Implementing validation for all WPF TextBoxes

Question

My program has got tens of TextBoxes, which all could use one common Validation Rule. The rule itself is not very complex: it would only prevent the use of a semicolon (;).

Does there exist any way to implement it (more easily than applying the same rule manually to all TextBoxes)?

Edit: I cannot see how it could be related to How to use IDataErrorInfo.Error in a WPF program? - I have no problems applying the validation to a TextBox (or displaying the error in a ToolTip).

you may consider not explicitly declaring them, but inserting them in a list. Then the validation can be applied to the whole list. — farbiondriven, Mar 13 '19 at 10:45
Implement your own behavior for that, just ibherit `Behavior` class — Pavel Anikhouski, Mar 13 '19 at 11:18
Possible duplicate of [How to use IDataErrorInfo.Error in a WPF program?](https://stackoverflow.com/questions/14023552/how-to-use-idataerrorinfo-error-in-a-wpf-program) — Eriawan Kusumawardhono, Mar 14 '19 at 04:09

score 0 · Answer 1 · answered Mar 14 '19 at 13:18

0

You could write a custom markup extension that extends Binding and adds the ValidationRule:

public class CustomBinding : Binding
{
    public CustomBinding(string path)
        : base(path)
    {
        this.ValidationRules.Add(new YourValidationRule())
    }
}

You would then use this one instead of the usual {Binding} when you set up your bindings in XAML, e.g.:

<TextBox Text="{local:CustomBinding SourceProperty}" />

answered Mar 14 '19 at 13:18

mm8

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@Alex: Did you try this? – mm8 Mar 15 '19 at 15:26
It seems that it is impossible to create what I am asking without some additions to the XAML of the TextBoxes. This looks like to be the most simple solution, I'll give it a go. Thanks! – Alex Mar 18 '19 at 08:08

Implementing validation for all WPF TextBoxes

1 Answers1