using System;

using System.Collections.Generic;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        var testObject = new TestModel() {PoleOne = "odin"};

        var nullProps = GetNullPropertyNames(testObject);

        foreach(var nullProp in nullProps)

            Console.WriteLine(nullProp);

    }

    public static IReadOnlyCollection<string> GetNullPropertyNames<T>(T target)

    {

        var nullProperties = new List<string>();

        var properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

        foreach (var propertyInfo in properties)

        {

                var propertyValue = propertyInfo.GetValue(target);

            var readableNameAttribute = propertyInfo.GetCustomAttribute<HumanReadableNameAttribute>();

            if (propertyValue == null)

                nullProperties.Add(readableNameAttribute?.Name ?? propertyInfo.Name);

            }

        return nullProperties;

    }

}

​

public class TestModel {

    [HumanReadableName("pole odin")]

    public string PoleOne { get; set; }

    [HumanReadableName("readable prop 2")]

    public string PoleDva { get; set; }

    [HumanReadableName("readable prop 3")]

    public string PoleTri { get; set; }

}

​

[AttributeUsage(AttributeTargets.Property)]

public class HumanReadableNameAttribute : Attribute {

    public string Name { get; private set; }

    public HumanReadableNameAttribute(string name){

        Name = name;

    }

}