Newtonsoft Json dynamic objects

Question

i am trying to access the values from ETH_MOD etc. inside a foreach to output the name like ETH_MOD and the last value. the problem is that the keys like ETH_MOD and ETH_LTG are dynamic. They change from time to time and also more new pairs are added.

hope somebody understand my problem and can help ;)

in php i am doing it like this. Here i have the "Name" in $key

$cls = json_decode($json);
foreach ($cls as $key => $value) {  
    $last= transformNumber($value->last);
    $bid= transformNumber($value->bid);
    $ask= transformNumber($value->ask);
}

kind regards

{
  "returnTicker": {
    "ETH_MOD": {
      "tokenAddr": "0x957c30ab0426e0c93cd8241e2c60392d08c6ac8e",
      "quoteVolume": 401812,
      "baseVolume": 2398.702,
      "last": 0.005690802,
      "percentChange": 0.0737,
      "bid": 0.005650001,
      "ask": 0.00579
    },
    "ETH_LTG": {
      "tokenAddr": "0x0879e0c9822b75f31f0b0ed2a30be9f484a57c2f",
      "quoteVolume": 35336143,
      "baseVolume": 1767.741,
      "last": 4.9993E-05,
      "percentChange": 3.1661,
      "bid": 4.65E-05,
      "ask": 4.874E-05
    },
    "ETH_ATM": {
      "tokenAddr": "0x9b11efcaaa1890f6ee52c6bb7cf8153ac5d74139",
      "quoteVolume": 9114955.042,
      "baseVolume": 1641.045,
      "last": 0.000177983,
      "percentChange": -0.0167,
      "bid": 8.0009E-05,
      "ask": 8.38E-05
    },
    "ETH_VERI": {
      "tokenAddr": "0x8f3470a7388c05ee4e7af3d01d8c722b0ff52374",
      "quoteVolume": 3632.34,
      "baseVolume": 617.863,
      "last": 0.164501,
      "percentChange": -0.015,
      "bid": 0.168,
      "ask": 0.1695
    },
    "ETH_ITS": {
      "tokenAddr": "0xfd784da5c740c617aafb80399fa81b86e1da99a5",
      "quoteVolume": 206921.3,
      "baseVolume": 124.563,
      "last": 0.000506,
      "percentChange": 0.3316,
      "bid": 0.0002667,
      "ask": 0.0005588
    }
  },
  "trades": [],
  "orders": {
    "buys": [],
    "sells": []
  }
}

i have the json string like posted but much longer. the childs from returnTicker like ETH_MOD are dynamic. the list updates all the time. How can i access the element like ETH_MOD withouth knowing the names before? — nowkin, Oct 30 '17 at 11:37
i try to loop with foreach and try to output the name like eth_atm and the last value — nowkin, Oct 30 '17 at 11:39
https://stackoverflow.com/questions/3142495/deserialize-json-into-c-sharp-dynamic-object - here, some info about dynamic JSON and C#. Good luck with that crypto-traiding. — Pavel Oganesyan, Oct 30 '17 at 11:40
thanks pavel. but there i get the problem that i dont know all the names like ETH_VERI before. how i can access them than to output the data in a foreach? — nowkin, Oct 30 '17 at 11:43

Pavel Oganesyan · Accepted Answer · 2017-10-30T12:11:34.607

3

This will give you a hint (i placed your JSON in rawJson string variable):

using Newtonsoft.Json.Linq;//use Nuget to get Newtonsoft package

    ...
    ...

   dynamic task = JObject.Parse(rawJson);
   var ticker = task.returnTicker;
   foreach (var pair in ticker)
   {              
     Console.WriteLine(pair.Name); //ETH_MOD and others 
     Console.WriteLine(pair.Value);//JSONs with details
    }

edited Oct 30 '17 at 12:11

answered Oct 30 '17 at 12:02

Pavel Oganesyan

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score 0 · Answer 2 · answered Oct 30 '17 at 12:21

You can mark returnTicker as:

[JsonProperty]
private IDictionary<string, JToken> returnTicker;

If you want to get underlying data from it you may cast it to required object like this:

foreach (var pair in returnTicker) {
  if ("ETH_MOD" == pair.Key) {
  MyEHT_MOD_class object = pair.Value.ToObject<MyEHT_MOD_class>();
  ... // use object
  }
  ...
}

Then just use MyEHT_MOD_class object that contains fields that you need.

If there are may be extra elements in your object and you do not want to miss it you can mark some fild as:

[JsonExtensionData]
private IDictionary<string, JToken> extraStuff;

In general, declare as JsonProperty and use that fields that you need. If there are some new fields that you are not use then it's okay, you may check for _extraStuff and inform user.

Newtonsoft Json dynamic objects

2 Answers2