IReadOnlyDictionaryOfTKeyTValueConverter.cs

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using System.Collections.Generic;
 
namespace System.Text.Json.Serialization.Converters;
 
internal sealed class IReadOnlyDictionaryOfTKeyTValueConverter<TDictionary, TKey, TValue> : DictionaryDefaultConverter<TDictionary, TKey, TValue> where TDictionary : IReadOnlyDictionary<TKey, TValue>
{
    internal override Type RuntimeType => typeof(Dictionary<TKey, TValue>);
 
    protected override void Add(TKey key, in TValue value, JsonSerializerOptions options, ref ReadStack state)
    {
        ((Dictionary<TKey, TValue>)state.Current.ReturnValue)[key] = value;
    }
 
    protected override void CreateCollection(ref Utf8JsonReader reader, ref ReadStack state)
    {
        if (!TypeToConvert.IsAssignableFrom(RuntimeType))
        {
            ThrowHelper.ThrowNotSupportedException_CannotPopulateCollection(TypeToConvert, ref reader, ref state);
        }
        state.Current.ReturnValue = new Dictionary<TKey, TValue>();
    }
}