using System;

using System.Linq.Expressions;

public class Program

{

    public static void Main()

    {

          var parameter = Expression.Parameter(typeof(Bar), "a");

            var bazProp = typeof(Bar).GetProperty(nameof(Bar.Baz));

            var body = Expression.GreaterThan(

                Expression.MakeMemberAccess(parameter, bazProp),

                Expression.Constant(55));

​

            Expression<Func<Bar, bool>> foo2 

                = Expression.Lambda<Func<Bar, bool>>(body, new[] { parameter });

    }

    public class Bar

    {

        public int Baz { get; set; }

    }

}