will let you know the updates as soon as possible.

  [Internal Tracking ID: C1WIN-34866]

  Best Regards,
  
  Kartik