C#在低于6.0版本实现nameof

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Linq.Expressions;

namespace ConsoleApp
{
    class Program
    {
        class People
        {
            public int ID { get; set; }
            public List<string> ListArr { get; set; }
        }

        static void Main(string[] args)
        {
            string s = "取代nameof";
            People people = new People();
            Console.WriteLine("---NameOf<T>(T t)---");
            Console.WriteLine(NameOf(new { people }));
            Console.WriteLine(NameOf(new { s }));
            Console.WriteLine(NameOf(new { people.ID }));
            Console.WriteLine(NameOf(new { people.ListArr }));
            Console.WriteLine();

            Console.WriteLine("---Expression<Func<T>>---");
            Console.WriteLine(NameOf(() => people));
            Console.WriteLine(NameOf(() => s));
            Console.WriteLine(NameOf(() => people.ID));
            Console.WriteLine(NameOf(() => people.ListArr));

            Console.ReadKey();
        }

        /// <summary>
        /// 利用匿名类型实现  参数t必须为匿名类型
        /// </summary>
        public static string NameOf<T>(T t) where T : class
        {
            return typeof(T).GetProperties().Select(s => s.Name).FirstOrDefault();
        }

        /// <summary>
        /// 利用lambda实现
        /// </summary>
        public static string NameOf<T>(Expression<Func<T>> expr)
        {
            return ((MemberExpression)expr.Body).Member.Name;
        }
    }

}

输出：