Deserialization of complex (nested) JSON to C# objects

Your json is not syntactically correct (https://jsonlint.com/) and from what I see it doesn't contain a List of ModelClass.Rootobject but just and object of this class. Try the following

    static void Main()
{
    string json2 = @"{'code':200,'message':'OK','profiling':null,'count':6,'skip':0,'limit':50,'next_page':null,'previous_page':null,'additional_meta':{'$and':[{'deleted':false},{'$or':[{'holder_id':{'$id':'5543677f37c6b65f008b46e4'}},{'root.holder._id':{'$id':'5543677f37c6b65f008b46e4'}}]}]},'data':[{'_id':'5825c6f6de22ae00632e86f3','ean':'659842','name':null,'holder':{'_id':'5543677f37c6b65f008b46e4','name':'Example account','username':'[email protected]'},'root':{'_id':'5824790e3d214b006271c515','holder':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','entity_type':'utility_provider'}},'assigner':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','username':'[email protected]','manager':{'_id':null}},'created':'2016-11-11T13:26:14+0000','children':[],'address':'Kungsgatan 2','timezone':'Etc\/GMT-1','control_level':'shared','billing_category':'owned_meter_consumption','generation':1,'tags':[],'box':'active','revoked':false,'metrics':['energy'],'type':'heat','consumption_stats':{'energy':{'hour':{'count':26275,'sum':6546140,'max':930,'last':2016123021,'min':0,'first':2014010101},'day':{'count':1091,'sum':6522120,'max':18900,'last':20161229,'min':1180,'first':20140102},'month':{'count':33,'sum':5727310,'max':387190,'last':201708,'min':49750,'first':201402}}},'cost_stats':{},'readings_stats':null,'has_active_complaints':false,'representation':null,'open_channel_ids':null,'on_hold':null,'last_sla_comment':null,'location':null,'meta_data':{},'meter_readers':[],'collection_window':5,'memo':null},{'_id':'5825c76920fe9b006308e412','ean':'735999999564879216','name':null,'holder':{'_id':'5543677f37c6b65f008b46e4','name':'Example account','username':'[email protected]'},'root':{'_id':'5824790e3d214b006271c510','holder':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','entity_type':'utility_provider'}},'assigner':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','username':'[email protected]','manager':{'_id':null}},'created':'2016-11-11T13:28:09+0000','children':[],'address':'Kungsgatan 2','timezone':'Etc\/GMT-1','control_level':'shared','billing_category':'owned_meter_consumption','generation':1,'tags':[],'box':'active','revoked':false,'metrics':['energy'],'type':'electricity','consumption_stats':{'energy':{'hour':{'count':25953,'sum':311714.628,'max':34.3,'last':2016121709,'min':0,'first':2014010101},'day':{'count':1080,'sum':311302.328,'max':689,'last':20161216,'min':141.1,'first':20140102},'month':{'count':35,'sum':306915.54,'max':13704.72,'last':201708,'min':6013.932,'first':201402}}},'cost_stats':{},'readings_stats':null,'has_active_complaints':false,'representation':null,'open_channel_ids':null,'on_hold':null,'last_sla_comment':null,'location':null,'meta_data':{},'meter_readers':[],'collection_window':5,'memo':null},{'_id':'5825c84b22c8aa00623d65a5','ean':'6934363','name':null,'holder':{'_id':'5543677f37c6b65f008b46e4','name':'Example account','username':'[email protected]'},'root':{'_id':'577fdd960c8a335c008b4672','holder':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','entity_type':'utility_provider'}},'assigner':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','username':'[email protected]','manager':{'_id':null}},'created':'2016-11-11T13:31:55+0000','children':[],'address':'Gr\u00e4nsv\u00e4gen 