FSharpListConverter.cs

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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Text.Json.Serialization.Metadata;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class FSharpListConverter<TList, TElement> : IEnumerableDefaultConverter<TList, TElement> where TList : IEnumerable<TElement>
{
    private readonly Func<IEnumerable<TElement>, TList> _listConstructor;
 
    [RequiresUnreferencedCode("Uses Reflection to access FSharp.Core components at runtime.")]
    public FSharpListConverter()
    {
        _listConstructor = FSharpCoreReflectionProxy.Instance.CreateFSharpListConstructor<TList, TElement>();
    }
 
    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)
    {
        state.Current.ReturnValue = _listConstructor((List<TElement>)state.Current.ReturnValue);
    }
}