unity c# - how to get values of list<object>

Question

I have this json:

[
  [
    [
      "Tel Aviv",
      "Beersheba",
      "Jerusalem",
      "Haifa"
    ]
  ],
  [
    {
      "City": "Tel Aviv"
    },
    {
      "City": "Beersheba"
    },
    {
      "City": "Jerusalem"
    },
    {
      "City": "Haifa"
    },
    {
      "City": "Jerusalem"
    },
    {
      "City": "Tel Aviv"
    },
    {
      "City": "Haifa"
    },
    {
      "City": "Beersheba"
    },
    {
      "City": "Jerusalem"
    },
    {
      "City": "Jerusalem"
    },
    {
      "City": "Haifa"
    },
    {
      "City": "Tel Aviv"
    },
    {
      "City": "Tel Aviv"
    },
    {
      "City": "Beersheba"
    }
  ]
]

And i converted it to a List:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Newtonsoft;
string jsonStr = "<json string from above>";
List<object> data;
private void Start()
{
    data = Newtonsoft.Json.JsonConvert.DeserializeObject<List<object>>(jsonStr);
    Debug.Log(data[0,0]);
}

But when the dubugger got to "Debug.Log(data[0,0]);" it printed:

Severity Code Description Project File Line Suppression State Error CS0021 Cannot apply indexing with [] to an expression of type 'object' Assembly-CSharp C:\Users\cdi2\Downloads\mdClone-20180627T083334Z-001\mdClone\Assets\CreateTable.cs 31 Active

And what do you expect it to print?

Steve
– Steve

2018-07-01 09:01:15 +00:00
Commented Jul 1, 2018 at 9:01 — Steve
– Steve, Commented Jul 1, 2018 at 9:01
the first value: "Tel Aviv"

raz erez
– raz erez

2018-07-01 09:08:48 +00:00
Commented Jul 1, 2018 at 9:08 — raz erez
– raz erez, Commented Jul 1, 2018 at 9:08

Steve · Accepted Answer · 2018-07-01 09:13:19Z

2

Your string is deserialized in a List<object> A list can be indexed with only one dimension.
So the deserialization creates only two objects of type JArray.
The first one is the group of four cities and the second one is an array of 14 cities.

You can get the first element of the first object with

Console.WriteLine((data[0] as JArray)[0][0]);

While, if you want to reach any of the elements in the second JArray you can use this syntax

Console.WriteLine((data[1] as JArray)[1]["City"]);   // Beersheba

answered Jul 1, 2018 at 9:13

Steve

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