Recently I've gotten into JSON parsing, and I was wondering, is it at all possible to completely dynamically load all of the contents within a JSON file? And by dynamically load, I mean, load all values of a JSON file without knowing any keys, meaning I cannot do the following code:
string contents = File.ReadAllText("SomeJsonFile.txt");
JObject obj = JObject.Parse(contents);
var value = obj["SomeKey"];
The reason I cannot do the code above, is because that would require the application to know the key ahead of time.
My goal is to be able to load any JSON file, and retrieve all values from said JSON file. I want to be able to load nested values, along with root values, all without knowing the keys.
Is there a way for me to do this? If you need any more information, please don't hesitate to ask.
The way I want to use this data is to first, bind a textbox to a string version of each key. Then I will dynamically add the TextBoxes to a FlowLayoutPanel, I also want the user to be able to change this data, and the JSON to change with it.
Please help.
If you don't know what the keys you are going to have you can use JArray from Json.NET to dynamically access the class.
See example instantiation and usage in the answer here:
How to access elements of a JArray (or iterate over them)
Assuming the JSON is an object and not an array, you could deserialize the json string to a IDictionary<string, object> using Json.NET
string myJsonString = File.ReadAllText("SomeJsonFile.txt");
var dataObj = JsonConvert.DeserializeObject<IDictionary<string, object>>(myJsonString);
var topLevelKeys = dataObj.Keys;
Your original question already shows you've successfully parsed a JSON string into a C# object, without knowing the keys.
It appears your actual question is on how to flatten the JObject into some kind of enumerable set of key/value pairs. For that, I refer you to the answers on this thread:
Generically Flatten Json using c#
Answer 2 IMO looks a lot cleaner:
string contents = File.ReadAllText("SomeJsonFile.txt");
var schemaObject = JObject.Parse(contents);
var values = schemaObject
.SelectTokens("$..*")
.Where(t => !t.HasValues)
.ToDictionary(t => t.Path, t => t.ToString());
Related
I have the next issue: I receive a lot of JSONs in different formats. I need to process only part of these documents. I tried to use Newtonsoft.Json.Schema nuget, but got the next problem:
JSON how to don't parse additional properties
Can you suggest me some ways to parse only part of the JSON document, when we don't know structure of this json? We can store some schema of the document.
Example:
We have the next JSON document.
And here we need to process, for example, only name and age properties. And I will know these properties only in runtime.
{
'name': 'James',
'age': 29,
'salary': 9000.01,
'jobTitle': 'Junior Vice President'
}
If your json does not contain nested fields, so each of the top level fields are primitive types (not objects) then you can deserialize it as Dictionary<string, object> like this:
var fieldValueMap = JsonConvert.DeserializeObject<Dictionary<string, object>>(json);
string fieldName = "name";
Console.WriteLine(fieldValueMap.ContainsKey(fieldName)
? fieldValueMap[fieldName]
: "There is no such field");
In my Xamarin.Forms app I use a socket.IO library that fetches data from a Node.js server but I don‘t know about extracting the data from my result. The example method looks like this:
socket.On("event", (data) =>
{
Console.WriteLine(data);
});
When the result is a simple string, I can directly use it as in the console function above.
But how do I extract the data when the result is a unknown datatype that contains multiple information, like this?
let send = {'firstString': string1, 'secondString': string2}
I guess a way could be to make the result a JSON object and read it out by it‘s keys but I don‘t know if that’s a good way and how this would be done.
use Json.Net to parse the json
JObject obj = JObject.Parse(data);
var first = obj["firstString"].Value;
var second = obj["secondString"].Value;
in a task that i'm doing to make a report using information from a JSON string, in my learning of C# language, I have to do the following:
Transform the JSON string into object (done).
Create a list adding all objects (done).
Get a specific value from every object of the (pending).
So, for example, this is what i got so far
string json = #"{
'Name': 'Main Bank',
'Register_Date': '2018-4-7',
'CEO': 'John Peterson}";
Bank bank = JsonConvert.DeserializeObject<Bank>(json);
List<Bank> bank_list = new List<Bank>();
bank_list.add(bank);
//adding many Bank object to the list
/*what I need here is to get every 'Register_Date' from every object,
using for each i presume, I don't have this part clear*/
I'm open to your suggestions to finish my process, I hope you can give a hand with. Thank you so much for your time and attention.
Just use a Select
var dates = bank_list.Select(x => x.Register_Date).ToList();
var details= _clientService.GetAsync<DoctorDetails>(getDetails).Result;
I get the Result from the service which is JSON when I use "object" in the GetAsync instead of DoctorDetails. However, I don't see any property values being filled in details (All are null in DoctorDetails). DoctorDetails is the cs file of the schema I generated through xsd.
DoctorDetails is an auto generated file that contains properties like
Name
ID etc
How to deserialize this and get values in those properties (in the details variable above)
Edit
It is only returning values if I make the syntax like this
var details= _clientService.GetAsync<object>(getDetails).Result;
If you haven't already tried this option, use a library called Json.Net from Newtonsoft for json stuff. Newtonsoft json.
Provided you have the schema details and the property names match you may try the following..
var details= _clientService.GetAsync<object>(getDetails).Result;//Please check if this is a string else use .ToString()
/*
"{
'Name': 'Doctor Who',
'ID' : '1001'
}";
*/
DoctorDetails m = JsonConvert.DeserializeObject<DoctorDetails>(details);
Documentation Deserialize an Object.
I'm not promoting this library, it's just a suggestion. :)
Hope it helps.
I'm trying to define aoColumns using ajax and a C# webmethod. I am treating it very similarly to how I am passing in server-side data, using a List> data structure that I add rows of List to. My problem is that this results in a string like:
{\"aoColumns\":[[\"\\\"bVisible\\\": False\"],[\"\\\"bVisible\\\": True\"],[\"\\\"bVisible\\\": True\"],[\"\\\"bVisible\\\": True\"],[\"\\\"bVisible\\\": True\"],[\"\\\"bVisible\\\": True\"],[\"\\\"bVisible\\\": True\"],[\"\\\"bVisible\\\": True\"]]}
Which is nearly correct, except that the column definitions are using square brackets instead of {}. How would I go about generating the correct JSON text? Any help is greatly appreciated!
I am assuming you are using data tables from http://www.datatables.net/. Please correct me if I am wrong.
I am not sure I understand if you are having trouble creating the JSON string to return to the AJAX call or converting it into something usable on the server-side.
If you are going to create a JSON string in a web method, I would suggest using a Dictionary type, since they are so close to JSON strings. To convert a Dictionary type into a JSON string, use this:
var dictionary = new Dictionary<string, string>()
// add values here...
return new JavaScriptSerializer().Serialize(dictionary);
If you are converting a JSON string into a Dictionary object, use this:
var dictionary = new JavaScriptSerializer().Deserialize<Dictionary<string, string>>(jsonString);
Another thing I like to do is convert the dictionary into an array if I am going to be working with any keys or values since getting them from the dictionary can be a pain when you do not know the exact key value you want to work with.
For reference, the JavaScriptSerializer is part of the System.Web.Script.Serialization.JavaScriptSerializer namespace and in the System.Web.Extensions assembly.