12B','timezone':'Etc\/GMT-1','control_level':'shared','billing_category':'owned_meter_consumption','generation':1,'tags':[],'box':'active','revoked':false,'metrics':['energy'],'type':'gas','consumption_stats':{'energy':{'month':{'count':24,'sum':42656.62,'max':8890.65,'last':201708,'min':104.57,'first':201501},'hour':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0},'day':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0}}},'cost_stats':{},'readings_stats':null,'has_active_complaints':false,'representation':null,'open_channel_ids':null,'on_hold':null,'last_sla_comment':null,'location':null,'meta_data':{},'meter_readers':[],'collection_window':5,'memo':null},{'_id':'5825c85320fe9b006308e41d','ean':'5896584','name':null,'holder':{'_id':'5543677f37c6b65f008b46e4','name':'Example account','username':'[email protected]'},'root':{'_id':'577fdd960c8a335c008b466c','holder':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','entity_type':'utility_provider'}},'assigner':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','username':'[email protected]','manager':{'_id':null}},'created':'2016-11-11T13:32:03+0000','children':[],'address':'Gr\u00e4nsv\u00e4gen 12B','timezone':'Etc\/GMT-1','control_level':'shared','billing_category':'owned_meter_consumption','generation':1,'tags':[],'box':'active','revoked':false,'metrics':['energy'],'type':'heat','consumption_stats':{'energy':{'month':{'count':57,'sum':3592320,'max':173000,'last':201709,'min':2000,'first':201301},'hour':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0},'day':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0}}},'cost_stats':{},'readings_stats':null,'has_active_complaints':false,'representation':null,'open_channel_ids':null,'on_hold':null,'last_sla_comment':null,'location':null,'meta_data':{},'meter_readers':[],'collection_window':5,'memo':null},{'_id':'5825c85920fe9b0061547253','ean':'735999666123123123','name':null,'holder':{'_id':'5543677f37c6b65f008b46e4','name':'Example account','username':'[email protected]'},'root':{'_id':'577fdd960c8a335c008b4669','holder':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','entity_type':'utility_provider'}},'assigner':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','username':'[email protected]','manager':{'_id':null}},'created':'2016-11-11T13:32:09+0000','children':[],'address':'Gr\u00e4nsv\u00e4gen 12B','timezone':'Etc\/GMT-1','control_level':'shared','billing_category':'owned_meter_consumption','generation':1,'tags':[],'box':'active','revoked':false,'metrics':['energy'],'type':'electricity','consumption_stats':{'energy':{'month':{'count':45,'sum':141604.36,'max':6488.2,'last':201709,'min':1759.64,'first':201401},'hour':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0},'day':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0}}},'cost_stats':{},'readings_stats':null,'has_active_complaints':false,'representation':null,'open_channel_ids':null,'on_hold':null,'last_sla_comment':null,'location':null,'meta_data':{},'meter_readers':[],'collection_window':5,'memo':null},{'_id':'5825c85d22c8aa00606b9dd5','ean':'1200004','name':null,'holder':{'_id':'5543677f37c6b65f008b46e4','name':'Example account','username':'[email protected]'},'root':{'_id':'577fdd960c8a335c008b466f','holder':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','entity_type':'utility_provider'}},'assigner':{'_id':'577fd0170c8a335c008b45fe','name':'Rob Harvey Utility Company','username':'[email protected]','manager':{'_id':null}},'created':'2016-11-11T13:32:13+0000','children':[],'address':'Gr\u00e4nsv\u00e4gen 12B','timezone':'Etc\/GMT-1','control_level':'shared','billing_category':'owned_meter_consumption','generation':1,'tags':[],'box':'active','revoked':false,'metrics':['energy'],'type':'cooling','consumption_stats':{'energy':{'month':{'count':33,'sum':902350,'max':92560,'last':201709,'min':9730,'first':201501},'hour':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0},'day':{'first':null,'last':null,'sum':null,'max':null,'min':null,'count':0}}},'cost_stats':{},'readings_stats':null,'has_active_complaints':false,'representation':null,'open_channel_ids':null,'on_hold':null,'last_sla_comment':null,'location':null,'meta_data':{},'meter_readers':[],'collection_window':5,'memo':null}]}";

