ArrayConverter.cs

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using System.Collections.Generic;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class ArrayConverter<TCollection, TElement> : IEnumerableDefaultConverter<TElement[], TElement>
{
    internal override bool CanHaveIdMetadata => false;
 
    protected override void Add(in TElement value, ref ReadStack state)
    {
        ((List<TElement>)state.Current.ReturnValue).Add(value);
    }
 
    protected override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state, JsonSerializerOptions options)
    {
        state.Current.ReturnValue = new List<TElement>();
    }
 
    protected override void ConvertCollection(ref ReadStack state, JsonSerializerOptions options)
    {
        List<TElement> list = (List<TElement>)state.Current.ReturnValue;
        state.Current.ReturnValue = list.ToArray();
    }
 
    protected override bool OnWriteResume(Utf8JsonWriter writer, TElement[] array, JsonSerializerOptions options, ref WriteStack state)
    {
        int i = state.Current.EnumeratorIndex;
        JsonConverter<TElement> elementConverter = JsonCollectionConverter<TElement[], TElement>.GetElementConverter(ref state);
        if (elementConverter.CanUseDirectReadOrWrite && !state.Current.NumberHandling.HasValue)
        {
            for (; i < array.Length; i++)
            {
                elementConverter.Write(writer, array[i], options);
            }
        }
        else
        {
            for (; i < array.Length; i++)
            {
                TElement value = array[i];
                if (!elementConverter.TryWrite(writer, in value, options, ref state))
                {
                    state.Current.EnumeratorIndex = i;
                    return false;
                }
                if (ShouldFlush(writer, ref state))
                {
                    i = (state.Current.EnumeratorIndex = i + 1);
                    return false;
                }
            }
        }
        return true;
    }
}