C＃接收JSON字符串，但無法反序列化

Question

我有了反序列化包裹在「結果」根對象數據的陣列，使用Netwonsoft.Json包從的NuGet

應用JSON字符串是正是這種：

{"results":[{"Coin":"SBD","LP":0.000269,"PBV":-54.36,"MACD1M":true,"MACD30M":true,"MACD1H":true,"MACD1D":true},{"Coin":"XMR","LP":0.027135,"PBV":11.44,"MACD1M":true,"MACD30M":true,"MACD1H":true,"MACD1D":true}]} 

這JSON字符串是從一個控制檯應用程序我做創建的，我希望它看起來像這樣https://bittrex.com/Api/v2.0/pub/market/GetTicks?marketName=BTC-NEO&tickInterval=hour

我的類看起來像這樣

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace WindowsFormsApp2 
{ 
    public class Result 
    { 
     public string Coins { get; set; } 
     public decimal LastPrice { get; set; } 
     public decimal PercentBuyVolume { get; set; } 
    } 

    public class RootObject 
    { 
     public List<Result> results { get; set; } 
    } 
} 

在主窗體中，我有一個函數可以從JSON（我有運行Apache的XAMPP）的URL下載並將其反序列化到一個數組中。它看起來像這樣：

private void DownloadBittrexData() 
     { 

      int PanelID = 0; 
      var Coin = new List<string>(); 
      var LastPrice = new List<decimal>(); 
      var PercentBuyVolume = new List<decimal>(); 
      var MACD1M = new List<bool>(); 
      var MACD30M = new List<bool>(); 
      var MACD1H = new List<bool>(); 
      var MACD1D = new List<bool>(); 

      var client = new WebClient(); 

      var URL = client.DownloadString("http://localhost/test.json"); 
      Console.WriteLine("Json String from URL: " + URL); 
      var dataDeserialized = JsonConvert.DeserializeObject<RootObject>(URL); 
      foreach (var data in dataDeserialized.results) 
      { 
       Coin.Add(data.Coins); 
       LastPrice.Add(data.LastPrice); 
       PercentBuyVolume.Add(data.PercentBuyVolume); 

      } 
      int sizeOfArrayClose = Coin.Count - 1; 

      for (int i = 0; i <= sizeOfArrayClose; i++) 
      { 
       Console.WriteLine("Coin: " + Coin[i]); 
       Console.WriteLine("Lastprice: " + LastPrice[i]); 
       Console.WriteLine("PBV: " + PercentBuyVolume[i]); 
      } 
     } 

Newtonsoft.Json是在窗體的開頭System.Net一起申報當然

using System.Net; 
using Newtonsoft.Json; 

輸出看起來是這樣的：

Json String from URL: {"results":[{"Coin":"SBD","LP":0.000269,"PBV":-54.36,"MACD1M":true,"MACD30M":true,"MACD1H":true,"MACD1D":true},{"Coin":"XMR","LP":0.027135,"PBV":11.44,"MACD1M":true,"MACD30M":true,"MACD1H":true,"MACD1D":true}]} 
Coin: 
Lastprice: 0 
PBV: 0 
Coin: 
Lastprice: 0 
PBV: 0 

這就像下載它後無法反序列化它。 我該怎麼辦？非常感謝你。

Answer 1

我想我的系統中您確切的代碼，我能按預期檢索結果。希望這有幫助，這很容易理解。

這裏是主類

static void Main(string[] args) 
    { 

     RootObject configfile = LoadJson(); 

     foreach (var tResult in configfile.results) 
     { 
      Console.WriteLine("Coin: " + tResult.Coin); 
      Console.WriteLine("Lastprice: " + tResult.LP); 
      Console.WriteLine("PBV: " + tResult.PBV); 
     } 


     Console.ReadLine(); 

    } 

LoadJson功能將

private static RootObject LoadJson() 
    { 
     string json = "{\"results\":[{\"Coin\":\"SBD\",\"LP\":0.000269,\"PBV\":-54.36,\"MACD1M\":true,\"MACD30M\":true,\"MACD1H\":true,\"MACD1D\":true},{\"Coin\":\"XMR\",\"LP\":0.027135,\"PBV\":11.44,\"MACD1M\":true,\"MACD30M\":true,\"MACD1H\":true,\"MACD1D\":true}]}"; 



     RootObject configs = Deserialize<RootObject>(json); 
     return configs; 
    } 

和反序列化功能將是

private static T Deserialize<T>(string json) 
    { 
     T unsecureResult; 
     string _DateTypeFormat = "yyyy-MM-dd HH:mm:ss"; 
     DataContractJsonSerializerSettings serializerSettings = new DataContractJsonSerializerSettings(); 
     DataContractJsonSerializer serializer; 
     MemoryStream ms; 
     unsecureResult = default(T); 
     serializerSettings.DateTimeFormat = new System.Runtime.Serialization.DateTimeFormat(_DateTypeFormat); 

     serializer = new DataContractJsonSerializer(typeof(T)); 
     ms = new MemoryStream(Encoding.Unicode.GetBytes(json)); 

     unsecureResult = (T)serializer.ReadObject(ms); 

     return unsecureResult; 
    } 

，現在你的數據模型將

public class Result 
{ 

    public string Coin { get; set; } 
    public double LP { get; set; } 
    public double PBV { get; set; } 
    public bool MACD1M { get; set; } 
    public bool MACD30M { get; set; } 
    public bool MACD1H { get; set; } 
    public bool MACD1D { get; set; } 

} 

public class RootObject 
{ 
    public List<Result> results { get; set; } 
} 

Answer 2

模型應該是這樣的反序列化JSON

public class Result 
{ 
    public string Coin { get; set; } 
    public double LP { get; set; } 
    public double PBV { get; set; } 
    public bool MACD1M { get; set; } 
    public bool MACD30M { get; set; } 
    public bool MACD1H { get; set; } 
    public bool MACD1D { get; set; } 
} 

public class RootObject 
{ 
    public List<Result> results { get; set; } 
} 

LastPrice and PercentBuyVolume不是你的模型這就是它得到一個錯誤的原因提供。

Answer 3

您的屬性名稱不會映射到JSON中的字段名稱。您可以重命名您的C＃屬性以匹配JSON，但它會導致無法讀取的下游代碼。

相反，你應該你的屬性（與漂亮的，可讀的名稱）映射到出現在JSON的名稱，使用JsonPropertyAttribute：

public class Result 
{ 
    public string Coin { get; set; } //didn't bother here: changed property name to Coin 
    [JsonProperty("LP")] 
    public decimal LastPrice { get; set; } 
    [JsonProperty("PBV")] 
    public decimal PercentBuyVolume { get; set; } 
}