Unity Windows构建中Newtonsoft.Json反序列化仅获默认值问题

Unity编辑器中使用JsonConvert.DeserializeObject<UIContentData>(json)加载JSON数据完全正常，JSON格式也有效，但打包为Windows构建后，反序列化的数据出现空值或被填充默认值。将反序列化后的对象重新序列化，结果如下：

原始读取的JSON字符串 #

{
    "galleries": [{
        "id": "Acker",
        "title": "Auf dem Acker",
        "slides": [],
        "path": "/ChangeableContentData/Auf dem Acker",
        "showAllInFolder": true,
        "foldersRecursive": false,
        "enableSlideshow": false,
        "slideshowSlideDuration": 5.0
    }],
    "cardMenus": [],
    "urls": []
}

反序列化后重新序列化的结果 #

{
    "galleries": [{
        "id": null,
        "title": "",
        "slides": null,
        "path": "",
        "showAllInFolder": true,
        "foldersRecursive": true,
        "enableSlideshow": false,
        "slideshowSlideDuration": 5.0
    }],
    "cardMenus": []
}

相关C#数据类 #

[System.Serializable]
[Preserve]
public partial class UIContentData
{
    [JsonProperty("galleries")]
    public List<UIContentGalleryData> galleries { get; set; }
    [JsonProperty("cardMenus")]
    public List<UIContentCardMenuData> cardMenus { get; set; }
    [JsonProperty("urls")]
    public List<UIContentUrlData> urls { get; set; }

    public UIContentData() { }
}

[System.Serializable]
[Preserve]
public partial class UIContentGalleryData
{
    public string id { get; set; }
    [JsonProperty("title")]
    public string title { get; set; } = ""; // optional
    [JsonProperty("slides")]
    public List<UIContentGallerySlide> slides { get; set; }
    [JsonProperty("path")]
    public string baseFolderPath { get; set; } = "";
    [JsonProperty("showAllInFolder")]
    public bool showAllInFolder { get; set; } = true; // optional
    [JsonProperty("foldersRecursive")]
    public bool foldersRecursive { get; set; } = true; // optional
    [JsonProperty("enableSlideshow")]
    public bool enableSlideshow { get; set; } = false; // optional
    [JsonProperty("slideshowSlideDuration")]
    public float slideshowSlideDuration { get; set; } = 5f; // optional

    public UIContentGalleryData() { }
}

解决方案 #

• 给UIContentGalleryData的id字段添加[JsonProperty("id")]特性，明确JSON字段与类属性的映射关系：

  [JsonProperty("id")]
  public string id { get; set; }
  

• 检查Unity的IL2CPP代码裁剪设置：在Player Settings > Other Settings > Configuration中，将Managed Stripping Level调整为Medium或Low（若当前为High），避免Newtonsoft.Json反射所需的类成员被裁剪。
• 添加链接器配置文件（link.xml），确保自定义数据类和Newtonsoft.Json相关类型不被裁剪。文件内容示例：

  <linker>
    <assembly fullname="Newtonsoft.Json" preserve="all"/>
    <assembly fullname="[你的程序集名称]">
      <type fullname="UIContentData" preserve="all"/>
      <type fullname="UIContentGalleryData" preserve="all"/>
      <type fullname="UIContentGallerySlide" preserve="all"/>
      <type fullname="UIContentCardMenuData" preserve="all"/>
      <type fullname="UIContentUrlData" preserve="all"/>
    </assembly>
  </linker>
  

• 确保UIContentGallerySlide类也添加了[System.Serializable]和[Preserve]特性，否则反序列化空数组时无法正确初始化列表。

内容的提问来源于stack exchange，提问作者firala