How to Leverage Default System.Text.Json Serialization within a Custom JSON Converter?

How to implement default JSON serialization in custom System.Text.Json converter?

When developing a custom JSON converter for System.Text.Json, you may encounter situations where the default serialization in the Write method is sufficient. To achieve this, several approaches can be considered.

Options to implement default serialization

Option 1: Use property-level JsonConverter

If the [JsonConverter] attribute is applied to a specific property, calling JsonSerializer.Serialize(writer, person, options); will generate a default serialization for that property.

Option 2: Copy and modify JsonSerializerOptions

In a custom converter's Write method, you can create a copy of the passed in JsonSerializerOptions, remove the custom converter from the copy's Converters list, and pass the modified options to JsonSerializer.Serialize<t>(Utf8JsonWriter, T, JsonSerializerOptions);</t>Medium. Note that this approach has limitations when working with recursive types.

Option 3: Use a custom converter factory

You can control the creation of a custom converter by defining JsonConverterFactory as the base class for a custom converter. In the factory's CreateConverter method, you can create a nested DefaultConverter that uses modified options for serialization and deserialization.

Option 4: Apply the converter factory to a property-level JsonConverter

Note: This method may cause stack overflow.

If JsonConverterFactory is applied to a custom value type or POCO, a stack overflow may occur during serialization.

Example implementation

The following modified PersonConverter demonstrates how to implement default serialization using a custom converter factory:

public sealed class PersonConverter : DefaultConverterFactory<Person>
{
    ... // 使用修改后的选项实现Read和Write方法

    public override bool CanConvert(Type typeToConvert) => typeof(Person) == typeToConvert;

    public override JsonConverter CreateConverter(Type typeToConvert, JsonSerializerOptions options)
        => new DefaultConverter(options, this);
}

In the DefaultConverterFactory base class, the CopyAndRemoveConverter extension method is used to create a modified copy of the option, excluding custom converters.

This method provides greater flexibility than using different JsonSerializerOptions for serialization and deserialization.

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