DictionaryDefaultConverter.cs

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using System.Collections.Generic;
using System.Text.Json.Serialization.Metadata;
 
namespace System.Text.Json.Serialization.Converters;
 
internal abstract class DictionaryDefaultConverter<TDictionary, TKey, TValue> : JsonDictionaryConverter<TDictionary, TKey, TValue> where TDictionary : IEnumerable<KeyValuePair<TKey, TValue>>
{
    internal override bool CanHaveIdMetadata => true;
 
    protected internal override bool OnWriteResume(Utf8JsonWriter writer, TDictionary value, JsonSerializerOptions options, ref WriteStack state)
    {
        IEnumerator<KeyValuePair<TKey, TValue>> enumerator;
        if (state.Current.CollectionEnumerator == null)
        {
            enumerator = value.GetEnumerator();
            if (!enumerator.MoveNext())
            {
                enumerator.Dispose();
                return true;
            }
        }
        else
        {
            enumerator = (IEnumerator<KeyValuePair<TKey, TValue>>)state.Current.CollectionEnumerator;
        }
        JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo;
        if (_keyConverter == null)
        {
            _keyConverter = JsonDictionaryConverter<TDictionary, TKey, TValue>.GetConverter<TKey>(jsonTypeInfo.KeyTypeInfo);
        }
        if (_valueConverter == null)
        {
            _valueConverter = JsonDictionaryConverter<TDictionary, TKey, TValue>.GetConverter<TValue>(jsonTypeInfo.ElementTypeInfo);
        }
        do
        {
            if (ShouldFlush(writer, ref state))
            {
                state.Current.CollectionEnumerator = enumerator;
                return false;
            }
            if ((int)state.Current.PropertyState < 2)
            {
                state.Current.PropertyState = StackFramePropertyState.Name;
                TKey key = enumerator.Current.Key;
                _keyConverter.WriteAsPropertyNameCore(writer, key, options, state.Current.IsWritingExtensionDataProperty);
            }
            TValue value2 = enumerator.Current.Value;
            if (!_valueConverter.TryWrite(writer, in value2, options, ref state))
            {
                state.Current.CollectionEnumerator = enumerator;
                return false;
            }
            state.Current.EndDictionaryElement();
        }
        while (enumerator.MoveNext());
        enumerator.Dispose();
        return true;
    }
}