How to pass an array of int in ASP.NET Core Web API

Question

I have this Web API method:

[Route("api/[controller]")]
[ApiController]
public class SubjectsController : ControllerBase
{
    [HttpGet("children")]
    public IActionResult GetAllFromChildren([FromQuery]int[] childrenIds)
    {
        // omitted for brevity
    }
}

I'm trying to call this via Ajax passing in an query string but I can't seem to get it to work. My Ajax call looks like this:

$.ajax({
    url: "/api/subjects/children?childrenIds=1&childrenIds=2&childrenIds=3",
    method: "GET",
    contentType: "application/json; charset=utf-8"
})

The method is called but it the int array does not get populated. What am I doing wrong?

It was a typo from me, I will edit in the question, I checked the code and there is a &. — g_b
– g_b, Commented Aug 23, 2018 at 14:22
Does this answer your question? Pass an array of integers to ASP.NET Web API? — Michael Freidgeim
– Michael Freidgeim, Commented Oct 25, 2020 at 20:17

kml · Accepted Answer · 2018-08-23 14:06:29Z

10

Try add Name to [FromQuery], so the code should look like this:

[Route("api/[controller]")]
[ApiController]
public class SubjectsController : ControllerBase
{
    [HttpGet("children")]
    public IActionResult GetAllFromChildren([FromQuery(Name="childrenIds")]int[] childrenIds)
    {
        // omitted for brevity
    }
}

and ajax url like this:

$.ajax({
    url: "/api/subjects/children?childrenIds=1&childrenIds=2&childrenIds=3",
    method: "GET",
    contentType: "application/json; charset=utf-8"
})

answered Aug 23, 2018 at 14:06

kml

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