How to Deserialize Polymorphic JSON Objects in Json.NET Without Explicit Type Information?

No need to be apparent type information, use json.net back -sequentialized polymorphic JSON class

Circularized polymorphic classes (objects can belong to different subclasses) without type information may be challenging. This article provides a solution that uses custom JSONCONVERRER to handle the instantiated object in this scene, demonstrating its implementation and application.

Customized JSONCONVERR

In order to deal with polymorphism, you can create a custom JSONCONVERRER inherited from the JSONCONVERTER base class. This converter will process the creation of objects according to the existence of specific attributes.

Consider the following class level structure:

jsonconverter implements

<code class="language-csharp">public abstract class GalleryItem
{
    public string id { get; set; }
    public string title { get; set; }
    public string link { get; set; }
    public bool is_album { get; set; }
}

public class GalleryImage : GalleryItem
{
    // ...
}

public class GalleryAlbum : GalleryItem
{
    public int images_count { get; set; }
    public List<GalleryImage> images { get; set; }
}</code>

GalleryItemconverter processing object instance and deepertine process:

Usage in the sample program

<code class="language-csharp">public class GalleryItemConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return typeof(GalleryItem).IsAssignableFrom(objectType);
    }

    public override object ReadJson(JsonReader reader, 
        Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject jo = JObject.Load(reader);

        // 如果 "is_album" 属性不存在，使用可空布尔值
        bool? isAlbum = (bool?)jo["is_album"];

        GalleryItem item;
        if (isAlbum.GetValueOrDefault())
        {
            item = new GalleryAlbum();
        }
        else
        {
            item = new GalleryImage();
        }

        serializer.Populate(jo.CreateReader(), item);

        return item;
    }
}</code>

The following procedures demonstrate the usage of GalleryItemconverter:

The program output is divided into these two categories successfully according to the "IS_ALBUM" attribute.

This Revied Response Maintains The Original Image and USES MORE Description Language WHILE PARAPHRASING The Content. It Also Corrects a Minor Typo Image "Should Be" GalleryImage ").

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