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Restsharp JSON response search

I need to search the following JSON response. I have no control over how the JSON is returned to me or how it is nested. I am using Restsharp by default, but I am open to whatever method helps me accomplish the task.
{
"response": [
{
"id": 1008,
"brandId": 74,
"collectionId": 32,
"productTypeId": 1,
"nominalCodeStock": "1200",
"nominalCodePurchases": "5002",
"nominalCodeSales": "4000",
"seasonIds": [
],
"identity": {
"sku": "SKU0001",
"isbn": "0684843285",
"ean": "ISNB09712345",
"upc": "5778400001",
"barcode": "738737638"
},
"productGroupId": 0,
"featured": false,
"stock": {
"stockTracked": true,
"weight": {
"magnitude": 0.7
},
"dimensions": {
"length": 2,
"height": 12,
"width": 5,
"volume": 120
}
},
"financialDetails": {
"taxCode": {
"id": 7,
"code": "T20"
}
},
"salesChannels": [
{
"salesChannelName": "Brightpearl",
"productName": "Product B",
"productCondition": "new",
"categories": [
{
"categoryCode": "276"
},
{
"categoryCode": "295"
}
],
"description": {
"languageCode": "en",
"text": "Some description",
"format": "HTML_FRAGMENT"
},
"shortDescription": {
"languageCode": "en",
"text": "Some short description",
"format": "HTML_FRAGMENT"
}
}
],
"composition": {
"bundle": false
},
"variations": [
{
"optionId": 1,
"optionName": "Colour",
"optionValueId": 1,
"optionValue": "Black"
},
{
"optionId": 3,
"optionName": "Colour",
"optionValueId": 9,
"optionValue": "Black"
}
],
"warehouses": {
"2": {
"defaultLocationId": 5,
"reorderLevel": 1,
"reorderQuantity": 0
},
"3": {
"defaultLocationId": 0,
"reorderLevel": 1,
"reorderQuantity": 1
}
},
"createdOn": "2015-01-08T17:57:18.000Z",
"updatedOn": "2015-04-01T13:17:58.000Z",
"reporting": {
"categoryId": 353,
"subcategoryId": 369,
"seasonId": 2
},
"primarySupplierId": 202,
"status": "LIVE",
"salesPopupMessage": "Offer the extended warranty",
"version": 1192098806000
}
]
}
Specifically I need to retrieve the categoryCode values. I'm lost on this one. Any direction is much appreciated.

