using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var t = new Test { Foo = "Hello world" };

        var tracked = new List<(Test Object, Dictionary<string, object> Properties)>();

        var currentProperties = GetProps(t); // capture properties

        tracked.Add((t, currentProperties)); // add reference and captured properties

​

        var capturedFoo1 = tracked[0].Properties["Foo"].ToString();

        var capturedBar1 = (List<string>) tracked[0].Properties["Bar"];

        Console.WriteLine($"Expected '{t.Foo}' Actual: '{capturedFoo1}'");

        Console.WriteLine($"Expected 0 Actual: {(capturedBar1.Count())}");

        Console.WriteLine(Environment.NewLine);

​

        // these should not update in the dictionary but they do?

        t.Foo = "bye"; 

        t.Bar.Add("1");

​

        var capturedFoo2 = tracked[0].Properties["Foo"].ToString();

        var capturedBar2 = (List<string>) tracked[0].Properties["Bar"];

        Console.WriteLine($"Expected 'Hello world' Actual: '{capturedFoo2}'");

        Console.WriteLine($"Expected 0 Actual: {(capturedBar2.Count())}");

    }

    public static Dictionary<string, object> GetProps(Test t)

        => t.GetType().GetProperties().ToDictionary(p => p.Name, p => p.GetValue(t));

​

    public class Test

    {

        public string Foo { get; set; }

        public List<string> Bar {get;set;} = new();

    }

}