How can I restrict the values a user enters into TextBox?

Question

Users of my application can enter values into TextBoxes. In some cases the values need to be restricted to a certain range, e.g. 0 to 1, or 1 to 50. In other cases they can only enter upto 13 or 20 characters depending.

Can I use Binding.StringFormat to enforce these ranges? If so,

what do I need to specify to restrict values to a certain character length?
what do I need to specify to restrict values to a certain range?

If not, what's the best way to implement this?

Why not just use a Slider control for the numeric values? – Scroog1 Apr 13 '12 at 14:33 — Scroog1, Apr 13 '12 at 14:33

score 3 · Answer 1 · edited May 23 '17 at 10:31

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What you want is input validation. For starters this tutorial on MSDN will help you, more information on IDataErrorInfo (preferred way) can be obtained here.

This question was already a topic on SO: WPF Data Binding and Validation Rules Best Practices

edited May 23 '17 at 10:31

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answered Apr 13 '12 at 14:06

Matten

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That sounds like something completely different - IMO there is difference between notifying input is not valid and disallowing invalid input. – wondra Jan 14 '20 at 10:11

score 1 · Answer 2 · edited May 23 '17 at 11:46

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The Vaildation in WPF Code Project should give you a good start.

Also the related question WPF Validators like ASP.NET should assist.

edited May 23 '17 at 11:46

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answered Apr 13 '12 at 14:05

Joshua Drake

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I agree with Joshua Drake. Use Validation. I have an example of how to do the Validation for you. http://www.wpfsharp.com/2012/02/03/how-to-disable-a-button-on-textbox-validationerrors-in-wpf/ – Rhyous Apr 13 '12 at 15:33

score 1 · Answer 3 · answered Apr 13 '12 at 14:06

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You need to use Input mask, Check out this article WPF Maskable TextBox for Numeric Values

Based on this article in Events TextBox_PreviewTextInput and TextBoxPastingEventHandler you could check for a range.

answered Apr 13 '12 at 14:06

Habib

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score -1 · Answer 4 · edited Nov 21 '12 at 04:37

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The text box length property should solve

Textbox.maxlength= 10;

edited Nov 21 '12 at 04:37

rahul

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answered Apr 13 '12 at 14:27

Kiran

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How can I restrict the values a user enters into TextBox?

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