How Can I Deserialize JSON with Unknown Fields Using JSON .NET's ExtensionDataAttribute?

Use JSON .NET’s ExtensionDataAttribute to deserialize JSON data containing known and unknown fields

When the JSON result contains known and unknown fields, and the unknown field names are unpredictable, these unknown fields need to be mapped to a dictionary for access and modification. For this we can use the JsonExtensionDataAttribute attribute in JSON .NET.

Consider the following class structure:

<code class="language-csharp">public class Product
{
    public string id { get; set; }
    public string name { get; set; }

    // 额外字段
    [JsonExtensionData]
    private IDictionary<string, JToken> _extraStuff;
}</code>

By applying JsonExtensionDataAttribute to the _extraStuff attribute we can instruct JSON .NET to map any unknown fields to this dictionary. JToken represents the raw JSON data for that specific field.

When using this class to deserialize JSON:

<code class="language-json">{
    "id": "7908",
    "name": "product name",
    "unknown_field_1": "some value",
    "unknown_field_2": "some value"
}</code>

The

dictionary in the Product_extraStuff object will be automatically populated with the following key-value pairs:

<code class="language-csharp">{
    {"unknown_field_1", "some value"},
    {"unknown_field_2", "some value"}
}</code>

This approach provides an efficient way to handle unknown fields without the need for a custom contract parser or dynamic object inheritance.

Note: The JsonExtensionDataAttribute property is available in JSON .NET v5 version 5 and above.

The above is the detailed content of How Can I Deserialize JSON with Unknown Fields Using JSON .NET's ExtensionDataAttribute?. For more information, please follow other related articles on the PHP Chinese website!