IEnumerableDefaultConverter.cs

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using System.Collections.Generic;
 
namespace System.Text.Json.Serialization.Converters;
 
internal abstract class IEnumerableDefaultConverter<TCollection, TElement> : JsonCollectionConverter<TCollection, TElement> where TCollection : IEnumerable<TElement>
{
    internal override bool CanHaveIdMetadata => true;
 
    protected override bool OnWriteResume(Utf8JsonWriter writer, TCollection value, JsonSerializerOptions options, ref WriteStack state)
    {
        IEnumerator<TElement> enumerator;
        if (state.Current.CollectionEnumerator == null)
        {
            enumerator = value.GetEnumerator();
            if (!enumerator.MoveNext())
            {
                enumerator.Dispose();
                return true;
            }
        }
        else
        {
            enumerator = (IEnumerator<TElement>)state.Current.CollectionEnumerator;
        }
        JsonConverter<TElement> elementConverter = JsonCollectionConverter<TCollection, TElement>.GetElementConverter(ref state);
        do
        {
            if (ShouldFlush(writer, ref state))
            {
                state.Current.CollectionEnumerator = enumerator;
                return false;
            }
            TElement value2 = enumerator.Current;
            if (!elementConverter.TryWrite(writer, in value2, options, ref state))
            {
                state.Current.CollectionEnumerator = enumerator;
                return false;
            }
        }
        while (enumerator.MoveNext());
        enumerator.Dispose();
        return true;
    }
}