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How to Deserialize JSON with Unknown Fields Using JsonExtensionDataAttribute?

Linda Hamilton
Release: 2025-01-18 09:11:09
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How to Deserialize JSON with Unknown Fields Using JsonExtensionDataAttribute?

Handling JSON deserialization containing known and unknown fields

When processing JSON results, you often encounter situations where the received data contains known fields, as well as other fields that are unknown when the request is made. This can cause challenges when trying to deserialize data into structured objects.

One way to deal with this is to use a library like JSON.NET, which allows custom contract parsers. However, setting up a custom contract resolver can be complex.

Another solution is to utilize the JsonExtensionDataAttribute in JSON.NET. This property allows you to specify an extra field in the object that will contain all unknown fields from the JSON.

Here's an example of how to use this property:

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

    // 此属性将包含来自JSON的所有未知字段
    [JsonExtensionData]
    private IDictionary<string, JToken> ExtraFields { get; set; }
}</code>
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When you use this class to deserialize a JSON object, the known fields (Id and Name) are mapped to the object's properties. Unknown fields will be stored in the ExtraFields dictionary. You can then access these extra fields using standard dictionary operations, for example:

<code class="language-csharp">Console.WriteLine(product.ExtraFields["_unknown_field_name_1"]);</code>
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This approach simplifies the mapping of unknown fields by leveraging JSON.NET’s built-in capabilities. It requires JSON.NET 5 or higher.

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