我正在尝试使用 C# 中的 newtonsoft 解析相当复杂/不必要的复杂 JSON 输出,但由于某种原因,我的解析器总是返回 null,并且没有详细说明为什么会出现这种情况。
我尝试解析的 JSON 文件的示例:
{
"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
}
}
}
}
}
}
}
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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 null。
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; }
}
}
}
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我可能只是错过了一些愚蠢的东西,但对于我的一生,我无法弄清楚什么,任何有更多 JSON 争论经验的人都知道这里发生了什么?
您收到 null 值是因为您的类结构与 JSON 不匹配。
ParserResult第一个问题是,当您应该使用 时,您却反序列化为Data。 Data有一个response属性,与您的 JSON 匹配。 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; }
}
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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;
}
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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);
}
}
}
}
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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
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