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我试图在 C# 中使用 newtonsoft 解析相当复杂/不必要的复杂 JSON 输出，但是由于某种原因，我的解析器总是返回 null 并且没有详细说明为什么会这样。

我尝试解析的 JSON 文件示例：

   {
    "response": {
        "success": 1,
        "current_time": 1362339098,
        "prices": {
            "35": { 
                "11": { 
                    "0": { 
                        "current": {
                            "currency": "keys",
                            "value": 39,
                            "value_high": 41,
                            "date": 1357515306 
                        },
                        "previous": { 
                            "currency": "keys",
                            "value": 37,
                            "value_high": 39
                        }
                    }
                },
                "3": { 
                    "0": { 
                        "current": {
                            "currency": "metal",
                            "value": 0.33,
                            "value_high": 0.66
                        }
                    }
                }
            },
            "5002": { 
                "6": {
                    "0": {
                        "current": {
                            "currency": "usd",
                            "value": 0.39,
                            "value_high": 0.42,
                            "date": 1358090106
                        }
                    }
                }
            },                          
            "5022": {
                "6": {
                    "1": { 
                        "current": {
                            "currency": "metal",
                            "value": 1.33,
                            "value_high": 1.55,
                            "date": 1357515175
                        }
                    }
                }
            }
        }
    }
}

还有我正在使用的 C# 解析器。我运行 getCurrentPrices() 以返回 PriceParser 对象，但返回的对象始终为空。

using System;
using System.Collections.Generic;
using System.IO;
using Newtonsoft.Json;
using System.Diagnostics;

namespace SteamBot
{
    class PriceParser
    {
        //Methods
        public PriceParser updatePrices()
        {
            var json = File.ReadAllText("test.json");
            ParserResult result = JsonConvert.DeserializeObject<ParserResult>(json);
            return result.result;
        }

        public Data currentPrices { get; set; }

        //DATA
        public class Data
        {
            public Response Response { get; set; }
        }

        public class Response 
        {
           public string success { get; set; }
           public string current_time {get; set;}
          public List<Price> prices { get; set;}
        }

        public class Price
        {
            public int defindex { get; set; }
            public int quality { get; set; }
            public Current current { get; set; }
            public Previous previous { get; set; }
        }

        public class Current
        {
            public string currency { get; set; }
            public float value { get; set; }
            public float value_high { get; set; }
            public int date { get; set; }
        }

        public class Previous
        {
            public string currency { get; set; }
            public float value { get; set; }
            public float value_high { get; set; }
            public int date { get; set; }
        }

        protected class ParserResult
        {
            public PriceParser result { get; set; }
        }
    }
}

我可能只是错过了一些愚蠢的东西，但对于我的生活，我无法弄清楚是什么，任何有更多 JSON 争论经验的人都知道这里发生了什么？

4

1 回答 1

5

您得到空值是因为您的类结构与您的 JSON 不匹配。

第一个问题是ParserResult当你应该使用Data. Data有一个response属性，匹配你的 JSON。 ParserResult没有这个属性。

第二个问题是您已定义prices为 a List<Price>，但您的 JSON 不包含数组。相反，JSON 结构实际上是一系列嵌套的字典。

尝试像这样定义你的内部类：

public class Data
{
    public Response response { get; set; }
}

public class Response
{
    public int success { get; set; }
    public long current_time { get; set; }
    public IDictionary<int, IDictionary<int, IDictionary<int, Price>>> prices { get; set; }
}

public class Price
{
    public Quote current { get; set; }
    public Quote previous { get; set; }
}

public class Quote
{
    public string currency { get; set; }
    public decimal value { get; set; }
    public decimal value_high { get; set; }
    public long date { get; set; }
}

然后，在您的updatePrices方法中，您可以像这样反序列化：

public PriceParser updatePrices()
{
    var json = File.ReadAllText("test.json");
    currentPrices = JsonConvert.DeserializeObject<Data>(json);
    return this;
}

以下是转储数据的方法：

PriceParser parser = new PriceParser();
parser.updatePrices();

foreach (var defindex in parser.currentPrices.response.prices)
{
    Console.WriteLine("defindex: " + defindex.Key);
    foreach (var quality in defindex.Value)
    {
        Console.WriteLine("\t quality: " + quality.Key);
        foreach (var price in quality.Value)
        {
            Console.WriteLine("\t\t index: " + price.Key);
            Console.WriteLine("\t\t\t current price:");
            Console.WriteLine("\t\t\t\t currency: " + price.Value.current.currency);
            Console.WriteLine("\t\t\t\t value: " + price.Value.current.value);
            Console.WriteLine("\t\t\t\t value_high: " + price.Value.current.value_high);
            if (price.Value.previous != null)
            {
                Console.WriteLine();
                Console.WriteLine("\t\t\t previous price:");
                Console.WriteLine("\t\t\t\t currency: " + price.Value.previous.currency);
                Console.WriteLine("\t\t\t\t value: " + price.Value.previous.value);
                Console.WriteLine("\t\t\t\t value_high: " + price.Value.previous.value_high);
            }
        }
    }
}

这是上面的输出：

defindex: 35
         quality: 3
                 index: 0
                         current price:
                                 currency: metal
                                 value: 0.33
                                 value_high: 0.66
         quality: 11
                 index: 0
                         current price:
                                 currency: keys
                                 value: 39
                                 value_high: 41

                         previous price:
                                 currency: keys
                                 value: 37
                                 value_high: 39
defindex: 5002
         quality: 6
                 index: 0
                         current price:
                                 currency: usd
                                 value: 0.39
                                 value_high: 0.42
defindex: 5022
         quality: 6
                 index: 1
                         current price:
                                 currency: metal
                                 value: 1.33
                                 value_high: 1.55
于 2013-11-06T06:05:15.477 回答