System.Configuration.ConfigurationElementCollection.BaseGetKey C# (CSharp) Метод

        protected internal object BaseGetKey(int index) {
            int VirtualIndex = 0;
            Entry entry = (Entry)null;
            if (index < 0) {
                throw new ConfigurationErrorsException(SR.GetString(SR.IndexOutOfRange, index));
            }

            foreach (Entry entryfound in _items) {
                if (VirtualIndex == index && (entryfound._entryType != EntryType.Removed)) {
                    entry = entryfound;
                    break;
                }

                if (entryfound._entryType != EntryType.Removed) {
                    VirtualIndex++;
                }
            }

            // Entry entry = (Entry)_items[index];
            if (entry != null) {
                object key = entry.GetKey(this);

                return key;
            }
            else {
                throw new ConfigurationErrorsException(SR.GetString(SR.IndexOutOfRange, index));
            }
        }