转换一个JSON.NET JObject的属性/令牌,字典键 [英] Converting a JSON.NET JObject's Properties/Tokens into Dictionary Keys
问题描述
我使用JSON.NET解析从openexhangerates.org服务器端使用.NET一个JSON效应初探。响应包含一个嵌套的对象(差饷),其中有数值属性的一个长长的清单:
I'm using JSON.NET to parse a JSON reponse from openexhangerates.org server side using .NET. The response contains a nested object ("rates") which has a long list of numeric properties:
{
"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: 美元)。我需要假设属性的列表可以随时间而改变,所以我想将对象转换成一个字典,而不是一个相应的C#对象。
The property names correspond to the currency type (e.g. "USD"). I need to assume that the list of properties can change over time, so I want to convert the object into a Dictionary instead of a corresponding C# object.
因此,而不是反序列化JSON对象弄成这个样子:
So instead of deserializing the JSON object into something like this:
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...
}
我想结束了这一点:
I want to end up with this:
Dictionary<string,decimal>() {{"AED",0.2828},{"AFN",0.3373},{"ALL",2.2823},{"AMD",33.378} // etc...};
我如何做到这一点无论从响应字符串或致电JObject.Parse产生的JObject开始(responseString)?
How do I do this starting from either the response string or from the JObject produced by calling JObject.Parse(responseString)?
推荐答案
JObject
已经实现了 IDictionary的<字符串,JToken>
,所以我怀疑,当您浏览到的率
成员,你应该能够使用:
JObject
already implements IDictionary<string, JToken>
, so I suspect that when you've navigated down to the rates
member, you should be able to use:
var result = rates.ToDictionary(pair => pair.Key, pair => (decimal) pair.Value);
不幸的是,它使用显式接口实现,这使它成为一个有点痛 - 但是如果你通过去在的IDictionary<字符串,JToken>
接口,它的罚款
下面是这似乎工作很短,但完整的例子。与您所提供的JSON(保存到 test.json
文件):
Here's a short but complete example which appears to work with the JSON you've provided (saved into a test.json
file):
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<string, JToken> rates = (JObject) parsed["rates"];
// Explicit typing just for "proof" here
Dictionary<string, decimal> dictionary =
rates.ToDictionary(pair => pair.Key,
pair => (decimal) pair.Value);
Console.WriteLine(dictionary["ALL"]);
}
}
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