class TestViewMode : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        public string show;//顯示

        public string Show
        {
            get { return show; }
            set
            {
                show = value;
                PropertyChanged(this, new PropertyChangedEventArgs("Show"));
            }
        }
　　}

<TextBox x:Name="textBox" Text="{Binding  Path=Show, Mode=TwoWay}" />

    public partial class MainWindow : Window
    {
        TestViewMode vm =new TestViewMode();
        public MainWindow()                 
        {          
           this.DataContext = vm;
        }
    }

    class TestViewMode : INotifyPropertyChanged
    {
        // 定義靜態(tài)屬性值變化事件 
        public static event EventHandler<PropertyChangedEventArgs> StaticPropertyChanged;

        private static void OnStaticPropertyChanged([CallerMemberName] string propertyName = null)
        {
            OnStaticPropertyChanged(new PropertyChangedEventArgs(propertyName));
        }

        private static void OnStaticPropertyChanged(PropertyChangedEventArgs e)
        {
            StaticPropertyChanged?.Invoke(null, e);
        }
        private static string property1;
        // 定義靜態(tài)屬性
        public static string Property1
        {
            get => property1;
            set
            {
                property1 = value;
                OnStaticPropertyChanged();
            }
        }
    }

<TextBox x:Name="textBox" Text="{Binding  Path=Property1, Mode=TwoWay}" />

    public partial class MainWindow : Window
    {
        TestViewMode vm =new TestViewMode();
        public MainWindow()                 
        {          
           this.DataContext = vm;
        }
    }

TestViewMode.Property1 = "xxxxxx";