runceel

class ViewModel
{
    public ReactiveProperty<string> Input { get; }
    public ReactiveProperty<string> Output { get; }

    public ViewModel()
    {
        Input = new ReactiveProperty("");
        Output = Input
            .Delay(TimeSpan.FromSecond(1)) // Using a Rx method.

runceel

<TextBlock Text="{Binding Message.Value}" />

runceel

var viewModel = new SomeViewModel();
viewModel.Message.Value = "Hello world"; // set a value
Console.WriteLine(viewModel.Message.Value); // get a value

runceel

public interface IReactiveProperty<T> : IObservable<T>, INotifyPropertyChanged
{
  T Value { get; set; }
}

public class ReactiveProperty<T> : IReactiveProperty<T>
{
  public event PropertyChangedEventHandler PropertyChanged;
  
  private T _value;

runceel

public class SomeViewModel // You don't need implementation of INotifyPropertyChanged
{
  public ReactiveProperty<string> Message { get; } = new ReactiveProperty<string>();
}

runceel

public class SomeViewModel : BindableBase
{
  private string _message;
  public string Message
  {
    get { return _message; }
    set { SetProperty(ref _message, value); }
  }
}

runceel

public class BindableBase : INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;
  protected virtual bool SetProperty<T>(ref T field, T value, [CallerMemberName]string propertyName)
  {
    if (EqualityComparer<T>.Default.Equals(storage, value)) return false;

    storage = value;
    RaisePropertyChanged(propertyName);
    return true;

runceel

public class SomeViewModel : INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;
  
  private string _message;
  public string Message
  {
    get { return _message; }
    set
    {

runceel

using Moq;
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApp10
{
    class Program
    {

runceel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Unity;
using Unity.Lifetime;

namespace LINQLab
{
    class Program