Json反序列化解析无效的Json对象

Posted 2023-04-12

【中文标题】Json反序列化解析无效的Json对象

【英文标题】：Json Deserialization parsing non valid Json object

【发布时间】：2017-07-27 17:39:14

【问题描述】：

我正在尝试将从 Web API 检索到的 Json 对象反序列化为强类型对象列表，如下所示：

WebClient wc = new WebClient();

        // Downloading & Deserializing the Json file
        var jsonMain = wc.DownloadString("http://api.flexianalysis.com/services/FlexiAnalysisService.svc/FlexiAnalysisNews?key=___&catagory=Forex");


        JObject token2 = JObject.Parse(jsonMain);

        List<News> listNews = new List<News>();

        foreach (var result in token2["d"])
        
            news = new News();
            news.id = (string)result["ID"];
            news.Title = (string)result["Title"];
            news.Date = (string)result["PublishingDate"];
            news.Content = (string)result["News"];
            listNews.Add(news);
        

        return View(listNews);

问题是我总是得到 1 个字符串的结果，因为解析器没有解析一个有效的 Json 对象。 （我猜它是无效字符，无法正确解析）...

有人有什么想法吗？

【问题讨论】：

那么你想要一个 JSON 解析器来解析非 JSON 吗？

d 的内容是一个有效的 JSON。我刚刚在jsonviewer.stack.hu

中将其可视化

【参考方案1】：

你需要JArray results = JArray.Parse(token2["d"].ToString());

请尝试

WebClient wc = new WebClient();
// Downloading & Deserializing the Json file
var jsonMain = wc.DownloadString("http://api.flexianalysis.com/services/FlexiAnalysisService.svc/FlexiAnalysisNews?key=gZ_lhbJ_46ThmvEki2lF&catagory=Forex");


JObject token2 = JObject.Parse(jsonMain);
JArray results = JArray.Parse(token2["d"].ToString());

List<News> listNews = new List<News>();
foreach (var result in results)

    news = new News();
    news.id = (string)result["ID"];
    news.Title = (string)result["Title"];
    news.Date = (string)result["PublishingDate"];
    news.Content = (string)result["News"];
    listNews.Add(news);


return View(listNews);

测试：

【参考方案2】：

您也可以尝试使用Dictionary<string, IEnumerable<Dictionary<string, object>>>：

var root = JsonConvert.DeserializeObject<Dictionary<string, IEnumerable<Dictionary<string, object>>>>(jsonMain);
List<News> news = root["d"].Select(result => new News()

   id = result["ID"] as string,
   Title = result["Title"] as string,
   Date = result["PublishingDate"] as string,
   Content = result["News"] as string
).ToList();
return View(news);

【讨论】：

这行不通。您收到“附加信息：转换值时出错...”i.imgur.com/VwqrXlQ.png

【参考方案3】：

可以选择

class News


    [JsonProperty("ID")]
    public int id  get; set; 

    [JsonProperty("Title")]
    public string Title  get; set; 

    [JsonProperty("PublishingDate")]
    public DateTime Date  get; set; 

    [JsonProperty("News")]
    public string Content  get; set; 

WebClient 实现了 IDisposible 接口。在using statement 中使用它还不错。

        using (WebClient wc = new WebClient())
        
            var jsonMain = wc.DownloadString("http://api.flexianalysis.com/services/FlexiAnalysisService.svc/FlexiAnalysisNews?key=gZ_lhbJ_46ThmvEki2lF&catagory=Forex");
            JObject token2 = JObject.Parse(jsonMain);
            string s = token2["d"].ToString();
            List<News> list = JArray.Parse(s).ToObject<List<News>>();