Can i map data getting from MongoDB after lookup and unwind collections

Root Class
SubClass 1
SubClass 2
SubClass 3
Base Properties Class
Dynamic Lookup Function
Error
Class definitions and error is above. Query and result is below.
collection is database.GetCollection<T>().Aggregate(); (IAggregateFluent<T>)
MongodbQuery:
{
"aggregate": "Survey",
"pipeline": [
{
"$lookup": {
"from": "SurveyPart",
"localField": "_id",
"foreignField": "SurveyId",
"as": "SurveyParts"
}
},
{
"$unwind": {
"path": "$SurveyParts",
"preserveNullAndEmptyArrays": true
}
},
{
"$lookup": {
"from": "SurveyPartQuestion",
"localField": "SurveyParts._id",
"foreignField": "SurveyPartId",
"as": "SurveyParts.SurveyPartQuestions"
}
},
{
"$unwind": {
"path": "$SurveyParts.SurveyPartQuestions",
"preserveNullAndEmptyArrays": true
}
},
{
"$lookup": {
"from": "SurveyPartQuestionAnswer",
"localField": "SurveyParts.SurveyPartQuestions._id",
"foreignField": "SurveyPartQuestionId",
"as": "SurveyParts.SurveyPartQuestions.SurveyPartQuestionAnswers"
}
},
{
"$unwind": {
"path": "$SurveyParts.SurveyPartQuestions.SurveyPartQuestionAnswers",
"preserveNullAndEmptyArrays": true
}
},
{
"$match": {
"IsDeleted": false
}
},
{
"$sort": {
"_id": -1
}
},
{
"$skip": 0
},
{
"$limit": 50
}
]
}
MongoDb Result:
[
{
"_id": 1,
"CreatedOn": "",
"ModifiedOn": "",
"CreatedBy": 1,
"ModifiedBy": 1,
"OwningUser": 1,
"StatusCode": 1,
"IsDeleted": false,
"Name": "TEST SURVEY",
"Description": "TEST SURVEY DESCRIPTION",
"SurveyParts": {
"_id": 1,
"CreatedOn": "",
"ModifiedOn": "",
"CreatedBy": 1,
"ModifiedBy": 1,
"OwningUser": 1,
"StatusCode": 1,
"IsDeleted": false,
"Name": "TEST PART",
"Description": "TEST PART DESCRIPTION",
"Order": 1,
"SurveyId": 1,
"SurveyPartQuestions": {
"_id": 1,
"CreatedOn": "",
"ModifiedOn": "",
"CreatedBy": 1,
"ModifiedBy": 1,
"OwningUser": 1,
"StatusCode": 1,
"IsDeleted": false,
"Name": "TEST QUESTION",
"Description": "TEST QUESTION DESCRIPTION",
"ReferenceCode": "TEST REFERENCE",
"Type": "RADIO",
"Order": 1,
"IsRequired": true,
"SurveyPartId": 1,
"SurveyPartQuestionAnswers": {
"_id": 1,
"CreatedOn": "",
"ModifiedOn": "",
"CreatedBy": 1,
"ModifiedBy": 1,
"OwningUser": 1,
"StatusCode": 1,
"IsDeleted": false,
"Name": "TEST ANSWER",
"Hint": "TEST ANSWER HINT",
"Tag": "TEST TAG",
"IsTextField": true,
"Order": 1,
"SurveyPartQuestionId": 1
}
}
}
}
]
I need to map them all at once on the root class. How can i unwind data from this aggregation or is it possible? I spending too many times for this error but i couldnt found anything about it.

Why did my DISTINCT queries stop working in CosmosDB Data Explorer but works in C# API's?

