c# JSON Directly Nested Arrays

Question

I'm hitting a RESTful api and trying to process the returned data. The data itself consists of json arrays within arrays.

{
  "category1": [
    [
      "http://url1",
      "URL 1 Title"
    ],
    [
      "http://url2",
      "URL 2 Title"
    ]
  ],
  "category2": [
    [
      "http://url3",
      "URL 3 Title"
    ]
  ],
  "category3": [
    [
      "http://url4",
      "URL 4 Title"
    ]
  ]
}

I've created a class that maps to the content above, but I have no idea of how to parse the result and extract the individual URL and URL Titles.

I can see how I might do it if these were objects, but no idea on how to access directly nested arrays.

You could do: var objectOfYourClass = JsonConvert.DeserializeObject<YourClass>(jsonString) — Cicero
– Cicero, Commented Mar 24, 2017 at 17:31
The result of that JSON will be an object with three properties and not an array with three objects. — dcg
– dcg, Commented Mar 24, 2017 at 17:31

tRuEsAtM · Accepted Answer · 2017-03-24 18:37:10Z

1

Try this

class Output
{
     public string[][] category1 { get; set; }
     public string[][] category2 { get; set; }
     public string[][] category3 { get; set; }
}

class OutputCategory
{
     public string uri { get; set; }
     public string label { get; set; }
}

I have modified your code in the main() method to the following one.

 string samplejson =
            @"{'category1':[['http://url1','URL 1 Title'],['http://url2','URL 2 Title']],'category2':[['http://url3','URL 3 Title']],'category3':[['http://url4','URL 4 Title']]}";

        //deserialised to my class object
        var result = JsonConvert.DeserializeObject<Output>(samplejson);

        //create new output object
        Output outCat = new Output();

        //I now want to assign the appropriate values to my new output object

        Console.WriteLine(result.category2.Length);
        Console.WriteLine("URL: " + result.category1[0][0]);
        Console.WriteLine("Title: " + result.category1[0][1]);

Make sure you check the length of the array and then proceed with your result.

edited Mar 24, 2017 at 18:37

answered Mar 24, 2017 at 17:36

tRuEsAtM

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2 Comments

alteraki Over a year ago

Many Thanks for the help!

NovaDev Over a year ago

+1 for a good example of how to access a more deeply nested array. Most of the examples start with an array or an object and leave it at that.

Zinov · Accepted Answer · 2017-03-24 17:41:23Z

0

I am using this in my codes, after you have YourModel class created then you can use the bellow approach

 JsonConvert.DeserializeObject<YourModel>(content,
                                        new JsonSerializerSettings
                                        {
                                           ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                                        });

answered Mar 24, 2017 at 17:41

Zinov

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Comments

Christian Gollhardt · Accepted Answer · 2017-03-24 17:54:36Z

0

You want to have jagged arrays:

public class Model
{
    public string[][] category1 { get; set; }
    public string[][] category2 { get; set; }
    public string[][] category3 { get; set; }
}

And then:

var model = JsonConvert.DeserializeObject<Model>(json);

foreach (var element in model.category1)
{
    var url = element[0];
    var title = element[1];
}

edited Mar 24, 2017 at 17:54

answered Mar 24, 2017 at 17:49

Christian Gollhardt

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