C# Indexers is a simple implementation of key/value pairs using Dictionary type. Below is a sample implementation of a telephone directory -
TelephoneDirectory class
As seen above, we use the 'this[]' notation to create the public property that sets/returns indexed value.
We implement TelephoneDirectory as below in the main program -
See how the variable contact could be used as an array holding key value pairs which is just suitable for holding information such as needed for a telephone directory!
TelephoneDirectory class
using System.Collections.Generic; namespace Indexers { public class TelephoneDirectory { private readonly Dictionary<string, string> _dictionary =
new Dictionary<string, string>(); public string this[string key] { get { return _dictionary[key]; } set { _dictionary[key] = value; } } } }
As seen above, we use the 'this[]' notation to create the public property that sets/returns indexed value.
We implement TelephoneDirectory as below in the main program -
using System; namespace Indexers { public class Program { public static void Main(string[] args) { var contact = new TelephoneDirectory(); contact["name"] = "John"; contact["number"] = "3433433434"; Console.WriteLine("{0}'s phone number is {1}",
contact["name"], contact["number"]); } } }
See how the variable contact could be used as an array holding key value pairs which is just suitable for holding information such as needed for a telephone directory!
