Posting objects from Array to .NET core 2 API from Angular 7

Question

I've been struggling with trying to post data from an array to a .net core 2 API. the user has a grid with check-boxes and on each check, it adds the row to the array. however when i attempt to post the data, it's coming in null on the back-end. i've made posts to api's successfully in the past using reactive forms, but that was when it was just one set of values filled out by the user, i need to send prefilled data objects without forms.

.NET API Controller :

[HttpPost("api/updateBillingRecords")]
        public async Task<ActionResult<BillingModel[]>> UpdateBillingRecords([FromBody] BillingModel updatedBillingRecords)
        {
            var incomingRecords =  await kiraBillingService.UpdateBillingRecordsAsync(updatedBillingRecords);
            return Ok("RECORDS UPDATED");
        }

Angular Component :

 doNotBill(i) {
  var index = this.doNotBillRecords.indexOf(i);

  if (index === -1) {

    this.doNotBillRecords.push(i);
  } else {

    this.doNotBillRecords.splice(index, 1);
  }


  // test if records are being added and removed accordingly
  console.log(`Dynamic Data: ${this.doNotBillRecords.values}`);

}

Sending filled array to API:

updateBilling() {
    this.billingService.updateBillingRecords(this.doNotBillRecords).subscribe();
  }

Angular Service:

updateBillingRecords(billingRecord): Observable<BillingRecord[]> {
    const headers = new HttpHeaders({ 'Content-Type': 'application/json' });
    return this.http.post<BillingRecord[]>(this.updateBillingRecordsAPIUrl, billingRecord, { headers: headers });
  }

Mahmoud-Abdelslam · Accepted Answer · 2019-03-26 13:27:39Z

1

you should modify the server parameter to accept an array as you send array from angular . please try to change the parameter accepted to be

 public async Task<ActionResult<BillingModel[]>> UpdateBillingRecords([FromBody] BillingModel[] updatedBillingRecords)

answered Mar 26, 2019 at 13:27

Mahmoud-Abdelslam

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1 Comment

Flightdoc5242 Over a year ago

Thank you! this works now, i can't believe i missed the fact that i needed to absorb the incoming data as a c# array... 'Doh!

Autruche · Accepted Answer · 2019-03-26 13:35:24Z

1

Can you use JSON parsing ?

Angular

updateBillingRecords(billingRecord): Observable<BillingRecord[]> {
       const headers = new HttpHeaders({ 'Content-Type': 'application/json' });
       return this.http.post<BillingRecord[]>(this.updateBillingRecordsAPIUrl, JSON.stringify(billingRecord), { headers: headers });
}

And you use Newtonsoft JSON library to get your array

BillingMode[] updated = Newtonsoft.Json.JsonConvert.DeserializeObject<List<BillingMode[]>("your body").ToArray();

answered Mar 26, 2019 at 13:35

Autruche

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2 Comments

Flightdoc5242 Over a year ago

it is my understanding that from angular 4+ there is no need to parse JSON as this happens automatically, please let me know if this correct?

Autruche Over a year ago

I learned something today :D. I knew angular automatically parses HTTP response, but not that it also parses request :O.

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