    var items = JsonConvert.DeserializeObject<ModelsClass.Rootobject>(json2);
     foreach (ModelsClass.Rootobject value in items)
     {
         Console.WriteLine(value, items);
     }
    Console.ReadKey();
}

Get the all the type & properties from your class Something like below

Dictionary<string, string> myDict = new Dictionary<string, string>();
Type t = data.GetType();

    foreach (PropertyInfo pi in t.GetProperties())
    {
        myDict[pi.Name] = pi.GetValue(data,null).ToString();   
    }

(Made a separate post about this because of limit in characters)

If you want to see the formatted JSON example response, it is down below:

    {  
   "code":200,
   "message":"OK",
   "profiling":null,
   "count":6,
   "skip":0,
   "limit":50,
   "next_page":null,
   "previous_page":null,
   "additional_meta":{  
      "$and":[  
         {  
            "deleted":false
         },
         {  
            "$or":[  
               {  
                  "holder_id":{  
                     "$id":"5543677f37c6b65f008b46e4"
                  }
               },
               {  
                  "root.holder._id":{  
                     "$id":"5543677f37c6b65f008b46e4"
                  }
               }
            ]
         }
      ]
   },
   "data":[  
      {  
         "_id":"5825c6f6de22ae00632e86f3",
         "ean":"659842",
         "name":null,
         "holder":{  
            "_id":"5543677f37c6b65f008b46e4",
            "name":"Example account",
            "username":"[email protected]"
         },
         "root":{  
            "_id":"5824790e3d214b006271c515",
            "holder":{  
               "_id":"577fd0170c8a335c008b45fe",
               "name":"Rob Harvey Utility Company",
               "entity_type":"utility_provider"
            }
         },
         "assigner":{  
            "_id":"577fd0170c8a335c008b45fe",
            "name":"Rob Harvey Utility Company",
            "username":"[email protected]",
            "manager":{  
               "_id":null
            }
         },
         "created":"2016-11-11T13:26:14+0000",
         "children":[  

         ],
         "address":"Kungsgatan 2",
         "timezone":"Etc\/GMT-1",
         "control_level":"shared",
         "billing_category":"owned_meter_consumption",
         "generation":1,
         "tags":[  

         ],
         "box":"active",
         "revoked":false,
         "metrics":[  
            "energy"
         ],
         "type":"heat",
         "consumption_stats":{  
            "energy":{  
               "hour":{  
                  "count":26275,
                  "sum":6546140,
                  "max":930,
                  "last":2016123021,
                  "min":0,
                  "first":2014010101
               },
               "day":{  
                  "count":1091,
                  "sum":6522120,
                  "max":18900,
                  "last":20161229,
                  "min":1180,
                  "first":20140102
               },
               "month":{  
                  "count":33,
                  "sum":5727310,
                  "max":387190,
                  "last":201708,
                  "min":49750,
                  "first":201402
               }
            }
         },
         "cost_stats":{  

         },
         "readings_stats":null,
         "has_active_complaints":false,
         "representation":null,
         "open_channel_ids":null,
         "on_hold":null,
         "last_sla_comment":null,
         "location":null,
         "meta_data":{  

         },
         "meter_readers":[  

         ],
         "collection_window":5,
         "memo":null
      },
      {  
         "_id":"5825c76920fe9b006308e412",
         "ean":"735999999564879216",
         "name":null,
         "holder":{  
            "_id":"5543677f37c6b65f008b46e4",
            "name":"Example account",
            "username":"[email protected]"
         },
         "root":{  
            "_id":"5824790e3d214b006271c510",
            "holder":{  
               "_id":"577fd0170c8a335c008b45fe",
               "name":"Rob Harvey Utility Company",
               "entity_type":"utility_provider"
            }
         },
         "assigner":{  
            "_id":"577fd0170c8a335c008b45fe",
            "name":"Rob Harvey Utility Company",
            "username":"[email protected]",
            "manager":{  
               "_id":null
            }
         },
         "created":"2016-11-11T13:28:09+0000",
         "children":[  

         ],
         "address":"Kungsgatan 2",
         "timezone":"Etc\/GMT-1",
         "control_level":"shared",
         "billing_category":"owned_meter_consumption",
         "generation":1,
         "tags":[  