I have some simple queries in a C# web API to my CosmosDB and the API works just fine but the same code copied from the C# code does not work any longer in the Azure Console as it used to
Query as follows
SELECT DISTINCT l.categories[0] as topLevelCat FROM c join l in c.locales
Error message is
Failed to query item for container hm-items: {"headers":{"x-ms-request-charge":0,"x-ms-documentdb-query-metrics":{}}}
This has always worked until I tried it today to try to write some new queries
What am I missing here?
Example Document below
{
"id": "0570eca0-8f16-4c85-a985-e3a271bcc6bc",
"_id": "5b07c2bfbc7407000122e8b4",
"artno": "0614460008",
"vendor": "Acme",
"updatedAt": "2019-06-25T18:50:33.167Z",
"locales": [
{
"title": "Gestreiftes T-Shirt",
"description": "Gestreiftes T-Shirt aus Baumwolljersey.",
"categories": [
"Herren",
"Große Größen",
"T-Shirts & Tanktops",
"T-Shirt"
],
"brand": null,
"images": [
],
"country": "DE",
"currency": "EUR",
"language": "de",
"variants": [
{
"artno": "0614460008005",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "XL",
"color": "Schwarz/Weiß gestreift"
}
},
{
"artno": "0614460008002",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "S",
"color": "Schwarz/Weiß gestreift"
}
},
{
"artno": "0614460008004",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "L",
"color": "Schwarz/Weiß gestreift"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "XS",
"color": "Schwarz/Weiß gestreift"
}
},
{
"artno": "0614460008006",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "XXL",
"color": "Schwarz/Weiß gestreift"
}
},
{
"artno": "0614460008003",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "M",
"color": "Schwarz/Weiß gestreift"
}
}
]
},
{
"title": "Striped T-shirt",
"description": "Striped T-shirt in cotton jersey.",
"categories": [
"Men",
"T-shirts & Vests",
"Short Sleeve",
"T-shirt"
],
"brand": null,
"images": [
],
"country": "UK",
"currency": "GBP",
"language": "en",
"variants": [
{
"artno": "0614460008006",
"urls": [
],
"price": 8.99,
"stock": 1,
"attributes": {
"size": "XXL",
"color": "Black/White striped"
}
},
{
"artno": "0614460008005",
"urls": [
],
"price": 8.99,
"stock": 1,
"attributes": {
"size": "XL",
"color": "Black/White striped"
}
},
{
"artno": "0614460008004",
"urls": [
],
"price": 8.99,
"stock": 1,
"attributes": {
"size": "L",
"color": "Black/White striped"
}
},
{
"artno": "0614460008002",
"urls": [
],
"price": 8.99,
"stock": 1,
"attributes": {
"size": "S",
"color": "Black/White striped"
}
},
{
"artno": "0614460008003",
"urls": [
],
"price": 8.99,
"stock": 1,
"attributes": {
"size": "M",
"color": "Black/White striped"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 8.99,
"stock": 1,
"attributes": {
"size": "XS",
"color": "Black/White striped"
}
}
]
},
{
"title": "Randig t-shirt",
"description": "En randig t-shirt i bomullstrikå.",
"categories": [
"Herr",
"T-shirts & Linnen",
"Kortärmat",
"T-shirt"
],
"brand": null,
"images": [
],
"country": "SE",
"currency": "SEK",
"language": "sv",
"variants": [
{
"artno": "0614460008001",
"urls": [
],
"price": 99,
"stock": 1,
"attributes": {
"size": "XS",
"color": "Svart/Vitrandig"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 99,
"stock": 1,
"attributes": {
"size": "XL",
"color": "Svart/Vitrandig"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 99,
"stock": 1,
"attributes": {
"size": "S",
"color": "Svart/Vitrandig"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 99,
"stock": 1,
"attributes": {
"size": "XXL",
"color": "Svart/Vitrandig"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 99,
"stock": 1,
"attributes": {
"size": "M",
"color": "Svart/Vitrandig"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 99,
"stock": 1,
"attributes": {
"size": "L",
"color": "Svart/Vitrandig"
}
}
]
},
{
"title": "Striped T-shirt",
"description": "Striped T-shirt in cotton jersey.",
"categories": [
"Men",
"T-shirts & Tank tops",
"Short Sleeves",
"T-shirt"
],
"brand": null,
"images": [
],
"country": "US",
"currency": "USD",
"language": "en",
"variants": [
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 0,
"attributes": {
"size": "S",
"color": "Black/white striped"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 0,
"attributes": {
"size": "XL",
"color": "Black/white striped"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 0,
"attributes": {
"size": "M",
"color": "Black/white striped"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 0,
"attributes": {
"size": "L",
"color": "Black/white striped"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 0,
"attributes": {
"size": "XXL",
"color": "Black/white striped"
}
},
{
"artno": "0614460008001",
"urls": [
],
"price": 9.99,
"stock": 1,
"attributes": {
"size": "XS",
"color": "Black/white striped"
}
}
]
}
],
"relatedArtno": [
"0614460001",
"0614460002",
"0614460005",
"0614460006",
"0614460007",
"0614460011",
"0614460012"
],
"_rid": "QEwcAMCVWqgGAAAAAAAAAA==",
"_self": "dbs/QEwcAA==/colls/QEwcAMCVWqg=/docs/QEwcAMCVWqgGAAAAAAAAAA==/",
"_etag": "\"2e00f1ca-0000-0c00-0000-5d144d660000\"",
"_attachments": "attachments/",
"_ts": 1561611622
}
So I expect the output to be the unique top level categories for the locale I specify, for example country = 'DE' should give me the unique top level categories in 'DE' locale like Herren, Damen etc

From the cosmos db console, you could check the error code :
And locate the reason for the specific error referring to this document.
Based on your sql:
SELECT DISTINCT l.categories[0] as topLevelCat FROM c join l in c.locales
there is no syntax or format error in it, so please check the name of variables.
Test your sample data with sql:
SELECT DISTINCT l.categories[0] as topLevelCat,l.country FROM c join l in c.locales
Output:
It seems working.You mean it only broken when the locates never be defined?

