using System;

using System.Linq;

using System.Linq.Dynamic.Core;

using System.Linq.Dynamic.Core.CustomTypeProviders;

public class Program

{

    [DynamicLinqType]

    public class User

    {

        public string UserName { get; set; }

​

        public string LastName { get; set; }

​

        public string GetFullName()

        {

            return $"{UserName} {LastName}";

        }

    }

    public static void Main()

    {

        var users = new [] { new User { UserName = "A", LastName = "B" }, new User { UserName = "C", LastName = "D" } }.AsQueryable();

​

        var result = users.Select("GetFullName()");

        result.Dump();

    }

}