Parsing json objects

Question

I'm having trouble understanding how to parse JSON string into c# objects with Visual .NET. The task is very easy, but I'm still lost... I get this string:

{"single_token":"842269070","username":"example123","version":1.1}

And this is the code where I try to desterilize:

namespace _SampleProject
{
    public partial class Downloader : Form
    {
        public Downloader(string url, bool showTags = false)
        {
            InitializeComponent();
            WebClient client = new WebClient();
            string jsonURL = "http://localhost/jev";   
            source = client.DownloadString(jsonURL);
            richTextBox1.Text = source;
            JavaScriptSerializer parser = new JavaScriptSerializer();
            parser.Deserialize<???>(source);
        }

I don't know what to put between the '<' and '>', and from what I've read online I have to create a new class for it..? Also, how do I get the output? An example would be helpful!

BTW, the JSON is most likely wrong. I doubt `version` is supposed to be a number. — svick, May 03 '12 at 13:48

score 9 · Accepted Answer · answered May 03 '12 at 13:49

Create a new class that your JSON can be deserialized into such as:

public class UserInfo
{
    public string single_token { get; set; }
    public string username { get; set; }
    public string version { get; set; }
}

public partial class Downloader : Form
{
    public Downloader(string url, bool showTags = false)
    {
        InitializeComponent();
        WebClient client = new WebClient();
        string jsonURL = "http://localhost/jev";
        source = client.DownloadString(jsonURL);
        richTextBox1.Text = source;
        JavaScriptSerializer parser = new JavaScriptSerializer();
        var info = parser.Deserialize<UserInfo>(source);

        // use deserialized info object
    }
}

marko · Answer 2 · 2012-05-03T14:06:48.540

7

If you're using .NET 4 - use the dynamic datatype.

http://msdn.microsoft.com/en-us/library/dd264736.aspx

string json = "{ single_token:'842269070', username: 'example123', version:1.1}";

     JavaScriptSerializer jss = new JavaScriptSerializer();

     dynamic obj = jss.Deserialize<dynamic>(json);

     Response.Write(obj["single_token"]);
     Response.Write(obj["username"]);
     Response.Write(obj["version"]);

edited May 03 '12 at 14:06

answered May 03 '12 at 13:47

marko

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Could you explain how exactly could that type be used here? Because `Deserialize(source)` won't have the desired effect. – svick May 03 '12 at 13:50
@svick He wouldn't be able to use Deserialize. He would probably have to do something like what is discussed here http://stackoverflow.com/questions/3142495/deserialize-json-into-c-sharp-dynamic-object. He wouldn't have to create a strongly typed class in that case and just use the dynamic object like: var dynObject = parser.Deserialize(source, typeof(object); Then access the properties dynamically. dynObject.single_token, dynObject.username, etc. – jaryd May 03 '12 at 13:57

score 2 · Answer 3 · answered May 03 '12 at 13:43

2

Yes, you need a new class with properties that will match your JSON.

MyNewClass result = parser.Deserialize<MyNewClass>(source);

answered May 03 '12 at 13:43

Jakub Konecki

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score 2 · Answer 4 · answered May 03 '12 at 13:54

The usual way would be create a class (or a set of classes, for more complex JSON strings) that describes the object you want to deserialize and use that as the generic parameter.

Another option is to deserialize the JSON into a Dictionary<string, object>:

parser.Deserialize<Dictionary<string, object>>(source);

This way, you can access the data, but I wouldn't suggest you to do this unless you have to.

score 1 · Answer 5 · answered May 03 '12 at 13:44

1

You need a Class that match with the JSON you are getting and it will return a new object of that class with the values populated.

answered May 03 '12 at 13:44

Eduardo Crimi

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score 0 · Answer 6 · answered Sep 12 '16 at 12:22

Following is the code..

ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications);

        request = WebRequest.Create("https://myipaddress/api/admin/configuration/v1/conference/1/");

        request.Credentials = new NetworkCredential("admin", "admin123");
        // Create POST data and convert it to a byte array.
        request.Method = "GET";          

                // Set the ContentType property of the WebRequest.
        request.ContentType = "application/json; charset=utf-8";          


        WebResponse response = request.GetResponse();
        // Display the status.
        Console.WriteLine(((HttpWebResponse)response).StatusDescription);
        // Get the stream containing content returned by the server.
        dataStream = response.GetResponseStream();
        // Open the stream using a StreamReader for easy access.
        StreamReader reader = new StreamReader(dataStream);
        // Read the content.
        string responseFromServer = reader.ReadToEnd();
        JavaScriptSerializer js = new JavaScriptSerializer();
        var obj = js.Deserialize<dynamic>(responseFromServer);
        Label1.Text = obj["name"];
        // Display the content.
        Console.WriteLine(responseFromServer);
        // Clean up the streams.
        reader.Close();
        dataStream.Close();
        response.Close();

score 0 · Answer 7 · answered May 10 '18 at 23:27

0

dynamic data = JObject.Parse(jsString);
var value= data["value"];

answered May 10 '18 at 23:27

I Stand With Russia

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Parsing json objects

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