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...
}
}
The property names correspond to the currency type (eg "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.
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...
}
I want to end up with this:
Dictionary<string,decimal>() {{"AED",0.2828},{"AFN",0.3373},{"ALL",2.2823},{"AMD",33.378} // etc...};
How do I do this starting from either the response string or from the JObject produced by calling JObject.Parse(responseString)?
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);
Unfortunately it uses explicit interface implementation, which makes this a bit of a pain - but if you go via the IDictionary<string, JToken>
interface, it's fine.
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"]);
}
}
Does this work for you?
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<string, decimal> rates = parsed["rates"].ToObject<Dictionary<string, decimal>>();
Console.WriteLine(rates["ALL"]);
Console.ReadKey();
}
}
}
If you're expecting the child object to have an object property(or field), it's better to use:
Dictionary<string, object> rates = parsed["rates"].ToObject<Dictionary<string, object>>();
Otherwise, it will throw an error.
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