using System;

using System.Collections.Generic;

using System.Linq;

using System.Linq.Expressions;

​

namespace Rextester

{

    public static class MemberCollector

    {

        public static HashSet<string> GetMembers(Expression e)

        {

            var tmp = new InternalMemberCollector();

            tmp.Visit(e);

            return tmp.FoundMembers;

        }

        class InternalMemberCollector : ExpressionVisitor

        {

            public HashSet<string> FoundMembers = new HashSet<string>();

            override protected Expression VisitMember (MemberExpression node)

            {

                FoundMembers.Add(node.Member.Name);

                return base.VisitMember(node);

            }

        }

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            Expression<Func<DateTime, bool>> e = dt => dt.Hour == 12 && dt.Minute % 10 == 0;

            foreach (var m in MemberCollector.GetMembers(e))

                Console.WriteLine(m);

        }

    }

}