Update a numeric property of a JSON object in an array

Question

My JSON config.json:

[  
   {  
      "names":"Steam",
      "count": 1,
   },
   {  
      "names":"game",
      "count": 2,
   }
]

I need to update count's property in the array in c#. I tried

JObject objectproperty = JObject.Parse(File.ReadAllText(@"config.json"));

but this gives me the error

Newtonsoft.Json.JsonReaderException: "Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path '', line 1, position 1."

The exception message tells you the solution. Use JArray for arrays, not JObject (which is, obviously, for objects) — Camilo Terevinto
– Camilo Terevinto, Commented Jun 30, 2018 at 23:56
I misstiped Mardoxx. Anyways this wasn't my problem in the first place — oSumAtrIX
– oSumAtrIX, Commented Jul 1, 2018 at 11:31

Tony · Accepted Answer · 2018-07-01 01:53:16Z

2

You can use a JToken
Assuming that your JSON is:
(notice I had to remove some ,)

[  
   {  
      "names":"Steam",
      "count": 1
   },
   {  
      "names":"game",
      "count": 2
   }
]

You can use this:

var config_file = @"config.json";

var objectproperty = JToken.Parse(File.ReadAllText(config_file));
foreach (var obj in objectproperty)
{
    var count = (long)obj["count"];

    obj["count"] = count * 3;
}

System.IO.File.WriteAllText(config_file, objectproperty.ToString());

edited Jul 1, 2018 at 1:53

answered Jul 1, 2018 at 1:33

Tony

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