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435
XamNumericInput & DataErrors
posted

Hi Infragistics,

We're finding that this control (and I assume all other XamMaskedInput) derivatives are just not working well with MVVM.

Take for example this scenario...

We've set the following ValueConstraint in a style...

<Setter Property="ValueConstraint">

    <Setter.Value>

        <ig:ValueConstraint ValidateAsType="Integer32" MinInclusive="10" MaxInclusive="1000"/>

    </Setter.Value>

</Setter>

If the user types an invalid value (e.g. 5) a message is displayed (if the InvalidValueBehavior is DisplayErrorMessage) and the source property it's bound to is updated (see my other thread about that).

Once you click ok, it's possible to then freely click on another control and both the control and model now have incorrect values.

Given that we're using the standard .Net IDataErrorInfo interface, our View Model now thinks there are no validation errors. Basically the use of a MessageBox just doesn't work with binding & MVVM.

Why not introduce another InvalidValueBehavior of RaiseDataError?