ObjectConverter.cs

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namespace System.Text.Json.Serialization.Converters;
 
internal sealed class ObjectConverter : JsonConverter<object>
{
    public ObjectConverter()
    {
        IsInternalConverterForNumberType = true;
    }
 
    public override object Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        if (options.UnknownTypeHandling == JsonUnknownTypeHandling.JsonElement)
        {
            return JsonElement.ParseValue(ref reader);
        }
        return JsonNodeConverter.Instance.Read(ref reader, typeToConvert, options);
    }
 
    public override void Write(Utf8JsonWriter writer, object value, JsonSerializerOptions options)
    {
        writer.WriteStartObject();
        writer.WriteEndObject();
    }
 
    internal override object ReadAsPropertyNameCore(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        ThrowHelper.ThrowNotSupportedException_DictionaryKeyTypeNotSupported(TypeToConvert, this);
        return null;
    }
 
    internal override void WriteAsPropertyNameCore(Utf8JsonWriter writer, object value, JsonSerializerOptions options, bool isWritingExtensionDataProperty)
    {
        Type type = value.GetType();
        JsonConverter converterInternal = options.GetConverterInternal(type);
        if (converterInternal == this)
        {
            ThrowHelper.ThrowNotSupportedException_DictionaryKeyTypeNotSupported(type, this);
        }
        converterInternal.WriteAsPropertyNameCoreAsObject(writer, value, options, isWritingExtensionDataProperty);
    }
 
    internal override object ReadNumberWithCustomHandling(ref Utf8JsonReader reader, JsonNumberHandling handling, JsonSerializerOptions options)
    {
        if (options.UnknownTypeHandling == JsonUnknownTypeHandling.JsonElement)
        {
            return JsonElement.ParseValue(ref reader);
        }
        return JsonNodeConverter.Instance.Read(ref reader, typeof(object), options);
    }
}