using System;

using System.Linq;

using System.Linq.Expressions;

using System.Linq.Dynamic;

using System.Collections.Generic;

​

public class Program

{

    public class Person

    {

      public string Name { get; set; }

      public int Age { get; set; }

      public int Weight { get; set; }

      public DateTime FavouriteDay { get; set; }

    }

    public static void Main()

    {

        const string exp = @"!string.IsNullOrEmpty(Person.Name)";

          var p = Expression.Parameter(typeof(Person), "Person");

          var e = System.Linq.Dynamic.DynamicExpression.ParseLambda(new[] { p }, null, exp);

          var bob = new Person

          {

            Name = "Bob",

            Age = 30,

            Weight = 213,

            FavouriteDay = new DateTime(2000,1,1)

          };

        var john = new Person

          {

            Name = "john",

            Age = 30,

            Weight = 49,

            FavouriteDay = new DateTime(2000,1,1)

          };

        var persons = new List<Person>{bob,john};

        var result = persons.Where(x => (bool)e.Compile().DynamicInvoke(x) == true);

          Console.WriteLine(result.Count());

    }

}