Question

我有一个Json数据，请建议我如何阅读这种类型的Json。

    {"Questions": [

      {
          "Question": "Who was the Chola King who brought Ganga from North to South?",
          "CorrectAnswer": 1,
          "Answers": [
           {
              "Answer": "Raja Raja Chola"
           },
           {
              "Answer": "Rajendra Chola"
           },
           {
              "Answer": "Parantaka"
           },
           {
              "Answer": "Mahendra"
           }
       ]
    }, 
    {
       "Question": "The writ of 'Habeas Corpus' is issued in the event of:",
       "CorrectAnswer":  2  ,
       "Answers": [
        {
          "Answer": "Loss of Property"
        },
        {
          "Answer": "Refund of Excess Taxes"
        },
        {
          "Answer": "Wrongful Police Detention"
        },
          {
          "Answer": "Violation of the Freedom of Speech"
         }
         ]}
   ]}

Answer 1

Newtonsoft.Json是我最喜欢的操纵JSON的库。
你的代码应该是这样的：

<强> EDITED

    public class AnswerObj{

       public string Answer{get;set;}

    }

    public class QuestionObj{

       public string Question {get;set;}

       public int CorrectAnswer {get;set;}

       public List<AnswerObj> Answers {get;set;}
    }

    public class QuestionsRepository
    {
       public List<QuestionObj> Questions {get;set;}
    }

    //Here is the code for reading your JSON
    string json = "Your_JSON_COMES_HERE as a string"

    QuestionsRepository questions = JsonConvert.DeserializeObject<QuestionsRepository>(json);

Answer 2

您可以使用内置的.NET，DataContractJsonSerializer类，它可用于序列化和反序列化json字符串。（MSDN Link）

以下是MSDN中的完整教程：（How to: Serialize and Deserialize JSON data）

Answer 3

我更喜欢至少使用框架。看看我的代码。

对于给定的对象结构：

public class QuestionsRepository
{
    public List<QuestionObj> Questions;
}

public class QuestionObj
{
    public string Question;
    public UInt16 CorrectAnswer;
    public AnswerObj[] Answers;
}

public class AnswerObj
{
    public string Answer;
}

声明一些简单的最简单的包装器：

public static class JsonUtils
{
    class JsonSerializer<T>
    {
        static DataContractJsonSerializer xs = new DataContractJsonSerializer(typeof(T));

        public static object DeserializeObject(string serializedData, Encoding encoding)
        {
            byte[] data = encoding.GetBytes(serializedData);
            MemoryStream sr = new MemoryStream(data);
            return xs.ReadObject(sr);
        }

        public static string SerializeObject(T obj, Encoding encoding)
        {
            MemoryStream ms = new MemoryStream();
            xs.WriteObject(ms, obj);
            byte[] data = ms.ToArray();
            return encoding.GetString(data);
        }
    }

    public static T DeserializeObject<T>(this string serializedData)
    {
        return (T)JsonSerializer<T>.DeserializeObject(serializedData, Encoding.Default);
    }

    public static string SerializeObject<T>(this T obj)
    {
        return JsonSerializer<T>.SerializeObject(obj, Encoding.Default);
    }
}

样品：

class Program
{
    static void Main()
    {
        try
        {
            string json = "{\"Questions\": [{ \"Question\": \"Who was the Chola King who brought Ganga from North to South?\", \"CorrectAnswer\": 1, \"Answers\": [ { \"Answer\": \"Raja Raja Chola\" }, { \"Answer\": \"Rajendra Chola\" }, { \"Answer\": \"Parantaka\" }, { \"Answer\": \"Mahendra\" } ] }, { \"Question\": \"The writ of 'Habeas Corpus' is issued in the event of:\", \"CorrectAnswer\": 2 , \"Answers\": [{ \"Answer\": \"Loss of Property\" }, { \"Answer\": \"Refund of Excess Taxes\" }, { \"Answer\": \"Wrongful Police Detention\" }, { \"Answer\": \"Violation of the Freedom of Speech\" }] }]}}";

            QuestionsRepository newRepository = json.DeserializeObject<QuestionsRepository>();
            for (int i = 0; i < newRepository.Questions.Count; i++)
            {
                Console.WriteLine("{0}", newRepository.Questions[i].Question);
                int count = 1;
                foreach (var answer in newRepository.Questions[i].Answers)
                {
                    Console.WriteLine("\t{0}) {1} ({2})", count, answer.Answer, newRepository.Questions[i].CorrectAnswer == count ? "+" : "-");
                    count++;
                }
            }
        }
        catch (SerializationException serEx)
        {
            Console.WriteLine(serEx.Message);
            Console.WriteLine(serEx.StackTrace);
        }
    }
}

P.S。：类必须是顶级enities，默认构造函数可用（数据序列化程序的可见，可访问类）将在DataContractJsonSerializer中使用

如何阅读这种类型的Json

3 个答案: