在 C# 中使用 JSON.NET 反序列化 twitter JSON 以获取主题标签

Question

也许我在重复这个问题，但我是第一次尝试这个问题，但我找不到与我的情况完全一样的东西。

我正在用 C# 编码并使用 JSON.NET 反序列化一个json。 json 文件来自 twitter 作为对此 GET 请求的响应：
https://api.twitter.com/1/statuses/home_timeline.json?include_entities=true

json 是来自给定用户的 twitter 时间线的 20 条最新推文（json 对象）的列表，格式为单个 json 对象是这样的：

{
"created_at": "Thu Sep 20 10:25:39 +0000 2012",
"id": 248729631476314100,
"id_str": "248729631476314112",
"text": "Ask the experts and learn what's new with v.2.2 at  at #MongoDBPune (http://t.co/o5BA7zd6) and #MongoDBBangalore (http://t.co/7q3E2MBq)",
"source": "<a href=\"http://www.socialrithmic.com\" rel=\"nofollow\">Socialrithmic</a>",
"truncated": false,
"in_reply_to_status_id": null,
"in_reply_to_status_id_str": null,
"in_reply_to_user_id": null,
"in_reply_to_user_id_str": null,
"in_reply_to_screen_name": null,
"user": {
  "id": 18080585,
  "id_str": "18080585",
  "name": "mongodb",
  "screen_name": "MongoDB",
  "location": "",
  "url": "http://mongodb.org/",
  "description": "High-performance, open source, schema-free document-oriented  database   | www.facebook.com/MongoDB",
  "protected": false,
  "followers_count": 24999,
  "friends_count": 16,
  "listed_count": 1582,
  "created_at": "Fri Dec 12 17:21:18 +0000 2008",
  "favourites_count": 6,
  "utc_offset": -18000,
  "time_zone": "Eastern Time (US & Canada)",
  "geo_enabled": true,
  "verified": false,
  "statuses_count": 1669,
  "lang": "en",
  "contributors_enabled": false,
  "is_translator": false,
  "profile_background_color": "529747",
  "profile_background_image_url": "http://a0.twimg.com/profile_background_images/619655093/767dji3m3k684nza7w9z.png",
  "profile_background_image_url_https": "https://si0.twimg.com/profile_background_images/619655093/767dji3m3k684nza7w9z.png",
  "profile_background_tile": false,
  "profile_image_url": "http://a0.twimg.com/profile_images/2452709870/wo2h8r0qy8d5lsxe5lgd_normal.png",
  "profile_image_url_https": "https://si0.twimg.com/profile_images/2452709870/wo2h8r0qy8d5lsxe5lgd_normal.png",
  "profile_link_color": "43B02A",
  "profile_sidebar_border_color": "829D5E",
  "profile_sidebar_fill_color": "99CC33",
  "profile_text_color": "3E4415",
  "profile_use_background_image": true,
  "default_profile": false,
  "default_profile_image": false,
  "following": true,
  "follow_request_sent": null,
  "notifications": null
},
"geo": null,
"coordinates": null,
"place": null,
"contributors": null,
"retweet_count": 1,
"entities": {
  "hashtags": [
    {
      "text": "MongoDBPune",
      "indices": [
        55,
        67
      ]
    },
    {
      "text": "MongoDBBangalore",
      "indices": [
        95,
        112
      ]
    }
  ],
  "urls": [
    {
      "url": "http://t.co/o5BA7zd6",
      "expanded_url": "http://soc.ai/ZV",
      "display_url": "soc.ai/ZV",
      "indices": [
        69,
        89
      ]
    },
    {
      "url": "http://t.co/7q3E2MBq",
      "expanded_url": "http://soc.ai/ZW",
      "display_url": "soc.ai/ZW",
      "indices": [
        114,
        134
      ]
    }
  ],
  "user_mentions": []
},
"favorited": false,
"retweeted": false,
"possibly_sensitive": false

}

我使用此代码获取（反序列化的）列表：

List<JsonObject> list = Newtonsoft.Json.JsonConvert.DeserializeObject<List<JsonObject>>(response);

'response' 保存我的 json。当我插入断点并观察 'list' 中的 json 对象时，我发现：

{ "created_at": "2012 年 9 月 20 日星期四 10:25:39 +0000", “身份证”：248729631476314100， “id_str”：“248729631476314112”， "text": "在 #MongoDBPune (http://t.co/o5BA7zd6) 和 #MongoDBBangalore (http://t.co/7q3E2MBq) 上询问专家并了解 v.2.2 的新功能", “来源”：“社会算术”， “截断”：错误， “in_reply_to_status_id”：空， “in_reply_to_status_id_str”：空， “in_reply_to_user_id”：空， “in_reply_to_user_id_str”：空， “in_reply_to_screen_name”：空， “用户”：[ [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ], [ [] ] ], “地理”：空， “坐标”：空， “地方”：空， “贡献者”：空， “转推数”：1， “实体”：[ [ [ [ [ [] ], [ [ [], [] ] ] ], [ [ [] ], [ [ [], [] ] ] ] ] ], [ [ [ [ [] ], [ [] ], [ [] ], [ [ [], [] ] ] ], [ [ [] ], [ [] ], [ [] ], [ [ [], [] ] ] ] ] ], [ [] ] ], “最喜欢”：错误， “转推”：假的， “可能敏感”：假 }

我打算从所有 20 个 json 对象中收集所有主题标签。所以基本上我需要 在内部导航 实体以将主题标签转换为文本。但如上所示，反序列化只是部分的。它不会反序列化任何嵌套的东西。

我该如何解决这个问题？请帮忙！

Answer 1

天哪！从this stackoverflow question 得到它。谢谢@chill182！

以下是你的做法：

 ArrayList hashtags = new ArrayList();

            JArray jsonDat = JArray.Parse(response); 
            for(int x = 0; x < jsonDat.Count(); x++) 
            {
                JObject entity = JObject.Parse(jsonDat[x]["entities"].ToString());
                JArray arrHashtags = JArray.Parse(entity["hashtags"].ToString());
                for(int i=0; i < arrHashtags.Count(); i++)
                {
                    JObject hashtagstuff = JObject.Parse(arrHashtags[i].ToString());
                    hashtags.Add(hashtagstuff["text"].ToString());
                }
            }

不要忘记在命名空间中包含 Linq :)

using Newtonsoft.Json.Linq;