IListEnumerator.cs

Go to the documentation of this file.

using System.Collections;
using System.Collections.Generic;
 
namespace System.Xml.Xsl;
 
internal struct IListEnumerator<T> : IEnumerator<T>, IEnumerator, IDisposable
{
    private readonly IList<T> _sequence;
 
    private int _index;
 
    private T _current;
 
    public T Current => _current;
 
    object IEnumerator.Current
    {
        get
        {
            if (_index == 0)
            {
                throw new InvalidOperationException(System.SR.Format(System.SR.Sch_EnumNotStarted, string.Empty));
            }
            if (_index > _sequence.Count)
            {
                throw new InvalidOperationException(System.SR.Format(System.SR.Sch_EnumFinished, string.Empty));
            }
            return _current;
        }
    }
 
    public IListEnumerator(IList<T> sequence)
    {
        _sequence = sequence;
        _index = 0;
        _current = default(T);
    }
 
    public void Dispose()
    {
    }
 
    public bool MoveNext()
    {
        if (_index < _sequence.Count)
        {
            _current = _sequence[_index];
            _index++;
            return true;
        }
        _current = default(T);
        return false;
    }
 
    void IEnumerator.Reset()
    {
        _index = 0;
        _current = default(T);
    }
}