Question

How to use dictionary indexer in C#

Answer 1

using System;
using System.Collections.Generic;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<int, int> dictionary = new Dictionary<int, int>();

            dictionary[1] = 178;
            dictionary[2] = 9813;

            Console.WriteLine(dictionary[1]);
            Console.WriteLine(dictionary[2]);
            Console.WriteLine(dictionary[3]); // exception - element not exists
        }
    }
}

/*
run:

178
9813

Unhandled Exception: System.Collections.Generic.KeyNotFoundException: The given
key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at ConsoleApplication_C_Sharp.Program.Main(String[] args) in d:\Conso
leApplication_C_Sharp\ConsoleApplication_C_Sharp\Program.cs:line 17

*/

 

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