using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
namespace ConsoleApplication_C_Sharp
{
class Program
{
static void Main(string[] args)
{
List<int> list = new List<int>();
list.Add(1);
list.Add(2);
list.Add(3);
list.Add(4);
list.Add(5);
ReadOnlyCollection<int> roc = new ReadOnlyCollection<int>(list);
foreach (int n in roc)
Console.WriteLine("roc: {0}", n);
Console.WriteLine();
//Error CS1061 'ReadOnlyCollection<int>' does not contain a definition for 'Add'
//roc.Add(6);
int[] arr = new int[6];
roc.CopyTo(arr, 0);
foreach (int n in arr)
Console.WriteLine("arr: {0}", n);
Console.WriteLine();
Console.WriteLine(roc.Count);
Console.WriteLine(roc.IndexOf(2));
Console.WriteLine(roc.Contains(999));
}
}
}
/*
run:
roc: 1
roc: 2
roc: 3
roc: 4
roc: 5
arr: 1
arr: 2
arr: 3
arr: 4
arr: 5
5
1
False
*/
