ResourceFallbackManager.cs

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using System.Collections;
using System.Collections.Generic;
using System.Globalization;
 
namespace System.Resources;
 
internal sealed class ResourceFallbackManager : IEnumerable<CultureInfo>, IEnumerable
{
    private readonly CultureInfo m_startingCulture;
 
    private readonly CultureInfo m_neutralResourcesCulture;
 
    private readonly bool m_useParents;
 
    internal ResourceFallbackManager(CultureInfo startingCulture, CultureInfo neutralResourcesCulture, bool useParents)
    {
        if (startingCulture != null)
        {
            m_startingCulture = startingCulture;
        }
        else
        {
            m_startingCulture = CultureInfo.CurrentUICulture;
        }
        m_neutralResourcesCulture = neutralResourcesCulture;
        m_useParents = useParents;
    }
 
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
 
    public IEnumerator<CultureInfo> GetEnumerator()
    {
        bool reachedNeutralResourcesCulture = false;
        CultureInfo currentCulture = m_startingCulture;
        do
        {
            if (m_neutralResourcesCulture != null && currentCulture.Name == m_neutralResourcesCulture.Name)
            {
                yield return CultureInfo.InvariantCulture;
                reachedNeutralResourcesCulture = true;
                break;
            }
            yield return currentCulture;
            currentCulture = currentCulture.Parent;
        }
        while (m_useParents && !currentCulture.HasInvariantCultureName);
        if (m_useParents && !m_startingCulture.HasInvariantCultureName && !reachedNeutralResourcesCulture)
        {
            yield return CultureInfo.InvariantCulture;
        }
    }
}