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Set a ValidationError by Code
A ValidatioRule in a BindingExpression only triggers, when the target side of the binding changes. If you want to set a validation error by code you can use the following snippet.
Set the validation error
ValidationError validationError =
new ValidationError(regexValidationRule,
textBox.GetBindingExpression(TextBox.TextProperty));
validationError.ErrorContent = "This is not a valid e-mail address";
Validation.MarkInvalid(
textBox.GetBindingExpression(TextBox.TextProperty),
validationError);
Clear the validation error
Validation.ClearInvalid(textBox.GetBindingExpression(TextBox.TextProperty));
 Comments on this article
Show all comments
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| Christian | |
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| Commented on 3.March 2009 |
| Don't have much help for a beginner like me.
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| Alexandra | |
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| Commented on 19.March 2009 |
| Great tip, this helped me a lot! Keep 'em coming!
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| Yuri | |
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| Commented on 19.April 2009 |
| What is it - regexValidationRule?
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| Gergely... | |
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| Commented on 12.November 2009 |
| Regular Expression ... Google.com :)
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| balwat singh | |
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| Commented on 21.April 2010 |
who to use validation inside WPF.
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| ashish | |
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| Commented on 3.August 2010 |
| wha the fuck is this ?
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| hi | |
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| Commented on 7.August 2010 |
| chethi venna mudda chengal malthadu
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| Christian MOSER | |
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| Commented on 23.August 2010 |
| I apprieciate your feedback but I cant explain it anymore in depth because I just copy and pasted this from another website
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