C# reading out json list containing objects

Question

I'm trying to get an array out of some JSON code.
Which I get from here: JSON code source

I have this, but I have no idea how to make the output usable.

        //Some other code above this line
        var jsonout = new JavaScriptSerializer().Deserialize<List<Rootobject>>(json);

    }
}

//JSON structure
public class Rootobject
{
    public Class1[] Property1 { get; set; }
}

public class Class1
{
    public string group { get; set; }
    public string tracker { get; set; }
    public string measureTime { get; set; }
    public int minAgo { get; set; }
    public float lat { get; set; }
    public float lon { get; set; }
    public History[] history { get; set; }
}

public class History
{
    public float lat { get; set; }
    public float lon { get; set; }
    public int minAgo { get; set; }
}

I have no idea how to to get the lat, lon, measureTime, etc.. from the output. Do you guys a nice way on how to do it? (I'm very new with using JSON in C#).

Do you have to use JavaScriptSerializer rather than (say) Json.NET? What does your current code actually do? (It looks like you should be deserializing a List<Class1>, not a List<Rootobject>.) — Jon Skeet
– Jon Skeet, Commented Aug 17, 2017 at 18:11
Your data model is wrong -- the extra level Class1 is unnecessary. Post your JSON to json2csharp.com and you can get a corrected data model, where RootObject has the properties from Class1. — dbc
– dbc, Commented Aug 17, 2017 at 18:14

dbc · Accepted Answer · 2017-08-17 18:25:34Z

Your data model is wrong -- the extra level Class1 is unnecessary. Post your JSON to http://json2csharp.com/ and you can get a corrected data model, where RootObject has the properties from Class1:

public class History
{
    public double lat { get; set; }
    public double lon { get; set; }
    public int minAgo { get; set; }
}

public class RootObject
{
    public string group { get; set; }
    public string tracker { get; set; }
    public string measureTime { get; set; }
    public int minAgo { get; set; }
    public double lat { get; set; }
    public double lon { get; set; }
    public List<History> history { get; set; }
}

And then do:

var jsonout = new JavaScriptSerializer().Deserialize<List<RootObject>>(json);
foreach (var root in jsonout)
{
    Console.WriteLine(root.measureTime); // For instance.
    Console.WriteLine(root.lat); // For instance.
    Console.WriteLine(root.lon); // For instance.
}

Craig W. · Accepted Answer · 2017-08-17 18:14:57Z

0

You're deserializing the wrong type. You don't have a collection of Rootobject, you have a single Rootobject that contains a collection of Class1.

var jsonout = new JavaScriptSerializer().Deserialize<Rootobject>(json);

At that point just use object notation.

foreach(var thing in jsonout.Property1)
{
    thing.lat;
    thing.lon;
}

answered Aug 17, 2017 at 18:14

Craig W.

18.2k6 gold badges52 silver badges83 bronze badges

Comments

eduardomx89 · Accepted Answer · 2017-08-17 18:33:46Z

You can declare your general classes like this

public class Class1
{
    public string group { get; set; }
    public string tracker { get; set; }
    public string measureTime { get; set; }
    public int minAgo { get; set; }
    public float lat { get; set; }
    public float lon { get; set; }
    public List<History> history { get; set; }

    public List<History> GetListHistories(){
      return history;
    }
}

public class History
{
    public float lat { get; set; }
    public float lon { get; set; }
    public int minAgo { get; set; }
}

And implementation like this

var jsonout = new JavaScriptSerializer().Deserialize<List<Class1>>(json);
foreach(var item in jsonout)
{
  console.Write(item.gruop);
  console.Write(item.tracker);
  // more properties
  // and:
  List<History> list = item.GetListHistories();
  foreach(var l in list)
  {
     console.Write(l.lat);
     console.Write(l.lon);
  }
}

Collectives™ on Stack Overflow

C# reading out json list containing objects

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related