Question

How to use Array.AsReadOnly() in C#

Answer 1

using System;
using System.Collections.ObjectModel;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] arr = { 1, 2, 3, 4, 5 };

            ReadOnlyCollection<int> roc = Array.AsReadOnly(arr);

            arr[0] = 999;

            //Error CS0200  Property or indexer 'ReadOnlyCollection<int>.this[int]' 
            //              cannot be assigned - it is read only 
            //roc[0] = 888;

            for (int i = 0; i < roc.Count; i++)
                Console.WriteLine(roc[i]);
        }
    }
}

/*
run:
   
999
2
3
4
5

*/

 

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