Set a ValidationError by Code in ViewModel

Question

I came across Set a ValidationError by Code, by Christian Mosers

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);

How can I use this in my ViewModel?

brunnerh · Accepted Answer · 2011-09-01 15:49:41Z

3

There are other ways to get errors out of the VM, for example by implementing IDataErrorInfo or by throwing exceptions in setters (the binding then needs to validate on exception).

edited Sep 1, 2011 at 15:49

answered Sep 1, 2011 at 15:44

brunnerh

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2 Comments

VoodooChild Over a year ago

Thanks and +1 for you answer, I was aware of the IDataErrorInfo (should've mentioned that in my question). If you get a chance could you also provide comments or some code showing how to use the technique from Christina Mosers with regards to the question?

brunnerh Over a year ago

@VoodooChild: As far as i am aware you should not have a reference to UI-elements in your VM, and the approach mentioned requires you to have a reference to the UI-element which displays your data. That being the case i do not think it is suited for this pattern.

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