Handling double quotes in JSON strings

We have an application with knockout and we are facing a problem that some registers in the database have double quotes, which caused JSON parsing to fail.
Here's my json that is not valid due to a rogue double quote:
{
"OptionSummaries": [
{
"Id": 110,
"Name": "Option 1",
"Status": 1,
"ProductGroupNodes": [
{
"Id": 110,
"Name": "Corporate Brand Reputation",
"Status": 2,
"Waves": [
{
"Id": 110,
"Name": "Wave 1",
"Status": 2,
"Services": [
{
"Id": 1101,
"Title": "Proposal Budget Owner Service",
"CurrencyCode": "USD",
"EstimatedCost": 177.0000,
"CreationDateTime": "/Date(1437472898503)/",
"Status": 2
}
]
}
]
},
{
"Id": 111,
"Name": "2013 Consumer Scan",
"Status": 1,
"Waves": [
{
"Id": 111,
"Name": "Wave 1",
"Status": 1,
"Services": [
{
"Id": 1111,
"Title": "Proposal Budget Owner Service",
"CurrencyCode": "USD",
"EstimatedCost": 0.0000,
"CreationDateTime": "/Date(1437472898503)/",
"Status": 1
}
]
}
]
}
]
},
{
"Id": 115,
"Name": "Option 2",
"Status": 1,
"ProductGroupNodes": [
{
"Id": 115,
"Name": "Corporate Brand Reputation",
"Status": 1,
"Waves": [
{
"Id": 115,
"Name": "Wave 1",
"Status": 1,
"Services": [
{
"Id": 1151,
"Title": "Proposal Budget Owner Service",
"CurrencyCode": "USD",
"EstimatedCost": 0.0000,
"CreationDateTime": "/Date(1437472898503)/",
"Status": 1
}
]
}
]
},
{
"Id": 116,
"Name": "2013 Consumer Scan",
"Status": 1,
"Waves": [
{
"Id": 116,
"Name": "Wave 1",
"Status": 1,
"Services": [
{
"Id": 1161,
"Title": "Proposal Budget Owner Service",
"CurrencyCode": "USD",
"EstimatedCost": 0.0000,
"CreationDateTime": "/Date(1437472898503)/",
"Status": 1
}
]
}
]
}
]
}
],
"ServiceCostsEdit": {
"ServiceId": 1101,
"ServiceName": "Proposal Budget Owner Service",
"ServiceCurrencyIsoCode": "USD",
"ServiceLegalEntityCode": "0310",
"LaborHourCostsPanel": {
"LaborHourCosts": [
{
"Id": 2,
"CostCenters": [
{
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "3101010001 - Consumer KAM Group",
"Value": "3101010001"
},
{
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "3102510255 - Knowledge Panel",
"Value": "3102510255"
}
],
"FiscalYears": [
{
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "2013",
"Value": "2013"
}
],
"LaborGrades": [
{
"Code": "0HL002",
"CurrencyCode": "USD",
"Rate": 44.0000,
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "0HL002 - 44.00/hr USD",
"Value": "0HL002"
}
],
"SelectedLaborGradeCostCenter": "3101010001",
"SelectedLaborGradeFiscalYear": 2013,
"SelectedLaborGradeCode": "0HL002",
"SelectedLaborGradeRate": 44.0000,
"SetupHours": 2.00,
"ManagementHours": 1.00,
"DeliveryHours": 1.00,
"IsEmpty": false
}
],
"LaborHourCostsCostCenterDataSource": [
{
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "3101010001 - Consumer KAM Group",
"Value": "3101010001"
},
{
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "3102510255 - Knowledge Panel",