         ],
         "box":"active",
         "revoked":false,
         "metrics":[  
            "energy"
         ],
         "type":"electricity",
         "consumption_stats":{  
            "energy":{  
               "hour":{  
                  "count":25953,
                  "sum":311714.628,
                  "max":34.3,
                  "last":2016121709,
                  "min":0,
                  "first":2014010101
               },
               "day":{  
                  "count":1080,
                  "sum":311302.328,
                  "max":689,
                  "last":20161216,
                  "min":141.1,
                  "first":20140102
               },
               "month":{  
                  "count":35,
                  "sum":306915.54,
                  "max":13704.72,
                  "last":201708,
                  "min":6013.932,
                  "first":201402
               }
            }
         },
         "cost_stats":{  

         },
         "readings_stats":null,
         "has_active_complaints":false,
         "representation":null,
         "open_channel_ids":null,
         "on_hold":null,
         "last_sla_comment":null,
         "location":null,
         "meta_data":{  

         },
         "meter_readers":[  

         ],
         "collection_window":5,
         "memo":null
      },
      {  
         "_id":"5825c84b22c8aa00623d65a5",
         "ean":"6934363",
         "name":null,
         "holder":{  
            "_id":"5543677f37c6b65f008b46e4",
            "name":"Example account",
            "username":"[email protected]"
         },
         "root":{  
            "_id":"577fdd960c8a335c008b4672",
            "holder":{  
               "_id":"577fd0170c8a335c008b45fe",
               "name":"Rob Harvey Utility Company",
               "entity_type":"utility_provider"
            }
         },
         "assigner":{  
            "_id":"577fd0170c8a335c008b45fe",
            "name":"Rob Harvey Utility Company",
            "username":"[email protected]",
            "manager":{  
               "_id":null
            }
         },
         "created":"2016-11-11T13:31:55+0000",
         "children":[  

         ],
         "address":"Gr\u00e4nsv\u00e4gen 12B",
         "timezone":"Etc\/GMT-1",
         "control_level":"shared",
         "billing_category":"owned_meter_consumption",
         "generation":1,
         "tags":[  

         ],
         "box":"active",
         "revoked":false,
         "metrics":[  
            "energy"
         ],
         "type":"gas",
         "consumption_stats":{  
            "energy":{  
               "month":{  
                  "count":24,
                  "sum":42656.62,
                  "max":8890.65,
                  "last":201708,
                  "min":104.57,
                  "first":201501
               },
               "hour":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               },
               "day":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               }
            }
         },
         "cost_stats":{  

         },
         "readings_stats":null,
         "has_active_complaints":false,
         "representation":null,
         "open_channel_ids":null,
         "on_hold":null,
         "last_sla_comment":null,
         "location":null,
         "meta_data":{  

         },
         "meter_readers":[  

         ],
         "collection_window":5,
         "memo":null
      },
      {  
         "_id":"5825c85320fe9b006308e41d",
         "ean":"5896584",
         "name":null,
         "holder":{  
            "_id":"5543677f37c6b65f008b46e4",
            "name":"Example account",
            "username":"[email protected]"
         },
         "root":{  
            "_id":"577fdd960c8a335c008b466c",
            "holder":{  
               "_id":"577fd0170c8a335c008b45fe",
               "name":"Rob Harvey Utility Company",
               "entity_type":"utility_provider"
            }
         },
         "assigner":{  
            "_id":"577fd0170c8a335c008b45fe",
            "name":"Rob Harvey Utility Company",
            "username":"[email protected]",
            "manager":{  
               "_id":null
            }
         },
         "created":"2016-11-11T13:32:03+0000",
         "children":[  

         ],
         "address":"Gr\u00e4nsv\u00e4gen 12B",
         "timezone":"Etc\/GMT-1",
         "control_level":"shared",
         "billing_category":"owned_meter_consumption",
         "generation":1,
         "tags":[  

         ],
         "box":"active",
         "revoked":false,
         "metrics":[  
            "energy"
         ],
         "type":"heat",
         "consumption_stats":{  
            "energy":{  
               "month":{  
                  "count":57,
                  "sum":3592320,
                  "max":173000,
                  "last":201709,
                  "min":2000,
                  "first":201301
               },
               "hour":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               },
               "day":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               }
            }
         },
         "cost_stats":{  

         },
         "readings_stats":null,
         "has_active_complaints":false,
         "representation":null,
         "open_channel_ids":null,
         "on_hold":null,
         "last_sla_comment":null,
         "location":null,
         "meta_data":{  

