EnumeratorViewOfEnumVariant.cs

Go to the documentation of this file.

using System.Collections;
using System.Runtime.InteropServices.ComTypes;
 
namespace System.Runtime.InteropServices.CustomMarshalers;
 
internal sealed class EnumeratorViewOfEnumVariant : ICustomAdapter, System.Collections.IEnumerator
{
    private readonly IEnumVARIANT _enumVariantObject;
 
    private bool _fetchedLastObject;
 
    private readonly object[] _nextArray = new object[1];
 
    private object _current;
 
    public object Current => _current;
 
    public EnumeratorViewOfEnumVariant(IEnumVARIANT enumVariantObject)
    {
        _enumVariantObject = enumVariantObject;
        _fetchedLastObject = false;
        _current = null;
    }
 
    public unsafe bool MoveNext()
    {
        if (_fetchedLastObject)
        {
            _current = null;
            return false;
        }
        int num = 0;
        if (_enumVariantObject.Next(1, _nextArray, (IntPtr)(&num)) == 1)
        {
            _fetchedLastObject = true;
            if (num == 0)
            {
                _current = null;
                return false;
            }
        }
        _current = _nextArray[0];
        return true;
    }
 
    public void Reset()
    {
        int num = _enumVariantObject.Reset();
        if (num < 0)
        {
            Marshal.ThrowExceptionForHR(num);
        }
        _fetchedLastObject = false;
        _current = null;
    }
 
    public object GetUnderlyingObject()
    {
        return _enumVariantObject;
    }
}