Develop Reference

Cannot access a jObject token in c#

I have the following json called 'originalJson'
{
"user_active": true,
"user_firstname": "Bob",
"user_lastname": "Tester",
"user_displayname": "Bobby",
"user_primary_email": "bob#tester.com",
"user_login_enabled": true,
"user_profile": {
"user_locale": "en-gb",
"user_lang": "en-gb"
},
"user_identities": [],
"user_roles": [
{
"app_id": "74a019c9-7171-4af0-a773-3984edaa35ca",
"context_uuid": "74a019c9-7171-4af0-a773-3984edaa35ca",
"context_type": "context_application",
"role_oid": "test_role_a",
"role_start_date": "2020-06-27T13:00:00Z",
"role_end_date": "2021-06-27T13:00:00Z"
}
]
}
and I am trying to replace the role_start_date and role_end_date values.
I have tried the following
JObject jObj = JObject.Parse(originalJson);
jObj["user_roles"]["role_start_date"] = somenewstartDate;
jObj["user_roles"]["role_end_date"] = somenewendDate;
However it is failing and doesn't like the "jObj["user_roles"]["role_start_date"]". I thought it would be pretty simple to do, I must be missing something.
Any ideas?

The property "user_roles" is an array of objects not a single object. You are trying to set a property value in the first entry in that array, so you need to do:
jObj["user_roles"][0]["role_start_date"] = somenewstartDate;
jObj["user_roles"][0]["role_end_date"] = somenewendDate;

Filter parsed JSON object

I am making rest call and receving following JSON response:
{
"issues": [{
"id": "250271",
"self": "KeyUrl1",
"key": "Key-8622",
"fields": {
"attachment": [{
"self": "AttachmentUrl1",
"id": "106198",
"filename": "export.htm"
}
],
"customfield_11041": "Test"
}
},
{
"id": "250272",
"self": "KeyUrl2",
"key": "Key-8621",
"fields": {
"attachment": [{
"self": "AttachmentUrl2",
"id": "106199",
"filename": "lmn.htm"
}
],
"customfield_11041": "Test"
}
},
]
}
I parsed it using NewtonSoft Json to JObject.
var jObject = JObject.Parse(response);
Further I am trying to filter such records where either attachment is missing or none of the attachments contain filename like "export".
Following is the code I have written, ideally it should result in just 1 record in the records object, however its returning both the objects.
var issues = jObject["issues"] as JArray;
var records = issues.Where(x => !x["fields"]["attachment"].Any() || !x["fields"]["attachment"].Any(y => y["filename"].Contains("export")));
Need help to figure out whats going wrong.
Here's fiddle link - https://dotnetfiddle.net/AVyIHr

The problem is that you're calling Contains("export") on the result of y["filename"], which isn't a string - it's a JToken. You need to convert to a string first, to use the form of Contains that you're expecting.
Additionally, you can get rid of the first condition - an issue with no attachments doesn't have any attachments with "export" filename anyway.
That leaves this:
var records = issues
.Where(x => !x["fields"]["attachment"].Any(y => ((string) y["filename"]).Contains("export")))
.ToList();
You may well find it's simpler to deserialize to a class, however - that will reduce the risk of typos and the risk of this sort of conversion error. If you deserialized to a List<Issue> you'd have a condition of:
x => !x.Fields.Attachments.Any(y => y.Filename.Contains("export"))
... which I think is rather cleaner.

var records = issues.Where(x => !x["fields"]["attachment"].Any() || !x["fields"]["attachment"].Any(y => y["filename"].ToString().Contains("export"))).ToList();
Add .ToString() will resolve the issue.

Extract first set of records in JSON C#

I have a requirement to get the first set of records in c# JSON. Here is my JSON data for example
string sJSON = "{
{
"ID": "1",
"Name":"John",
"Area": "Java" ,
"ID": "2",
"Name": "Matt",
"Area": "Oracle" ,
"ID": "3","Name":
"Danny","Area": "Android"
}
}"
I need to extract only the 1st set of records (i.e. {{"ID": "1", "Name":"John", "Area": "Java"}}).
If there is only one record my code (see below) works fine but when there are multiple records it takes the last set of JSON data (i.e. {{"ID": "3","Name": "Danny","Area": "Android"}}).
JObject jsonObject = JObject.Parse(sJSON);
string sID = (string)jsonObject["ID"];
string sName = (string)jsonObject["Name"];
string sArea = (string)jsonObject["Area"];
Can anyone help me extract only the 1st set of JSON data?

You return the JSON data as JSON Array, now it is a simple JSON string.
If you're able to generate like below then you can easily get the single JSON element easily.
[{ "ID": "1", "Name":"John", "Area": "Java" },{ "ID": "2","Name": "Matt","Area": "Oracle" },{ "ID": "3","Name": "Danny","Area": "Android" } ]
Use the below link, to understand this JSON format.
http://json.parser.online.fr/

Parse the data as JToken.
Such that you have something like:
var jToken = JToken.Parse(sJSON);
var isEnumerable = jToken.IsEnumerable()
if(isEnumeable)
{
cast as JArray and get firstOrdefault
}
var isObject = jToken.IsObject();
if(isObject )
{
cast as JObject and perform straight casting
}

