Change Background Color for WPF textbox in changed-state

Question

I have a class EmployeeViewModel with 2 properties \"FirstName\" and \"LastName\". The class also has a dictionary with the changes of the properties. (The class implements

Answer 1

A complete diferent way would be to not implement INotifyPropertyChanged and instead descend from DependencyObject or UIElement

They implement the binding using DependencyProperty You may event use only one event handler and user e.Property to find the rigth textbox

I'm pretty sure the e.NewValue != e.OldValue check is redundant as the binding should not have changed. I also beleive there may be a way to implement the binding so the dependecyObject is the textbox and not your object...

Edit if you already inherit from any WPF class (like control or usercontrol) you are probably ok and you don't need to change to UIElement as most of WPF inherit from that class

Then you can have:

using System.Windows;
namespace YourNameSpace
{
class PersonViewer:UIElement
{

    //DependencyProperty FirstName
    public static readonly DependencyProperty FirstNameProperty =
        DependencyProperty.Register("FirstName", typeof (string), typeof (PersonViewer),
                                    new FrameworkPropertyMetadata("DefaultPersonName", FirstNameChangedCallback));

    public string FirstName {
        set { SetValue(FirstNameProperty, value); }
        get { return (string) GetValue(FirstNameProperty); }
    }

    private static void FirstNameChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) {

        PersonViewer owner = d as PersonViewer;
        if (owner != null) {
            if(e.NewValue != e.OldValue && e.NewValue != "DefaultPersonName" ) {

                //Set Textbox to changed state here

            }
        }

    }

    public void AcceptPersonChanges() {

        //Set Textbox to not changed here

    }

 }
}