ImmutableDictionaryOfTKeyTValueConverter.cs

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using System.Collections.Generic;
 
namespace System.Text.Json.Serialization.Converters;
 
internal class ImmutableDictionaryOfTKeyTValueConverter<TDictionary, TKey, TValue> : DictionaryDefaultConverter<TDictionary, TKey, TValue> where TDictionary : IReadOnlyDictionary<TKey, TValue>
{
    internal sealed override bool CanHaveIdMetadata => false;
 
    protected sealed override void Add(TKey key, in TValue value, JsonSerializerOptions options, ref ReadStack state)
    {
        ((Dictionary<TKey, TValue>)state.Current.ReturnValue)[key] = value;
    }
 
    protected sealed override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state)
    {
        state.Current.ReturnValue = new Dictionary<TKey, TValue>();
    }
 
    protected sealed override void ConvertCollection(ref ReadStack state, JsonSerializerOptions options)
    {
        Func<IEnumerable<KeyValuePair<TKey, TValue>>, TDictionary> func = (Func<IEnumerable<KeyValuePair<TKey, TValue>>, TDictionary>)state.Current.JsonTypeInfo.CreateObjectWithArgs;
        state.Current.ReturnValue = func((Dictionary<TKey, TValue>)state.Current.ReturnValue);
    }
}