How to Preserve Default Serialization When Using a Custom System.Text.Json JsonConverter?

Implement default serialization in custom System.Text.Json JsonConverter

When implementing a custom System.Text.Json.JsonConverter<T> to upgrade the data model, you may need to override the Write() method. However, in some cases you may want to retain the default serialization behavior. To achieve this, you can utilize the following strategies.

1. JsonConverter applied to properties

If a custom converter is applied to a property, simply calling Write() within the JsonSerializer.Serialize(writer, person, options); method will generate the default serialization.

2. Converters added to the Converters collection

In this case you can modify the Write() collection in the Converters method by:

<code class="language-csharp">public override void Write(Utf8JsonWriter writer, Person person, JsonSerializerOptions options)
{
    // 复制传入的选项并移除自定义转换器。
    var modifiedOptions = options.CopyAndRemoveConverter(typeof(PersonConverter));
    JsonSerializer.Serialize(writer, person, modifiedOptions);
}</code>

3. JsonConverter applied to custom value types or POCOs

There is currently no built-in method to generate a default serialization for this scenario.

4. Converter returned by JsonConverterFactory

To disable the use of a converter factory in a converter list, consider creating a JsonConverterFactory that returns a custom converter that skips serialization when the factory is applied.

Improved implementation

In the provided example, the improved implementation uses DefaultConverterFactory<T>. This class allows you to conveniently cache copied options in manufactured converters. The complete implementation looks like this:

<code class="language-csharp">public sealed class PersonConverter : DefaultConverterFactory<Person>
{
    // ... 原问题的现有代码 ...
}

public abstract class DefaultConverterFactory<T> : JsonConverterFactory
{
    // ... 接受的答案中的现有代码 ...
}

public static class JsonSerializerExtensions
{
    // ... 接受的答案中的现有代码 ...
}</code>

Other instructions

• Using DefaultConverterFactory to apply custom converters to custom value types or POCOs may cause a stack overflow.
• Modified code allows correct default serialization in the provided example.

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