OidCollection.cs

using System.Collections;
using System.Security.Cryptography.X509Certificates;

namespace System.Security.Cryptography
{
    public sealed class OidCollection : ICollection, IEnumerable
    {
        private ArrayList m_list;

        public Oid this[int index]
        {
            get
            {
                return m_list[index] as Oid;
            }
        }

        public Oid this[string oid]
        {
            get
            {
                string text = System.Security.Cryptography.X509Certificates.X509Utils.FindOidInfoWithFallback(2u, oid, OidGroup.All);
                if (text == null)
                {
                    text = oid;
                }
                foreach (Oid item in m_list)
                {
                    if (item.Value == text)
                    {
                        return item;
                    }
                }
                return null;
            }
        }

        public int Count => m_list.Count;

        public bool IsSynchronized => false;

        public object SyncRoot => this;

        public OidCollection()
        {
            m_list = new ArrayList();
        }

        public int Add(Oid oid)
        {
            return m_list.Add(oid);
        }

        public OidEnumerator GetEnumerator()
        {
            return new OidEnumerator(this);
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return new OidEnumerator(this);
        }

        void ICollection.CopyTo(Array array, int index)
        {
            if (array == null)
            {
                throw new ArgumentNullException("array");
            }
            if (array.Rank != 1)
            {
                throw new ArgumentException(SR.GetString("Arg_RankMultiDimNotSupported"));
            }
            if (index < 0 || index >= array.Length)
            {
                throw new ArgumentOutOfRangeException("index", SR.GetString("ArgumentOutOfRange_Index"));
            }
            if (index + Count > array.Length)
            {
                throw new ArgumentException(SR.GetString("Argument_InvalidOffLen"));
            }
            for (int i = 0; i < Count; i++)
            {
                array.SetValue(this[i], index);
                index++;
            }
        }

        public void CopyTo(Oid[] array, int index)
        {
            ((ICollection)this).CopyTo((Array)array, index);
        }
    }
}