


Default serialization override in custom JsonConverter
Question
How to retain the default serialization behavior in a custom System.Text.Json.JsonConverter without custom writing logic?
Description
JsonConverter choices have different priorities, including:
- Attribute level features
- Converters added to the Converters collection
- Attributes that apply to custom value types or POCOs
- The converter returned by the converter factory
Solution
There are different ways to implement default serialization depending on how the converter is applied:
Attribute Level Features
Call JsonSerializer.Serialize(writer, person, options); will generate default serialization.
Converters in the Converters collection
- Copies the passed options, removing the converter from the copy's Converters list.
- Pass modified options to JsonSerializer.Serialize
(Utf8JsonWriter, T, JsonSerializerOptions); - Note: This method may not be thread-safe and may cause problems with recursive types.
Custom value type or POCO
- Currently, generating default serialization for converters applied to custom value types or POCOs is not supported.
Converter Factory
- Use DefaultConverterFactory
to create a converter that generates default serialization. - Cache modified options in manufactured converters that do not contain converters.
Example
Here is an example using a converter factory:
public sealed class PersonConverter : DefaultConverterFactory<Person> { ... protected override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions modifiedOptions) => (T)JsonSerializer.Deserialize(ref reader, typeToConvert, modifiedOptions); protected override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions modifiedOptions) => JsonSerializer.Serialize(writer, value, modifiedOptions); } ... var person = new Person("John", "Doe"); var options = new JsonSerializerOptions { Converters = { new PersonConverter() } }; var json = JsonSerializer.Serialize(person, options);
Important Note
- Applying DefaultConverterFactory
directly to a custom value type or POCO will cause a stack overflow. - Using JsonSerializer.Serialize(writer, person, options); will result in default serialization when applying a converter to property-level properties.
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