check if value in textbox is valid

Question

I have a textbox with a validator that permits only integer values. How do I check if text in my textbox represents a correct integer value without checking the text itself?

I am using Prism MVVM so I would like to hear some solution like "bind a validator property to your viewmodel/model code", but a generic WPF solution is also fine.

The problem is that I can't get the incorrect value in my model / viewmodel. If the value is incorrect, then the underlying binded property doesn't get set.

devdigital · Accepted Answer · 2012-02-07 09:45:17Z

1

You could use IDataErrorInfo, or Data Annotations. The Data Annotations Extensions project contains an Integer attribute.

answered Feb 7, 2012 at 9:45

devdigital

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3 Comments

Rachel Over a year ago

+1 for IDataErrorInfo. Even if you use DataAnnotations, you should still use IDataErrorInfo as well since WPF is built to work with it.

Bogdan Verbenets Over a year ago

I don't see how I can use IDataErrorInfo. I can't get the incorrect value in my model or viewmodel, I can see only the correct value. If current value is incorrect, then it won't get passed to the viewmodel/model.

devdigital Over a year ago

See stackoverflow.com/questions/9157894/…. You could use an IValueConverter to always return a valid integer so that your view model is updated.

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