         },
         "meter_readers":[  

         ],
         "collection_window":5,
         "memo":null
      },
      {  
         "_id":"5825c85920fe9b0061547253",
         "ean":"735999666123123123",
         "name":null,
         "holder":{  
            "_id":"5543677f37c6b65f008b46e4",
            "name":"Example account",
            "username":"[email protected]"
         },
         "root":{  
            "_id":"577fdd960c8a335c008b4669",
            "holder":{  
               "_id":"577fd0170c8a335c008b45fe",
               "name":"Rob Harvey Utility Company",
               "entity_type":"utility_provider"
            }
         },
         "assigner":{  
            "_id":"577fd0170c8a335c008b45fe",
            "name":"Rob Harvey Utility Company",
            "username":"[email protected]",
            "manager":{  
               "_id":null
            }
         },
         "created":"2016-11-11T13:32:09+0000",
         "children":[  

         ],
         "address":"Gr\u00e4nsv\u00e4gen 12B",
         "timezone":"Etc\/GMT-1",
         "control_level":"shared",
         "billing_category":"owned_meter_consumption",
         "generation":1,
         "tags":[  

         ],
         "box":"active",
         "revoked":false,
         "metrics":[  
            "energy"
         ],
         "type":"electricity",
         "consumption_stats":{  
            "energy":{  
               "month":{  
                  "count":45,
                  "sum":141604.36,
                  "max":6488.2,
                  "last":201709,
                  "min":1759.64,
                  "first":201401
               },
               "hour":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               },
               "day":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               }
            }
         },
         "cost_stats":{  

         },
         "readings_stats":null,
         "has_active_complaints":false,
         "representation":null,
         "open_channel_ids":null,
         "on_hold":null,
         "last_sla_comment":null,
         "location":null,
         "meta_data":{  

         },
         "meter_readers":[  

         ],
         "collection_window":5,
         "memo":null
      },
      {  
         "_id":"5825c85d22c8aa00606b9dd5",
         "ean":"1200004",
         "name":null,
         "holder":{  
            "_id":"5543677f37c6b65f008b46e4",
            "name":"Example account",
            "username":"[email protected]"
         },
         "root":{  
            "_id":"577fdd960c8a335c008b466f",
            "holder":{  
               "_id":"577fd0170c8a335c008b45fe",
               "name":"Rob Harvey Utility Company",
               "entity_type":"utility_provider"
            }
         },
         "assigner":{  
            "_id":"577fd0170c8a335c008b45fe",
            "name":"Rob Harvey Utility Company",
            "username":"[email protected]",
            "manager":{  
               "_id":null
            }
         },
         "created":"2016-11-11T13:32:13+0000",
         "children":[  

         ],
         "address":"Gr\u00e4nsv\u00e4gen 12B",
         "timezone":"Etc\/GMT-1",
         "control_level":"shared",
         "billing_category":"owned_meter_consumption",
         "generation":1,
         "tags":[  

         ],
         "box":"active",
         "revoked":false,
         "metrics":[  
            "energy"
         ],
         "type":"cooling",
         "consumption_stats":{  
            "energy":{  
               "month":{  
                  "count":33,
                  "sum":902350,
                  "max":92560,
                  "last":201709,
                  "min":9730,
                  "first":201501
               },
               "hour":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               },
               "day":{  
                  "first":null,
                  "last":null,
                  "sum":null,
                  "max":null,
                  "min":null,
                  "count":0
               }
            }
         },
         "cost_stats":{  

         },
         "readings_stats":null,
         "has_active_complaints":false,
         "representation":null,
         "open_channel_ids":null,
         "on_hold":null,
         "last_sla_comment":null,
         "location":null,
         "meta_data":{  

         },
         "meter_readers":[  

         ],
         "collection_window":5,
         "memo":null
      }
   ]
}

I posted a question about flattening a JSON object to key-value pairs last week, the response from Alexander Petrov really helped me out. The question is here. His code will deal with JSON of any structure, so if you change your inbound object, the code will still dump it out. Might be useful to you, hope it helps.