CharEnumerator.cs

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using System.Collections;
using System.Collections.Generic;
 
namespace System;
 
public sealed class CharEnumerator : IEnumerator, IEnumerator<char>, IDisposable, ICloneable
{
    private string _str;
 
    private int _index;
 
    private char _currentElement;
 
    object? IEnumerator.Current => Current;
 
    public char Current
    {
        get
        {
            if (_index == -1)
            {
                throw new InvalidOperationException(SR.InvalidOperation_EnumNotStarted);
            }
            if (_index >= _str.Length)
            {
                throw new InvalidOperationException(SR.InvalidOperation_EnumEnded);
            }
            return _currentElement;
        }
    }
 
    internal CharEnumerator(string str)
    {
        _str = str;
        _index = -1;
    }
 
    public object Clone()
    {
        return MemberwiseClone();
    }
 
    public bool MoveNext()
    {
        if (_index < _str.Length - 1)
        {
            _index++;
            _currentElement = _str[_index];
            return true;
        }
        _index = _str.Length;
        return false;
    }
 
    public void Dispose()
    {
        if (_str != null)
        {
            _index = _str.Length;
        }
        _str = null;
    }
 
    public void Reset()
    {
        _currentElement = '\0';
        _index = -1;
    }
}