Json Object parse error

I am storing data in my cassandra database as string and i want to retrieve the string and convert it into json. i get an exception saying
An unhandled exception of type 'Newtonsoft.Json.JsonReaderException' happened
is there something wrong with the data stored ? or i am doing some other thing wrong ?
My query is :
INSERT INTO table2(key1,col1) values ('5',{'url':'{"hello":
{"hi":{"hey":"1","time":"5"}},
{"reg":{"hey":"1","time":"1"}},
{"install":{"hey":"0"}}},
"task":"1","retry":"00",
"max":"5","call":"140"'});
In my db when i click the map<text,text> column, it gets stored as :
{\"hello\":\r\n
{\"subscription_atrisk\":{\"hey\":\"1\",\"time\":\"100\"}},
{\"reg\":{\"hey\":\"1\",\"time\":\"2000\"}},
\"task\":\"0\",\"retry\":\"300\",\"max\":\"5\",\"call\":\"14400\"}
in my c# code, i try
string s = "{\"hello\":\r\n {\"subscription_atrisk\":{\"hey\":\"1\",\"time\":\"100\"}},{\"reg\":{\"hey\":\"1\",\"time\":\"2000\"}},\"task\":\"0\",\"retry\":\"300\",\"max\":\"5\",\"call\":\"14400\"";
Jobject json = Jobject.Parse(s); //Get an Error here.
Could anyone please throw some light on this ?

In JSON, an object should contain a key and either a value or another object/array.
You have syntax errors in your JSON object. First of all, always use double quotes.
Then... The url object has a key Hello but then where you are supposed to place two more keys, you're just putting there two more objects, as if it was an array.
This could be a correct syntax:
{
"url": {
"hello": {
"hi": {
"hey": "1",
"time": "5"
}
},
"MissingKey1":{
"reg": {
"hey": "1",
"time": "1"
}
},
"MissingKey2":{
"install": {
"hey": "0"
}
}
},
"task": "1",
"retry": "00",
"max": "5",
"call": "140"
}
Or if you really meant to have a hello object and an array of two more objects inside url:
{
"url": {
"hello": {
"hi": {
"hey": "1",
"time": "5"
}
},
"AnArray": [{
"reg": {
"hey": "1",
"time": "1"
}
}, {
"install": {
"hey": "0"
}
}]
},
"task": "1",
"retry": "00",
"max": "5",
"call": "140"
}
I suggest that before you store those JSON objects in the database, ALWAYS validate them to make sure that they're valid of syntax.
Or even better: this Newtonsoft library provides functions which serializes(creates) JSON strings from other objects. See JsonConvert.SerializeObject Method
In general it is a good idea to look around in the API documentation, it really can save you a lot of time so that you don't have to do unnecessary work.

Looks like you're missing a closing }
Try:
string s = "{\"hello\": {\"subscription_atrisk\":{\"hey\":\"1\",\"time\":\"100\"}}, \"missing_key\": {\"reg\":{\"hey\":\"1\",\"time\":\"2000\"}},\"task\":\"0\",\"retry\":\"300\",\"max\":\"5\",\"call\":\"14400\"}";

Deserialize Facebook Json result in C#

I'm getting the following Json format string as a result from a Facebook graph search request :
{
"data": [
{
"name": "Event A",
"start_time": "2013-11-08T19:00:00+0200",
"end_time": "2013-11-10T00:00:00+0200",
"timezone": "Europe/Bucharest",
"id": "232252355126"
},
{
"name": "Event B",
"start_time": "2013-11-08T13:00:00+0200",
"end_time": "2013-11-09T16:00:00+0200",
"timezone": "Europe/Bucharest",
"location": "Bucharest",
"id": "414334343426"
},
{
"name": "Event C",
"start_time": "2013-10-30T18:30:00+0200",
"timezone": "Europe/Bucharest",
"location": "Bucharest",
"id": "44315995273"
}
],
"paging": {
"previous": "https://graph.facebook.com/search?limit=3&type=event&q=Bucharest&since=1383930000&__paging_token=22251255126",
"next": "https://graph.facebook.com/search?limit=3&type=event&q=Bucharest&until=1383150600&__paging_token=44115995273"
}
}
I'm encountering some errors while trying to retrieve data from this JSON. I've tried with
dynamic jsonData = await facebookClient.GetTaskAsync(string.Format("https://graph.facebook.com/search?q={0}&type=event&limit={1}&offset={2}", locationKeyword, limit, offset));
dynamic result = JsonConvert.DeserializeObject(jsonData.ToString());
Some answers direct me to use JavaScriptSerializer but I don't have the namespace for that class, as I'm using API for developing Windows 8 Apps.
I can't manage how to get the events as somehow from data object.
I tried accessing the values in the immediate windows in VS as result.data but it's not working.
I search on how to make this but most answers seem to say to create a class in which the json data will fit.
Can't I achieve this with dynamic? (something like result.data.name, result.paging.previous etc)

I have done this exact thing before, except I converted into an XML, My Example:
(1 - JavaScript) var finalStr = JSON.stringify(facebookString)
(2 - ASP.NET) JsonConvert.DeserializeXmlNode("{\"root\":" + received_json + "}","root");

I managed at last to access the members...
To access name for example, or start_time, I did the following :
dynamic jsonData = await facebookClient.GetTaskAsync(string.Format("https://graph.facebook.com/search?q={0}&type=event&limit={1}&offset={2}", locationKeyword, limit, offset));
var result = JObject.Parse(jsonData.ToString());
var array = new JArray(result["data"]);
var a = array[0];
string name = (string) a.SelectToken("name");
var date = (DateTime?) a.SelectToken("start_time");
There might be better implementations but this one worked in my case. I posted it, in case it might be of help to others seeing this post.
Best wishes.