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Editorial Team
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Asked: 2026-06-15T10:18:47+00:00

I implemented custom validation rules to use with TextBoxes in my WPF project. I

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I implemented custom validation rules to use with TextBoxes in my WPF project. I have the following problem:

If, for example, I have a textbox for entering double values, after validation errors (e.g. for typing “30.0” I have to get a validation error when text is “30.”) the validation / binding mechanism converts double representation of integer numbers (“30.0”) to int representation (“30”).
If I keep the validation rules but return always ValidationResult.ValidResult or remove the validation rules, the value does not change and remains “30.0”.

How can I fix it / workaround it?

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1 Answer

  1. Editorial Team

    You can control when the binding fires. If it happens on each keystroke, then you’ll have a problem with the invalid intermediate 30. case, as you describe.

    You might like to look at adding UpdateSourceTrigger=LostFocus to your Binding.

    There’s some more information here: http://msdn.microsoft.com/en-us/library/ms754356.aspx

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