JSON字符串序列化(Newtonsoft.JSON)

本文关键字:JSON Newtonsoft 序列化 字符串 | 更新日期: 2023-09-27 18:30:06

我得到一个JSON字符串作为HTTP响应。这个字符串看起来像:

response: {
    count: 524,
    items: [{
        id: 318936948,
        owner_id: 34,
        artist: 'The Smiths',
        title: 'How Soon Is Now',
        duration: 233,
        url: 'link',
        genre_id: 9
    }, {
        id: 312975563,
        owner_id: 34,
        artist: 'Thom Yorke',
        title: 'Guess Again!',
        duration: 263,
        url: 'link',
        genre_id: 22
    }]
}

我有Newtonsoft.Json库,以及类Response和Item:

[JsonObject(MemberSerialization.OptIn)]
class Response
{
    [JsonProperty("count")]
    public int count { get; set; }
    [JsonProperty("items")]
    public List<Item> items { get; set; }
}
[JsonObject(MemberSerialization.OptOut)]
class Item
{
    public string aid { get; set; }
    public string owner_id { get; set; }
    public string artist { get; set; }
    public string title { get; set; }
    public string duration { get; set; }
    public string url { get; set; }
    public int lyrics_id { get; set; }
    public int album_id { get; set; }
    public int genre_id { get; set; }
}

我这样反序列化它:

Response r = JsonConvert.DeserializeObject<Response>(line);

它不起作用,"r"保持为空。我哪里错了,为什么?它正在编译,没有任何例外。

JSON字符串序列化(Newtonsoft.JSON)

这里有几个问题:

  1. 您的JSON字符串缺少外括号。它应该看起来像

    { response: {
        count: 524,
        items: [{
            id: 318936948,
            owner_id: 34,
            artist: 'The Smiths',
            title: 'How Soon Is Now',
            duration: 233,
            url: 'link',
            genre_id: 9
        }, {
            id: 312975563,
            owner_id: 34,
            artist: 'Thom Yorke',
            title: 'Guess Again!',
            duration: 263,
            url: 'link',
            genre_id: 22
        }]
    }}
    
  2. 您正在尝试反序列化Response类,但该类中没有字段response,它显然是某个包含类中的字段。因此,您需要提取出实际的Response

  3. Item中的属性aid需要命名为id

因此,以下内容似乎有效:

            // Fix missing outer parenthesis
            var fixedLine = "{" + line + "}";
            // Parse into a JObject
            var mapping = JObject.Parse(fixedLine);
            // Extract the "response" and deserialize it.
            Response r = mapping["response"].ToObject<Response>();
            Debug.WriteLine(r.count);
            foreach (var item in r.items)
            {
                Debug.WriteLine("  " + JsonConvert.SerializeObject(item));
            }

这会产生调试输出

524
  {"id":"318936948","owner_id":"34","artist":"The Smiths","title":"How Soon Is Now","duration":"233","url":"link","lyrics_id":0,"album_id":0,"genre_id":9}
  {"id":"312975563","owner_id":"34","artist":"Thom Yorke","title":"Guess Again!","duration":"263","url":"link","lyrics_id":0,"album_id":0,"genre_id":22}

并显示数据已成功反序列化。

您的代码对我来说是按原样工作的。您收到的JSON字符串开头是否包含response:位?如果是这样,您需要去掉它(删除第一个{字符之前字符串中的所有内容),那么它应该对您有效。