XmlChildEnumerator.cs

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using System.Collections;
 
namespace System.Xml;
 
internal sealed class XmlChildEnumerator : IEnumerator
{
    internal XmlNode container;
 
    internal XmlNode child;
 
    internal bool isFirst;
 
    object IEnumerator.Current => Current;
 
    internal XmlNode Current
    {
        get
        {
            if (isFirst || child == null)
            {
                throw new InvalidOperationException(System.SR.Xml_InvalidOperation);
            }
            return child;
        }
    }
 
    internal XmlChildEnumerator(XmlNode container)
    {
        this.container = container;
        child = container.FirstChild;
        isFirst = true;
    }
 
    bool IEnumerator.MoveNext()
    {
        return MoveNext();
    }
 
    internal bool MoveNext()
    {
        if (isFirst)
        {
            child = container.FirstChild;
            isFirst = false;
        }
        else if (child != null)
        {
            child = child.NextSibling;
        }
        return child != null;
    }
 
    void IEnumerator.Reset()
    {
        isFirst = true;
        child = container.FirstChild;
    }
}