How to get value from JSON objects in C#?

Question

I've tried to get the values from the JSON object that I made a request from Google APIs. My goal is to get the data from transcript.

This is the JSON file.

{
 "results": [
 {
 "alternatives": [
 {
 "transcript": "how old are you",
 "confidence": 0.66882694
 }
 ]
 }
 ]
}

And I've tried to get the output by using this. But it doesn't work.

var result = ["result"][0]["alternative"][0]["transcript"].ToString()

When I query the data, It doesn't show anything, just empty string.

• D-Shih: Your key can't match with your json.
• Peter Smith: Where are you storing your JSON object. You need to work on that object. Have you Googled "parsing a JSON string in C#"
• Peter Smith: Look at this

Answer 1

Convert your JSON to a class

Json2CSharp and you get:

public class Alternative
{
 public string transcript { get; set; }
 public double confidence { get; set; }
}
public class Result
{
 public List<Alternative> alternatives { get; set; }
}
public class RootObject
{
 public List<Result> results { get; set; }
}

Store it somewhere in your code.

Use Newtonsoft.Json package

Install Newtonsoft.Json NUGet Package in your solution and import it in your code:

using Newtonsoft.Json;

Now you can deserialize your json as you prefer as long as you have it in a string variable.

var yourObject = JsonConvert.DeserializeObject<RootObject>(jsonString);

You may access your transcript value using:

var transcript = yourObject.results[0].alternatives[0].transcript;

Answer 2

SOLUTION (without using external library like NewtonSoft.Json):

• Add reference System.Web.Extensions.
• use an assembly System.Web.Script.Serialization;

CODE:

var jsonString = "{\"results\": [ {\"alternatives\": [ {\"transcript\": \"how old are you\", \"confidence\": 0.66882694 } ] } ]}";
var jsonDeserialized = serializer.Deserialize<dynamic> (jsonString);
Console.WriteLine (jsonDeserialized["results"][0]["alternatives"][0]["transcript"]); // Prints "how old are you"

Answer 3

Your strings are JSON formatted, so you will need to parse it into a object. For that you can use JSON.NET.

Here is an example on how to parse a JSON string into a dynamic object:

string source = "{\r\n \"id\": \"100000280905615\", \r\n \"name\": \"Jerard Jones\", \r\n \"first_name\": \"Jerard\", \r\n \"last_name\": \"Jones\", \r\n \"link\": \"https://www.facebook.com/Jerard.Jones\", \r\n \"username\": \"Jerard.Jones\", \r\n \"gender\": \"female\", \r\n \"locale\": \"en_US\"\r\n}";
dynamic data = JObject.Parse(source);
Console.WriteLine(data.id);
.

Console which data you want show

Answer 4

Usually if I knew what the structure of the JSON looks like I would use class to parse it.

But you could always parse the string to JSON object anytime.

using Newtonsoft.Json.Linq;
var json=JObject.Parse(YOUR_JSON_STRING)
var result = json["results"][0]["alternative"][0]["transcript"].ToString()

https://dotnetfiddle.net/KSDcIP

Also your keys that you are requesting doesn't match the keys in the JSON