How Can I Flatten Dictionaries in JSON Serialization Using Json.Net?

Using Json.Net to flatten dictionaries in JSON serialization

In object serialization, it is sometimes necessary to flatten the dictionary into the JSON representation of the parent object. In Json.Net, a class containing a dictionary illustrates this well:

<code>public class Test
{
    public string X { get; set; }

    public Dictionary<string, string> Y { get; set; }
}</code>

The goal is to serialize the object into the following JSON:

<code>{
    "X" : "value",
    "key1": "value1",
    "key2": "value2"
}</code>

In Json.Net 5.0.5 and above, this can be achieved by using the [JsonExtensionData] attribute on the dictionary attribute:

<code>public class Test
{
    public string X { get; set; }

    [JsonExtensionData]
    public Dictionary<string, object> Y { get; set; }
}</code>

With this change, the dictionary's keys and values ​​will be serialized as part of the parent object. This functionality is bidirectional; any JSON properties that do not match class members will be stored in the dictionary during deserialization. This approach simplifies the serialization and deserialization of objects containing nested dictionaries.

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