在所述字符串中的文本之间获取字符串中的文本

Question

假设我有一个看起来像这样的字符串

{
  "_links": {
    "next": "https://api.twitch.tv/kraken/users/test_user1/follows/channels?direction=DESC&limit=25&offset=25",
    "self": "https://api.twitch.tv/kraken/users/test_user1/follows/channels?direction=DESC&limit=25&offset=0"
  },
  "follows": [
    {
      "created_at": "2013-06-02T09:38:45Z",
      "_links": {
        "self": "https://api.twitch.tv/kraken/users/test_user1/follows/channels/test_channel"
      },
      "channel": {
        "banner": null,
        "_id": 1,
        "url": "http://www.twitch.tv/test_channel",
        "mature": null,
        "teams": [

        ],
        "status": null,
        "logo": null,
        "name": "test_channel",
        "video_banner": null,
        "display_name": "test_channel",
        "created_at": "2007-05-22T10:37:47Z",
        "delay": 0,
        "game": null,
        "_links": {
          "stream_key": "https://api.twitch.tv/kraken/channels/test_channel/stream_key",
          "self": "https://api.twitch.tv/kraken/channels/test_channel",
          "videos": "https://api.twitch.tv/kraken/channels/test_channel/videos",
          "commercial": "https://api.twitch.tv/kraken/channels/test_channel/commercial",
          "chat": "https://api.twitch.tv/kraken/chat/test_channel",
          "features": "https://api.twitch.tv/kraken/channels/test_channel/features"
        },
        "updated_at": "2008-02-12T06:04:29Z",
        "background": null
      }
    },
    ...
  ]
}

频道中的部分将出现 x 次，其中“名称”部分具有不同的值。我将如何使用正则表达式或不获取上面代码中值为“test_channel”的“名称”中的值。它出现的所有时间，然后将其打印到文本框

我认为我管理的唯一部分是正则表达式部分

string regex = @"(""name"":)\s+(\w+)(,""video_banner"")";

Answer 1

使用Json.Net 和this site

var obj = JsonConvert.DeserializeObject<Krysvac.RootObject>(yourJsonString);
foreach(var item in obj.follows)
{
    Console.WriteLine(item.channel.name);
}

---

public class Krysvac
{
    public class Links
    {
        public string next { get; set; }
        public string self { get; set; }
    }

    public class Links2
    {
        public string self { get; set; }
    }

    public class Links3
    {
        public string stream_key { get; set; }
        public string self { get; set; }
        public string videos { get; set; }
        public string commercial { get; set; }
        public string chat { get; set; }
        public string features { get; set; }
    }

    public class Channel
    {
        public object banner { get; set; }
        public int _id { get; set; }
        public string url { get; set; }
        public object mature { get; set; }
        public List<object> teams { get; set; }
        public object status { get; set; }
        public object logo { get; set; }
        public string name { get; set; }
        public object video_banner { get; set; }
        public string display_name { get; set; }
        public string created_at { get; set; }
        public int delay { get; set; }
        public object game { get; set; }
        public Links3 _links { get; set; }
        public string updated_at { get; set; }
        public object background { get; set; }
    }

    public class Follow
    {
        public string created_at { get; set; }
        public Links2 _links { get; set; }
        public Channel channel { get; set; }
    }

    public class RootObject
    {
        public Links _links { get; set; }
        public List<Follow> follows { get; set; }
    }
}

如果你不想声明这些类，你也可以使用dynamic关键字

dynamic obj = JsonConvert.DeserializeObject(yourJsonString);
foreach(var item in obj.follows)
{
    Console.WriteLine(item.channel.name);
}

Answer 2

如果您使用json2csharp.com 为您的输入字符串构建如下类，您将获得以下类：

public class Links
{
    public string next { get; set; }
    public string self { get; set; }
}

public class Links2
{
    public string self { get; set; }
}

public class Links3
{
    public string stream_key { get; set; }
    public string self { get; set; }
    public string videos { get; set; }
    public string commercial { get; set; }
    public string chat { get; set; }
    public string features { get; set; }
}

public class Channel
{
    public object banner { get; set; }
    public int _id { get; set; }
    public string url { get; set; }
    public object mature { get; set; }
    public List<object> teams { get; set; }
    public object status { get; set; }
    public object logo { get; set; }
    public string name { get; set; }
    public object video_banner { get; set; }
    public string display_name { get; set; }
    public string created_at { get; set; }
    public int delay { get; set; }
    public object game { get; set; }
    public Links3 _links { get; set; }
    public string updated_at { get; set; }
    public object background { get; set; }
}

public class Follow
{
    public string created_at { get; set; }
    public Links2 _links { get; set; }
    public Channel channel { get; set; }
}

public class RootObject
{
    public Links _links { get; set; }
    public List<Follow> follows { get; set; }
}

现在您只需将输入 json 字符串反序列化为 RootObject 类，并使用另一个名为 Json.net 的实用程序获取输入字符串中的所有 names

string json = "JSON STRING";
RootObject root = JsonConvert.DeserializeObject<RootObject>(json);
List<string> names = root.follows.Select(follow => follow.channel.name).ToList();

foreach ( string name in names )
{
    txtBox += name + "; ";
}

Answer 3

好的，所以我现在可以使用它了，但是，如果我使用我的用户名取回 json，我会得到一大段代码，您可以在此处查看：https://api.twitch.tv/kraken/users/krysvac/follows/channels

我关注了 31 个人，但是当我在上面使用我的程序和代码时

using (var w = new WebClient())
            {
                string json_data = w.DownloadString("https://api.twitch.tv/kraken/users/" + input + "/follows/channels");

                dynamic obj = JsonConvert.DeserializeObject(json_data);
                foreach (var item in obj.follows)
                {
                    textBox1.AppendText(item.channel.name.ToString() + Environment.NewLine);                                       
                }
            }

我在我的 31 个人中得到了 25 个返回到文本框中，我不知道为什么，我在一个应该返回超过 100 个的人身上尝试了它并得到了 6 个返回。