// @nuget: Z.Expressions.Eval

​

using System;

using Z.Expressions;

using System.Dynamic;

using System.Linq;

​

public class Program

{

        public class AppUser 

    {

        public string Name { get; set; }

        public int? Age { get; set; }

    }

    public static void Main()

    {

        var lst = Enumerable.Range(1, 10).Select(x => new AppUser() { Name = "1", Age = x }).ToList();

​

        //Eval.Execute("({0}).GroupBy(x => x.Name, (x0, y0) => new { value = x0, field = Name, aggregates = new { sum = y0.Sum(g => g?.Age), max = y0.Max(g => g?.Age) } }).ToList()", lst);

    }

}