using System;

    using System.Collections.Generic;

    using System.Linq;

    using System.Linq.Expressions;

    public class Program

    {

        public static void Main()

        {

            Criteria c = new Criteria() { 

                Property = "Name", 

                Operator = "==", 

                Value = "Foo" };

            var queryable = (new List<Receipt>() { 

                new Receipt { Name = "Foo", Amount = 1 },

                new Receipt { Name = "Foo", Amount = 2 }, 

                new Receipt { Name = "Bar" }  

            }).AsQueryable();

            var parameter = Expression.Parameter(typeof(Receipt), "x");

            var property = Expression.Property(parameter, typeof(Receipt).GetProperty(c.Property));

            var constant = Expression.Constant(c.Value);

            var operation = Expression.Equal(property, constant);

            var expression = Expression.Call(

                typeof(Queryable),

                "Where",

                new Type[] { queryable.ElementType },

                queryable.Expression, 

                Expression.Lambda<Func<Receipt, bool>>(operation, new ParameterExpression[] { parameter })

            );

            Console.WriteLine("Linq Expression: {0} \n", expression.ToString());

            Console.WriteLine("Results: \n");

            var results = queryable.Provider.CreateQuery<Receipt>(expression);

            foreach(var r in results)

            {

                Console.WriteLine("{0}:{1}", r.Name, r.Amount);

            }

        }

    }

    public class Criteria

    {

        public string Property, Operator, Value;

    }

    public class ReceiptDetail

    {

        public string ItemName;

    }

    public class Receipt

    {

        public string Name { get; set; }

        public int Amount;

        public ICollection<ReceiptDetail> Details;

    }