System.Security.Cryptography.X509Certificates.X509ChainElementCollection.this C# (CSharp) Метод

        public X509ChainElement this[int index]
        {
            get
            {
                if (index < 0)
                    throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
                if (index >= _elements.Length)
                    throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);

                return _elements[index];
            }
        }