将JSON.NET JObject的属性/标记转换为字典键

我正在使用JSON.NET使用.NET解析来自openexhangerates.org服务器端的JSON响应。 响应包含一个嵌套对象（“rates”），它有一长串数字属性：

{ "disclaimer": "Exchange rates provided for informational purposes only, with no guarantee whatsoever of accuracy, validity, availability, or fitness for any purpose; use at your own risk. Other than that, have fun! Usage subject to acceptance of terms: http://openexchangerates.org/terms/", "license": "Data sourced from various providers with public-facing APIs; copyright may apply; not for resale; no warranties given. Usage subject to acceptance of license agreement: http://openexchangerates.org/license/", "timestamp": 1357268408, "base": "USD", "rates": { "AED": 3.673033, "AFN": 51.5663, "ALL": 106.813749, "AMD": 403.579996, etc... } } 

属性名称对应于货币类型（例如“USD”）。 我需要假设属性列表可以随着时间的推移而改变，所以我想将对象转换为Dictionary而不是相应的C＃对象。

因此，而不是将JSON对象反序列化为这样的东西：

 class Rates { public decimal AED; // United Arab Emirates Dirham public decimal AFN; // Afghan Afghani public decimal ALL; // Albanian Lek public decimal AMD; // Armenian Dram // etc... } 

我想最终得到这个：

 Dictionary() {{"AED",0.2828},{"AFN",0.3373},{"ALL",2.2823},{"AMD",33.378} // etc...}; 

如何从响应字符串或通过调用JObject.Parse（responseString）生成的JObject开始？

Answer 1

JObject已经实现了IDictionary ，所以我怀疑当你导航到rates成员时，你应该可以使用：

 var result = rates.ToDictionary(pair => pair.Key, pair => (decimal) pair.Value); 

不幸的是，它使用显式接口实现，这使得这有点痛苦 – 但如果你通过IDictionary接口，它没关系。

这是一个简短但完整的示例，它似乎与您提供的JSON一起使用（保存到test.json文件中）：

 using System; using System.Collections.Generic; using System.IO; using System.Linq; using Newtonsoft.Json.Linq; class Test { static void Main() { JObject parsed = JObject.Parse(File.ReadAllText("test.json")); IDictionary rates = (JObject) parsed["rates"]; // Explicit typing just for "proof" here Dictionary dictionary = rates.ToDictionary(pair => pair.Key, pair => (decimal) pair.Value); Console.WriteLine(dictionary["ALL"]); } } 

Answer 2

这对你有用吗？

 using System; using System.Collections.Generic; using System.Linq; using Newtonsoft.Json.Linq; namespace JsonNetTest { class Program { static void Main(string[] args) { string jsonString = @"{ 'disclaimer': 'Exchange rates provided for informational purposes only, with no guarantee whatsoever of accuracy, validity, availability, or fitness for any purpose; use at your own risk. Other than that, have fun! Usage subject to acceptance of terms: http://openexchangerates.org/terms/', 'license': 'Data sourced from various providers with public-facing APIs; copyright may apply; not for resale; no warranties given. Usage subject to acceptance of license agreement: http://openexchangerates.org/license/', 'timestamp': 1357268408, 'base': 'USD', 'rates': { 'AED': 3.673033, 'AFN': 51.5663, 'ALL': 106.813749, 'AMD': 403.579996 } }"; JObject parsed = JObject.Parse(jsonString); Dictionary rates = parsed["rates"].ToObject>(); Console.WriteLine(rates["ALL"]); Console.ReadKey(); } } } 

Answer 3

如果您希望子对象具有对象属性（或字段），则最好使用：

 Dictionary rates = parsed["rates"].ToObject>(); 

否则，它将抛出一个错误。