How Can I Serialize Private Fields and Deeply Nested Objects in JSON.Net?

Use custom ContractResolver to solve the problem of private fields and subclasses in JSON serialization

When performing regular backup or temporary debugging, you need to serialize private fields and deeply nested fields in the class. In this case, you can use JSON.Net's custom ContractResolver.

By implementing a custom ContractResolver, you can control the serialization process and flexibly handle public and private fields. The key is to override the CreateProperties method in the ContractResolver class.

Modify this method to use BindingFlags to collect properties and fields, scanning all visibility levels: public, non-public and instance level. This comprehensive approach ensures that all relevant fields are captured.

Remember to unlock read and write access for each property after you define it. You can grant access to these properties during serialization by overriding their Visibility property.

The following is an example of a custom ContractResolver:

<code class="language-csharp">public class MyContractResolver : Newtonsoft.Json.Serialization.DefaultContractResolver
{
    protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
    {
        var props = type.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
                        .Select(p => base.CreateProperty(p, memberSerialization))
                    .Union(type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
                               .Select(f => base.CreateProperty(f, memberSerialization)))
                    .ToList();
        props.ForEach(p => { p.Writable = true; p.Readable = true; });
        return props;
    }
}</code>

In practice, instantiate a custom ContractResolver and pass it to the JSON.Net serializer like this:

<code class="language-csharp">var settings = new JsonSerializerSettings() { ContractResolver = new MyContractResolver() };
var json = JsonConvert.SerializeObject(obj, settings);</code>

This approach effectively forces JSON.Net to serialize private fields and deeply nested objects, thus providing a complete backup of the object graph.

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