using System;

using System.Collections.Generic;

using System.Data.Entity;

using System.Linq;

using System.Linq.Expressions;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        List<string> fruits = new List<string> { "grape", "passionfruit", "banana", "mango", "orange", "raspberry", "apple", "blueberry" };

        IEnumerable<string> query = fruits.AsEnumerable();

        Expression<Func<string, object>> byLength = s => s.Length;

        Expression<Func<string, object>> byAlpha  = s => s;

        var filters = new List<Expression<Func<string, object>>> { 

            byLength, byAlpha

        };

        var first = true;

        foreach (var filter in filters) {

            if (first) {

                query = query.OrderBy(filter.Compile());

                first = false;

            } else {

                query = (query as IOrderedEnumerable<string>).ThenBy(filter.Compile());

            }

        }

        foreach (string fruit in query)

        {

            Console.WriteLine(fruit);

        }

    }

}