Nsryjdtyk

I have simple class with one property, this class implements the interface INotifyPropertyChange.

    public class SomeClass : INotifyPropertyChanged

    {

        private string _iD;



        public event PropertyChangedEventHandler PropertyChanged;



        private void NotifyPropertyChanged(string info)

        {

            if (PropertyChanged != null)

            {

                PropertyChanged(this, new PropertyChangedEventArgs(info));

            }

        }



        public string ID

        {

            get { return _iD; }

            set

            {

                if (String.IsNullOrEmpty(value))

                    throw new ArgumentNullException("ID can not be null or empty");



                if (this.ID != value)

                {

                    _iD = value;

                    NotifyPropertyChanged(ID);

                }

            }

        }

    }

I am trying make a OneWay binding to a label. I set the label's DataContext in the code behind.

    private SomeClass _myObject;



    public MainWindow()

    {

        InitializeComponent();

        _myObject = new SomeClass() { ID = "SomeID" };

        lb.DataContext = _myObject;

    }

In the XAML I am binding the property ID to the Content of the label.

    <Label Name="lb" Content="{Binding Path = ID, Mode=OneWay}" Grid.Row="0"></Label>

    <TextBox Name="tb" Grid.Row="1"></TextBox>

    <Button Name="btn" Content="Change" Height="20" Width="100" Grid.Row="2" Click="btn_Click"></Button>

Then I change value of property ID in the button click event, but the content of label isn't changing.

    private void btn_Click(object sender, RoutedEventArgs e)

    {

        _myObject.ID = tb.Text;

        Title = _myObject.ID;

    }

Why is this not working?

NotifyPropertyChanged should take the name of the changed property and not the value of the property. So change NotifyPropertyChanged(ID) to NotifyPropertyChanged("ID").