"Value": "3102510255"
}
],
"DefaultCostCenterCodeForInitialEmptyRecord": null,
"DefaultFiscalYearForInitialEmptyRecord": null,
"OverheadCosts": [
{
"LaborGradeCostCenterCode": "3101010001",
"LaborGradeFiscalYear": 2013,
"OverheadRate": 0.0000,
"SetupHours": 2.00,
"ManagementHours": 1.00,
"DeliveryHours": 1.00
}
],
"OverheadCostsVisible": true,
"OverheadCostsInitialDataSource": [
{
"Key": {
"CostCenterCode": "3101010001",
"FiscalYear": 2013
},
"Value": {
"Code": "0HO001",
"CurrencyCode": "USD",
"Rate": 0.00,
"Disabled": false,
"Group": null,
"Selected": false,
"Text": "0HO001 - USD 0.00/hr",
"Value": "0HO001"
}
}
],
"CostCenter": "F2F PAPI",
"ServiceCurrencyIsoCode": "USD",
"EditingAllowed": true
},
"VendorCostsPanel": {
"VendorCosts": [
{
"Id": 132,
"SelectedCostElementCode": "1992000004",
"VendorCode": "",
"VendorName": null,
"Description": "doublequotes"","DirectCostAttachment":null,"Quantity":1,"VendorRate":1.0000,"IsEmpty":false}],"CostElements":[{"Disabled":false,"Group":null,"Selected":false,"Text":"ExternalSuppliercosts","Value":"1992000004"},{"Disabled":false,"Group":null,"Selected":false,"Text":"Licensesfromaffilitatedcompanies","Value":"1992000002"}],"ServiceCurrencyIsoCode":"USD","EditingAllowed":true},"CostingAssumptionsPanel":{"Description":"","EditingAllowed":true},"ServiceSpecificationsPanel":{"Title":"ProposalBudgetOwnerService","Type":"ProposalBudgetOwnerService","Fields":[{"Value":"Hellolonglonglongtext...","Id":153,"Code":"OVERVIEW","Title":"Overview","IsRequiredForCosting":false,"DependencyVisibilityExpression":null,"FieldCodesToReevaluateOnChange":[],"EditingAllowed":false}]},"ApprovalComments":{"CommentType":0,"Message":null,"ApproverName":null,"ApproverEmail":null,"AnyComments":false},"RejectedCostInfoVisible":false,"EditingAllowed":true},"SubmitCostsEnabled":true,"EditingAllowed":false,"SelectedTreeNode":{"Id":1101,"Type":3},"Proposal":{"ProposalId":11,"ProposalName":"Ad-hocatCostingonMain","ProposalCostCenterCode":"3102510220","ProposalValid":{"IsValid":true,"ErrorMessage":""},"SoldToCustomer":"JenniferSamson","ExpectedProjectStartDate":"/Date(1426892400000)/","ExpectedProjectEndDate":"/Date(1431208800000)/","FunctionalityAreaEnabled":true}}
If you test this json against jsonlint you will see where the problem lies. What is the best way to handle this? I think the way I'm serializing the C# model to JSON is not proper? To do that I use:
var jsonModel = JsonConvert.SerializeObject(Model);
Any help is very appreciated.
EDIT
Issue was fixed. Problem was with the serialization.
I fixed this by using the method HttpUtility.JavaScriptStringEncode
var jsonViewModel = HttpUtility.JavaScriptStringEncode(Json.Encode(Model));
This solved my problem. All I had to do to pass this to knockout was #Html.Raw(jsonViewModel)
Best regards and thanks everyone!
Daniel

