Send array to the API

Question

The API (written in C#, ASP.NET Core) receive 3 fields: title, content and an array of categories (integers):

[HttpGet]
[AllowAnonymous]
public IActionResult CreatePublication(string title, string content, IEnumerable<int> categoryIds)
{
    return Ok();
}

The problem is the API always receive zero elements in the categoryIds array.

The client in Angular4:

let ccategoryIds = new Array<number>()
ccategoryIds.push(2)
ccategoryIds.push(5)
ccategoryIds.push(7)

let requestOptions = {
  params: new HttpParams()
    .set('title', 'The title')
    .append('content', 'The content')
    .append('categoryIds', ccategoryIds.toString()),
  withCredentials: true
}

this.http
  .get('http://localhost:53203/api/publications/createPublication', requestOptions)
  .subscribe(data => {
  },
  (err: HttpErrorResponse) => {
     alert('Error')
  })

Update

If I use JSON.stringify(ccategoryIds) instead of ccategoryIds.toString(), I receive zero elements in the API too.

It is not a problem of the backend. In Postman it works:

Derek Brown · Accepted Answer · 2017-10-17 18:18:25Z

1

Obviously I can't see how you have written the API handler, but I thin you are using .toString() where you should be using JSON.stringify():

let ccategoryIds = new Array<number>()
ccategoryIds.push(2)
ccategoryIds.push(5)
ccategoryIds.push(7)

let requestOptions = {
  params: new HttpParams()
    .set('title', 'The title')
    .append('content', 'The content')
    .append('categoryIds', JSON.stringify(ccategoryId)),
  withCredentials: true
}

this.http
  .get('http://localhost:53203/api/publications/createPublication', requestOptions)
  .subscribe(data => {
  },
  (err: HttpErrorResponse) => {
     alert('Error')
  })

answered Oct 17, 2017 at 18:18

Derek Brown

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1 Comment

Derek Brown Over a year ago

@JohnDoe this seems like a problem on the C# side. Can we see your code there?

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