Question

How to create a read-only IList wrapper around an array with Array.AsReadOnly() method in C#

Answer 1

using System;
using System.Collections.Generic;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            String[] arr = {"C#", "C", "C++", "PHP", "VB.NET"};

            IList<String> ilist = Array.AsReadOnly(arr);

            Console.WriteLine(ilist[0]); // C#

            try
            {
               ilist[0] = "Java"; // Error
            }
            catch (NotSupportedException e)
            {
               Console.WriteLine("{0} - {1}", e.GetType(), e.Message);
            }
        }
    }
}


/*
run:

C#
System.NotSupportedException - Collection is read-only.

*/

 

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