ListOfTConverter.cs

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using System.Collections.Generic;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class ListOfTConverter<TCollection, TElement> : IEnumerableDefaultConverter<TCollection, TElement> where TCollection : List<TElement>
{
    protected override void Add(in TElement value, ref ReadStack state)
    {
        ((TCollection)state.Current.ReturnValue).Add(value);
    }
 
    protected override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state, JsonSerializerOptions options)
    {
        if (state.Current.JsonTypeInfo.CreateObject == null)
        {
            ThrowHelper.ThrowNotSupportedException_SerializationNotSupported(state.Current.JsonTypeInfo.Type);
        }
        state.Current.ReturnValue = state.Current.JsonTypeInfo.CreateObject();
    }
 
    protected override bool OnWriteResume(Utf8JsonWriter writer, TCollection value, JsonSerializerOptions options, ref WriteStack state)
    {
        int i = state.Current.EnumeratorIndex;
        JsonConverter<TElement> elementConverter = JsonCollectionConverter<TCollection, TElement>.GetElementConverter(ref state);
        if (elementConverter.CanUseDirectReadOrWrite && !state.Current.NumberHandling.HasValue)
        {
            for (; i < value.Count; i++)
            {
                elementConverter.Write(writer, value[i], options);
            }
        }
        else
        {
            for (; i < value.Count; i++)
            {
                TElement value2 = value[i];
                if (!elementConverter.TryWrite(writer, in value2, options, ref state))
                {
                    state.Current.EnumeratorIndex = i;
                    return false;
                }
                if (ShouldFlush(writer, ref state))
                {
                    i = (state.Current.EnumeratorIndex = i + 1);
                    return false;
                }
            }
        }
        return true;
    }
}