How Can I Include Dictionary Properties in Parent Object Serialization with Json.Net?

Extend parent object serialization using Json.Net to include dictionary attributes

When object serialization involves complex data structures such as dictionaries, it may be necessary to include these properties in the JSON representation of the parent object.

For example, a class containing a dictionary:

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

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

The expected JSON output is:

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

where the dictionary keys are included as part of the parent object.

For Json.Net 5.0.5 and above, a simple solution is to use the [JsonExtensionData] attribute:

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

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

When a dictionary is marked with this attribute, its keys and values ​​will be included in the JSON representation of the parent object during serialization. This approach also extends to deserialization, where unmatched JSON attributes will be stored in a dictionary.

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