c# - 在c#中解析JSON返回空值

Question

我正在尝试用 C# 解析 Json 。 (我是 Json 初学者)

WebRequest webRequest = WebRequest.Create(url);
                        var httpWebRequest = (HttpWebRequest)webRequest;
                        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

                        String responseText = "";
                        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                        {
                            responseText = streamReader.ReadToEnd();
                        }

//

这是responseText中的输出:

{
  "disclaimer": "Exchange rates provided for informational purposes only and do not constitute financial advice of any kind. Although every attempt is made to ensure quality, no guarantees are made of accuracy, validity, availability, or fitness for any purpose. All usage subject to acceptance of Terms: https://openexchangerates.org/terms/",
  "license": "Data sourced from various providers; resale prohibited; no warranties given of any kind. All usage subject to License Agreement: https://openexchangerates.org/license/",
  "timestamp": 1454497211,
  "base": "EUR",
  "rates": {
    "INR": 74.42686146,
    "USD": 1.0929332
  }
}

从 Json 获取基础

var obj = JObject.Parse(responseText);
String bcur = (string)obj["base"];
Console.WriteLine("base :"bcur.ToString());


Output : base :EUR 

类似地，为了获取 INR 的汇率，我写道

var obj = JObject.Parse(responseText);
    String rte= (string)obj["INR"];
    Console.WriteLine("rate:"rte);

it gives me null.

谁能告诉我我的代码有什么问题吗？或者更好的方式来获取货币的基础和汇率。

Answer 1

INR 不在基础对象中，因此您要在不存在的位置查找 INR 属性。为了访问 中的属性，您必须分两步进行。修改上面的代码，它看起来像这样:

var obj = JObject.Parse(responseText);
JObject rates = (JObject)obj["rates"];
string rte = (string)rates["INR"];
Console.WriteLine("rate:" + rte);