JSON 在 C# 中：如何获取某个 class 下方的 json 字符串中的所有对象？

Question

我正在尝试获取应用程序下方的所有内容并将值放入 Dictionary<string, Games>

我正在使用下面的代码。

Class:

public class Games
{
    public int AppId { get; set; }
    public string Name { get; set; }

}

代码：

public Dictionary<string, Games>   GetAllGames()
        {
            //http://api.steampowered.com/ISteamApps/GetAppList/v0002/?key=STEAMKEY&format=json

            var url = "http://api.steampowered.com/ISteamApps/GetAppList/v0002/?key=STEAMKEY&format=json";

            HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(string.Format(url));

            WebReq.Method = "GET";

            HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();

            Console.WriteLine(WebResp.StatusCode);
            Console.WriteLine(WebResp.Server);

            string jsonString;
            using (Stream stream = WebResp.GetResponseStream())
            {
                StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8);
                jsonString = reader.ReadToEnd();
            }
            var t = JObject.Parse(jsonString).SelectToken("applist").ToString();
            var  s = JObject.Parse(t).SelectToken("apps").ToString();

            Dictionary<string, Games> gamesList = JsonConvert.DeserializeObject<Dictionary<string, Games>>(s);



            return gamesList;            

        }

错误：

Newtonsoft.Json.JsonSerializationException
  HResult=0x80131500
  Message=Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'System.Collections.Generic.Dictionary`2[System.String,LudumPricer.Games]' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.
To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
Path '', line 1, position 1.

JSON样本：

{
   "applist":{
      "apps":[
         {
            "appid":5,
            "name":"Dedicated Server"
         },
         {
            "appid":7,
            "name":"Steam Client"
         },
         {
            "appid":8,
            "name":"winui2"
         },
         {
            "appid":10,
            "name":"Counter-Strike"
         }
      ]
   }
}

我想获取 apps 属性下的所有内容并将它们放入 Dictionary <string, Games>

我正在使用 newtonsoft json.net 库

Answer 1

只需转换并使用ToDictionary

给定

public class App
{
    public int appid { get; set; }
    public string name { get; set; }
}

public class Applist
{
    public List<App> apps { get; set; }
}

public class RootObject
{
    public Applist applist { get; set; }
}

用法

var root = JsonConvert.DeserializeObject<RootObject>(jsonString);
var dict = root.applist.apps.ToDictionary(x => x.appid, x => x.name);

Enumerable.ToDictionary Method (IEnumerable, Func)

Creates a Dictionary from an IEnumerable according to a specified key selector function.

JSON 在 C# 中：如何获取某个 class 下方的 json 字符串中的所有对象？

JSON in C#: How do I get all objects in a json string below a certain class?

c#

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json.net

json-deserialization

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