using System.Collections.Generic; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Text.Json.Serialization.Metadata; namespace System.Text.Json.Serialization.Converters { internal sealed class IDictionaryOfTKeyTValueConverter<TDictionary, TKey, TValue> : DictionaryDefaultConverter<TDictionary, TKey, TValue> where TDictionary : IDictionary<TKey, TValue> { internal override bool CanPopulate => true; protected override void Add(TKey key, [In] [System.Runtime.CompilerServices.IsReadOnly] TValue value, JsonSerializerOptions options, ref ReadStack state) { TDictionary val = (TDictionary)state.Current.ReturnValue; if (options.AllowDuplicateProperties) val[key] = value; else if (!JsonHelpers.TryAdd<TKey, TValue>((IDictionary<TKey, TValue>)(object)val, key, value)) { ThrowHelper.ThrowJsonException_DuplicatePropertyNotAllowed(); } if (base.IsValueType) state.Current.ReturnValue = val; } protected override void CreateCollection(ref Utf8JsonReader reader, [System.Runtime.CompilerServices.ScopedRef] ref ReadStack state) { base.CreateCollection(ref reader, ref state); if (((TDictionary)state.Current.ReturnValue).IsReadOnly) { state.Current.ReturnValue = null; ThrowHelper.ThrowNotSupportedException_CannotPopulateCollection(Type, ref reader, ref state); } } internal override void ConfigureJsonTypeInfo(JsonTypeInfo jsonTypeInfo, JsonSerializerOptions options) { if (jsonTypeInfo.CreateObject == null && Type.IsAssignableFrom(typeof(Dictionary<TKey, TValue>))) jsonTypeInfo.CreateObject = (() => new Dictionary<TKey, TValue>()); } } }