Object is NULL when passed to Web API in .NET C#

Question

I am facing problem while passing object value to Web API. I am passing value using Anuglar5

{
    "Company_User_Process_ID": 68,
    "BankName": "1860 UBL , ABBOTTABAD",
    "ChallanNo": "",
    "AccountTitle": "",
    "AccountNo": "",
    "CompanyName": "sdasd",
    "RegistrationNo": "",
    "ProcessId": 1,
    "PaymentType": false,
    "Document_Pid": "",
    "HeadsOfAccount": []
}

But I am getting Null. I got some help from This Answer. But I observed that the object that I am passing is not same as I am getting in Web API with extra {}

{
  {
    "Company_User_Process_ID": 68,
    "BankName": "1860 UBL , ABBOTTABAD",
    "ChallanNo": "",
    "AccountTitle": "",
    "AccountNo": "",
    "CompanyName": "sdasd",
    "RegistrationNo": "",
    "ProcessId": 1,
    "PaymentType": false,
    "Document_Pid": "",
    "HeadsOfAccount": []
  }
}

Here is the Code of Web API

public async Task<ResponseObject<ChallanDetailViewModel>>   CreateChallanDetail(ChallanDetailViewModel model)
 {
     ...... My code here 
 }

Here is the Model Class

public class ChallanDetailViewModel
{
    public long Company_User_Process_ID { get; set; }

    public string BankName { get; set; }

    public string ChallanNo { get; set; }

    public string AccountTitle { get; set; }

    public string AccountNo { get; set; }

    public string CompanyName { get; set; }

    public string RegistrationNo { get; set; }

    public int ProcessId { get; set; }

    public int PaymentType { get; set; }

    public string Document_Pid { get; set; }

    public List<String> HeadsOfAccount { get; set; }

}

Client Side code that is passing object

this.http.post(url, model).map((response: any) => { return 
response.json() }).toPromise();

While passing the object are you wrapping the object to another object? — user1672994, Apr 12 '18 at 09:19
You didn't include your asp.net model (and signature of your controller method) - so it's not much we can help with. Getting null usually means your model does not match json you post, but we don't know your model. — Evk, Apr 12 '18 at 09:32
Still didn't include the model (definition of class `ChallanDetailViewModel`). — Evk, Apr 12 '18 at 09:38
You should also post the client side code that is serializing and sending the model to your web API. Since, you mentioned that you are getting the object with extra curly braces, so it may be wrong in the way you are serializing the object. — Thangadurai, Apr 12 '18 at 09:43
`PaymentType` is `int` in your model, but you are passing `false` (boolean) there. Either change `PaymentType` to `bool` or pass integer there (`"PaymentType": 0` or something) — Evk, Apr 12 '18 at 10:25

Felix Too · Answer 1 · 2018-04-12T17:03:17.823

-1

I'm not sure if it's the case for you. While passing a nested child list/collection to the API, the model should initialize the list in the constructor like below in order for it to pick the binding:

public class ChallanDetailViewModel
{
    public ChallanDetailViewModel()
    {
        HeadsOfAccount = new List<string>();
    }
    //Other properties
    public List<String> HeadsOfAccount { get; set; }
}

edited Apr 12 '18 at 17:03

answered Apr 12 '18 at 15:05

Felix Too

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Object is NULL when passed to Web API in .NET C#

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