I have a View which contains the userprofile of the current user. The view contains a viewmodel with a two-way binding to the single attributes like username or email adress. The view also has a behaviour, which validates the input and shows an error, of the input is not valid. Because of the two-way binding, the viewmodel updates the value even if the behavior says the input is wrong. I need to solve that.
My current approach is to use include the behavior in the viewmodel as a attribute. So I can access the attributes of the behavior in the setter of the attributes in the viewmodel. So I cant stop the update to the wrong inputs. But I can not get access the behavior from my viewmodel in the xaml of the view. Is that a way I can do it at all?
My next approach would be to pass the "isValid" attribute of the behavior to the viewmodel. But here again, I don't know how to do it, is it possible at all?
Last approach would be to create a command in the viewmodel, binding it to a new button in the userprofile, using a one-way binding and somehow pass the inputs from the view to the command and updateing the userprofile.
May be here is someone who can help me?