Linq query JObject

Question

I am using Json.net for serializing and then making an JObject that looks like this:

 \"RegistrationList\": [
    {
      \"CaseNumber\": \"120654-1330\",
           


        

Answer 1

Several ways:

1) According documentation 'Using LINQ for JSON' you can query JObject in LINQ way

JObject o = JObject.Parse(@"{
  'CPU': 'Intel',
  'Drives': [
    'DVD read/writer',
    '500 gigabyte hard drive'
  ]
}");

string cpu = (string)o["CPU"];
// Intel

string firstDrive = (string)o["Drives"][0];
// DVD read/writer

IList allDrives = o["Drives"].Select(t => (string)t).ToList();
// DVD read/writer
// 500 gigabyte hard drive

2) Querying JSON with SelectToken

3) Use custom helper extention method for querying by specified path like this:

public static class JsonHelpers
{
    public static JToken QueryJson(this object jsonObject, params string[] jsonPath)
    {
        const string separator = " -> ";

        if (jsonObject == null)
            throw new Exception(string.Format("Can not perform JSON query '{0}' as the object is null.",
                string.Join(separator, jsonPath ?? new string[0])));

        var json = (jsonObject as JToken) ?? JObject.FromObject(jsonObject);
        var token = json;
        var currentPath = "";

        if (jsonPath != null)
            foreach (var level in jsonPath)
            {
                currentPath += level + separator;
                token = token[level];
                if (token == null) break;
            }

        if (token == null)
            throw new Exception(string.Format("Can not find path '{0}' in JSON object: {1}", currentPath, json));

        return token;
    }
}