using System;

using System.Collections.Generic;

using System.Linq;

​

namespace ReflectionTechnique

{

    class Program

    {

        static void Main(string[] args)

        {

            // A few simple lines to make sure the indexer property is working

            Customer customer = new Customer("Cust1", "Miami", 123.34m);

​

            // Get the value of the Customer.Name and City property by using the indexer property.

            // You can see that customer.Sales still works. It could have been written customer["Sales"] of course.

            Console.WriteLine($"{customer["Name"]} is in {customer["City"]}. The sales are {customer.Sales}");

​

            // You can also use the indexer property to SET the property value.

            //

            customer["City"] = "Toledo";

            Console.WriteLine($"The city after executing \ncustomer[\"City\"] = \"Toledo\" \nis {customer["City"]}.");

​

            /////////////////////////////////////////////////////////////////////////////////////////

            // Here, we show how to use the indexer in a LINQ query.

            //

            // create a list of customers and ouput them sorted by Name, Sales, and City.

            List<Customer> customers = GetCustomers();   // hard-coded list

            DisplaySortedCustomers("Name", customers);

            DisplaySortedCustomers("Sales", customers);

            DisplaySortedCustomers("City", customers);

            //Console.ReadLine();

        }

        public static void DisplaySortedCustomers(string ColumnName, List<Customer> customers)

        {

            Console.WriteLine($"\n\nSorted by '{ColumnName}'\n--------------------");

            OutputCustomers(SortCustomers(customers, ColumnName));

        }

        public static void OutputCustomers(List<Customer> customers)

        {

            foreach (var c in customers)

            {

                Console.WriteLine($"{c.Name}, {c.City}, {c.Sales}");

            }

        }

        public static List<Customer> SortCustomers(List<Customer> customers, string SortByColumn)

        {

            return customers.OrderBy(x => x[SortByColumn]).ToList();

        }

        public static List<Customer> GetCustomers()

        {

            List<Customer> customers = new List<Customer>();

            customers.Add(new Customer("Lynn", "Miami", 100.00m));

            customers.Add(new Customer("Diana", "West Palm Beach", 200.00m));                         

            customers.Add(new Customer("Brianna", "Chicago", 300.00m));

            return customers;

        }

    }

​

    // Inheriting from IndexerProperty allows us to reference properties by name: customer["Name"]

    public class Customer : IndexerProperty

    {

        public Customer(string Name, string City, decimal Sales)

        {

            this.Name = Name;

            this.City = City;

            this.Sales = Sales;

        }

​

        public string Name { get; set; }

        public string City { get; set; }

        public decimal Sales { get; set; }

    }

​

    // Have any class to which you want to give indexer properties inherit from this class, as shown above in the Customer class. 

    public class IndexerProperty

    {

        public object this[string propertyName]

        {

            get { return this.GetType().GetProperty(propertyName).GetValue(this); }

            set { this.GetType().GetProperty(propertyName).SetValue(this, value); }

        }

    }

}

​