Deserialize JSON array Object to c# class type conversion

Question

I get JSON data from [HttpPost] in below format. I want to de-serialize to two C# Models.

data {{ 
  "invoiceNumber": "55",
  "invoiceDate": "2018-10-25T13:16:37.843Z",
  "invoiceValue": 55,
  "remarks": null,'
  "items": [
    {
      "gRNNo": "0000000",
      "itemCode": 1,
      "itemDesc": "Lux",
      "qty": "2",      
    },
    {
      "gRNNo": "0000000",
      "itemCode": 2,
      "itemDesc": "Rexona",
      "qty": "1"      
    }
  ]
}}

I am able to get Header data but items array.

PurHeader purHeader = JsonConvert.DeserializeObject<PurHeader>(data.ToString()); //Working for Header

but failed in getting array data. I tried following.

    List<PurDetail> purDetail = JsonConvert.DeserializeObject<List<PurDetail>>(data["items"].ToString());
var purDetail = JsonConvert.DeserializeObject<PurDetail[]>(data["items"].ToString());

My Classes - I use them in Code First. And data json comes from Angular 7 ReactiveForms

public class PurHeader
    {        
        public string GRNNo { get; set; }        
        public string InvoiceNumber { get; set; }
        public DateTime InvoiceDate { get; set; }
        public decimal InvoiceValue { get; set; }
        public string Remarks { get; set; }

        public ICollection<PurDetail> PurDetail { get; set; }
    }

public class PurDetail
    {
        public string GRNNo { get; set; }
        public string ItemCode { get; set; }
        public string ItemDesc { get; set; }
        public decimal Qty { get; set; }

        [ForeignKey("GRNNo")]
        public PurHeader PurHeader { get; set; }
    }

Answer 1

Your JSON is malformed, I hope that's just a typo in your question. However, you should be able to parse the whole set with these classes:

public class Rootobject
{
  public string invoiceNumber { get; set; }
  public DateTime invoiceDate { get; set; }
  public int invoiceValue { get; set; }
  public object remarks { get; set; }
  public Item[] items { get; set; }
}

public class Item
{
  public string gRNNo { get; set; }
  public int itemCode { get; set; }
  public string itemDesc { get; set; }
  public string qty { get; set; }
}

Rootobject purHeader = JsonConvert.DeserializeObject<Rootobject>(data.ToString());

Also see my answer here on how to easily derive classes from XML (same applies to JSON): Parse This XML to object

Answer 2

Assuming your data doesn't have two {{ your code should work. But you could do it without casting to string , just:

var purHeader = data.ToObject<PurHeader>();
var purDetails = data["items"].ToObject<PurDetail[]>();