The indexer of C #

Actually do not use this thing, only do understand

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespaceIndexer {classProgram {Static voidMain (string[] args) {Person P=NewPerson (); p[0] =1; p[1] =2; p[2] =3; p[3] =4; p[4] =5; foreach(varIteminchp.numbers)            {Console.WriteLine (item); } p["0"] ="1"; p["1"] ="2"; p["2"] ="3"; p["3"] ="4"; p["4"] ="5"; Console.WriteLine (p["0"]);        Console.ReadLine (); }    }    classPerson {Private int[] _numbers =New int[5];  Public int[] Numbers {Get{return_numbers;} Set{_numbers =value;} }        //Indexer, which allows an object to manipulate an array in an indexed manner         Public int  This[intIndex] {            Get{return_numbers[index];} Set{_numbers[index] =value;} } Dictionary<string,string> dic =Newdictionary<string,string>();  Public string  This[stringIndex] {            Set{Dic[index] =value;} Get{returnDic[index];} }    }}

The indexer of C #