How Can I Deserialize JSON with Both Known and Unknown Fields in C#?

JSON deserialization of known and unknown fields in C#

When the JSON result contains known and unknown fields, it is usually necessary to map the unknown fields into a dictionary for easy access and modification. While there are multiple ways to achieve this, using JsonExtensionDataAttribute in JSON .NET provides a convenient solution.

The

JsonExtensionDataAttribute attribute allows you to specify an attribute to hold additional unknown fields. An example is as follows:

public class Product
{
    public string id { get; set; }
    public string name { get; set; }

    [JsonExtensionData]
    private IDictionary<string, JToken> _extraFields;
}

Using this attribute, unknown fields will be stored in the _extraFields attribute, which is a dictionary of string keys (field names) and JToken values ​​(field values). This allows you to easily access and modify unknown fields in your code.

Please note that this method requires JSON .NET v5 version 5 or higher. If you are using an earlier version, you may want to explore other options mentioned in the original article, such as using a custom contract parser or a custom converter.

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