How to display JSON Data onto a UITableView

I am using Xamarin.iOS to return a JSON and attempt to place it on a UITableView, however I cannot seem to get it to work, here is what I am attempting to do so far:
Main View Controller
This is how I am returning the JSON
var request = new RestRequest {RootElement = "data", Resource = "/users/self/feed"};
request.AddParameter("access_token", instagramAccessToken);
var client = new RestClient ("https://api.instagram.com/v1");
// Edited Client Execution
client.ExecuteAsync(request, response =>
{
RootObject rootObject = JsonConvert.DeserializeObject<RootObject>(response.Content);
table.Source = new TableSource(rootObject.data);
table.ReloadData();
}
);
TableSource Class
public List<RootObject> Data { get; set; }
protected string cellIdentifier = "TableCell";
public TableSource ()
{
Data = new List<T> ();
}
public TableSource(List<T> data)
{
Data = data;
}
public override int RowsInSection (UITableView tableview, int section)
{
return Data.Count;
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
if (OnRowSelected != null) {
OnRowSelected (this, new RowSelectedEventArgs (tableView, indexPath));
}
}
public class RowSelectedEventArgs : EventArgs
{
public UITableView tableView { get; set; }
public NSIndexPath indexPath { get; set; }
public RowSelectedEventArgs(UITableView tableView, NSIndexPath indexPath) : base()
{
this.tableView = tableView;
this.indexPath = indexPath;
}
}
public event EventHandler<RowSelectedEventArgs> OnRowSelected;
public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)
{
UITableViewCell cell = tableView.DequeueReusableCell (cellIdentifier);
// if there are no cells to reuse, create a new one
if (cell == null)
cell = new UITableViewCell (UITableViewCellStyle.Default, cellIdentifier);
// Edited Text
cell.TextLabel.Text = ((Datum)Data[indexPath.Row]).user.username;
return cell;
}
I didn't really have a concrete method of displaying the JSON on the Table, so I would be pretty open to radical change. BTW the JSON loads on the MainViewController perfectly.
JSON Response
Most of your suggestions don't take into consideration how the JSON looks like so here you go:
{
"pagination": {
"next_url": "https://api.instagram.com/v1/users/self/feed?access_token=6489401.88b3fb2.7af2a0355ea24f4590efa1ee82ed0a49&max_id=668439962408115415_16915182",
"next_max_id": "668439962408115415_16915182"
},
"meta": {
"code": 200
},
"data": [
{
"attribution": null,
"tags": [
"selfie"
],
"type": "image",
"location": null,
"comments": {
"count": 0,
"data": []
},
"filter": "Normal",
"created_time": "1393953134",
"link": "http://instagram.com/p/lIO1_jmkkr/",
"likes": {
"count": 14,
"data": [
{
"username": "muahjay",
"profile_picture": "http://images.ak.instagram.com/profiles/profile_304620904_75sq_1392618687.jpg",
"id": "304620904",
"full_name": "Jeanettee Nicole Cambero Gamez"
},
{
"username": "iam_mrsmith31",
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"text": "#Selfie",
"from": {
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}
},
{
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"amen"
],
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"text": "#tmcmc Dobson a Christian!!!!",
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},
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{
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"text": "Yo my cousin got me a singed autograph from you at the Boston boat show thanks man #a_dobson3",
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"link": "http://instagram.com/p/lIIUdggtOj/",
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"text": "#RP from #flashgoodwin #AMEN",
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],
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"data": [
{
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"text": "My guy! The greatest! I just want him to get another ring so the haters can stop saying he hasn't won one since 04. I mean he still won them right? #TomBrady #patriots",
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"full_name": "Allyson 💌"
},
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{
"created_time": "1393952694",
"text": "Let's go !",
"from": {
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"id": "421023272",
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},
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{
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"text": "♡",
"from": {
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"profile_picture": "http://images.ak.instagram.com/profiles/profile_181245582_75sq_1391928288.jpg",
"id": "181245582",
"full_name": "Karen💕"
},
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{
"created_time": "1393952914",
"text": "Follow for patriots pics daily!! (Ifollowback)",
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{
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"text": "Best ever; period. Let's see anyone win a ring with the humps he's had to work with, (except Randy).",
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{
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"text": "👈🏈🙌",
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{
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]
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},
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},
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"text": "#tb12",
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{
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"width": 480,
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},
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}
After those two Edits I still have two errors:
Error on Main View Controller
Error on Table Source

No need to assign the Data multiple times. Assign the source once and then call ReloadData().
client.ExecuteAsync(request, response =>
{
var rootObject = JsonConvert.DeserializeObject<RootObject>(response.Content);
table.InvokeOnMainThread(() =>
{
table.Source = new TableSource(rootObject.data);
table.ReloadData();
});
}
);
EDIT: It seems there are four items in the Datum field and the last one is null.
https://github.com/sami1971/SimplyMobile/blob/master/iOS/Samples/TwitterSample/Twitter.cs
ToString() override for Datum:
public override string ToString()
{
if (user == null)
{
return "User is null";
}
return user.full_name;
}
For full sample download the project, open iOS/SimplyMobile.iOS.sln and run Samples/TwitterSample.

You should be able to do something like this:
cell.TextLabel.Text = ((Datum)Data[indexPath.Row]).user.username;

you have to reload tableView when all data retrived from url to your dictionary or array.
you can do this like this
[self.Yourtableview reloadData];