[WPF C#]Get UserControl or VisualTree in DataValidation of TextBlock

Question

Hy,

I have a validator set on the text property of a textblock. For a correct validation I would need the parent usercontrol of the textblock, but the only things I have in the validator are the value object (a string) and the culture (doesn't help either).

Does anyone know a way to get certain usercontrols in a class/a method where I have no access to any kind of visual or control of my application.

The problem could be solve if I could give the validator the usercontrol or the textblock as parameters, but I didn't find a way to do so..

Thank you very much for your answers.

Greets

Answer 1

You could try validating using two validation properties built into the Binding class: ValidatesOnExceptions and ValidatesOnDataErrors.

With ValidatesOnExceptions, the binding is invalid if an exception is thrown during the conversion process. In this case, you could create a custom converter, pass the user control as a parameter, and then throw an exception in the converter if the binding was invalid.

<Binding ValidatesOnExceptions="True"/>

With ValidatesOnDataErrors, the binding is invalid if the source implements IDataErrorInfo and returns a non-null/empty string for the IDataErrorInfo.Error property. If your source does or could implement this interface, you could validate the data on the source side.

<Binding ValidatesOnDataErrors="True"/>