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WPF Validation. What is happening during the UpdatedValue step and CommittedValue step

Posted on 2014-09-25
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Last Modified: 2014-10-01
I'm trying to understand the validation steps that data passes along from target to source.
in the setter of a property which line of code represents each step, (or for the CommittedValue step is that after the setter code has terminated)?
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Question by:quentinA
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The process of validating user input and updating the source now looks like this (using a TextBox bound to a source property of type int, as an example):
1. Run the ValidationRules marked as RawProposedValue, using the (string) value in TextBox.Text
2. Convert the string value to int, using user-supplied and/or built-in converters
3. Run the ValidationRules marked as ConvertedProposedValue, using the int value
4. Write the (int) value into the source property
5. Run the ValidationRules marked as UpdatedValue
6. Commit the source object, if applicable (this means calling IEditableObject.EndEdit() )
7. Run the ValidationRules marked as CommittedValue

If any of the validation rules fail, the process stops and validation errors are routed to the usual places.

This feature is scheduled to be included in WPF 3.5SP1.



From microsoft team: https://connect.microsoft.com/VisualStudio/feedback/details/299711/wpf-validationrule-is-called-before-ivalueconverter
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