FSharpMapConverter.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 FSharpMapConverter<TMap, TKey, TValue> : DictionaryDefaultConverter<TMap, TKey, TValue> where TMap : IEnumerable<KeyValuePair<TKey, TValue>>
{
    private readonly Func<IEnumerable<Tuple<TKey, TValue>>, TMap> _mapConstructor;
 
    internal override bool CanHaveIdMetadata => false;
 
    [RequiresUnreferencedCode("Uses Reflection to access FSharp.Core components at runtime.")]
    public FSharpMapConverter()
    {
        _mapConstructor = FSharpCoreReflectionProxy.Instance.CreateFSharpMapConstructor<TMap, TKey, TValue>();
    }
 
    protected override void Add(TKey key, in TValue value, JsonSerializerOptions options, ref ReadStack state)
    {
        ((List<Tuple<TKey, TValue>>)state.Current.ReturnValue).Add(new Tuple<TKey, TValue>(key, value));
    }
 
    protected override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state)
    {
        state.Current.ReturnValue = new List<Tuple<TKey, TValue>>();
    }
 
    protected override void ConvertCollection(ref ReadStack state, JsonSerializerOptions options)
    {
        state.Current.ReturnValue = _mapConstructor((List<Tuple<TKey, TValue>>)state.Current.ReturnValue);
    }
}