using System.Collections.Generic; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; namespace System.Text.Json.Serialization.Converters { internal sealed class IReadOnlyDictionaryOfTKeyTValueConverter<TDictionary, TKey, TValue> : DictionaryDefaultConverter<TDictionary, TKey, TValue> where TDictionary : IReadOnlyDictionary<TKey, TValue> { private readonly bool _isDeserializable = typeof(TDictionary).IsAssignableFrom(typeof(Dictionary<TKey, TValue>)); internal override bool SupportsCreateObjectDelegate => false; protected override void Add(TKey key, [In] [System.Runtime.CompilerServices.IsReadOnly] TValue value, JsonSerializerOptions options, ref ReadStack state) { ((Dictionary<TKey, TValue>)state.Current.ReturnValue)[key] = value; } protected override void CreateCollection(ref Utf8JsonReader reader, [System.Runtime.CompilerServices.ScopedRef] ref ReadStack state) { if (!_isDeserializable) ThrowHelper.ThrowNotSupportedException_CannotPopulateCollection(Type, ref reader, ref state); state.Current.ReturnValue = new Dictionary<TKey, TValue>(); } } }