Why my binding do not work ?

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C#

WPF

Hello

I don't understand why my binding do not work.

I have an XML file with a Binding Text :

<TextBlock TextWrapping="Wrap" Text="{Binding strSelectionLignes}" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2" />

In my C# code, i have been use INotifyPropertyChanged :

public partial class ParamsAffichage : Window, INotifyPropertyChanged
    {
        #region Évenement qui permet de déclencher l'événement INotifyPropertyChanged et mettre à jour le binding
        public void Set<TValue>(ref TValue field, TValue newValue, [CallerMemberName] string propertyName = "")
        {
            if (EqualityComparer<TValue>.Default.Equals(field, default(TValue)) || !field.Equals(newValue))
            {
                field = newValue;

                if (PropertyChanged != null)
                    PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        #endregion

        private string _strSelectionLignes;
        public string strSelectionLignes
        {
            get { return _strSelectionLignes; }
            set { Set(ref _strSelectionLignes, value); }
        }

I modify my varaible strSelectionLignes :

 public ParamsAffichage()
        {
            InitializeComponent();

            strSelectionLignes = "TEST";
}

But "TEST" is not visible in my form

Why ?

Thank you very much

What I have tried:

I try in debug, in this test :

if (PropertyChanged != null)
                   PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));

PropertyChanged is alwys null.