using System.Collections.Generic; using System.Diagnostics.CodeAnalysis; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; 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; internal override bool SupportsCreateObjectDelegate => false; internal sealed override bool IsConvertibleCollection => true; [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Uses Reflection to access FSharp.Core components at runtime.")] [System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Uses Reflection to access FSharp.Core components at runtime.")] public FSharpListConverter() { _listConstructor = FSharpCoreReflectionProxy.Instance.CreateFSharpListConstructor<TList, TElement>(); } protected override void Add([In] [System.Runtime.CompilerServices.IsReadOnly] TElement value, ref ReadStack state) { ((List<TElement>)state.Current.ReturnValue).Add(value); } protected override void CreateCollection(ref Utf8JsonReader reader, [System.Runtime.CompilerServices.ScopedRef] 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); } } }