odata action accepting list parameter is always null

Question

I have a problem with an odata controller.

I wish to send a list of Address-objects, but the received parameter is always null.

My end-point looks like this:

    [EnableQuery]
    public IHttpActionResult SetCoordinatesOnAddressList(IEnumerable<Address> addresses)
    {
        var result = addresses.Select(address => _coordinates.GetAddressCoordinates(address)).ToList();
        return Ok(result);
    }

I have this set up in WebApiConfig

builder.EntityType<Address>().Collection
            .Action("SetCoordinatesOnAddressList")
            .ReturnsFromEntitySet<Address>("Addresses");

I am using Postman to send requests.

My request is sent as a post-request and looks like this:

[{"StreetName":"Some street","StreetNumber":"8","ZipCode":1234,"Town":"Some town"}]

I have a different end-point which takes a single Address instead of an IEnumerable, and that works with the same json-request (without []), so the fields in the json are correct.

So to sum up: My endpoint for an IEnumerable always receives null. Any ideas what might be causing it?

Thank you.

Edit:

I tried changing my end-point to accept an AddressDTO instead, like this:

public IHttpActionResult SetCoordinatesOnAddressList(AddressDTO addresses)
{
    return Ok(2);
}

and this is an AddressDTO:

public class AddressDTO
{
    public IEnumerable<Address> Addresses { get; set; }
}

If I try to post this:

{"Addresses": [{"StreetName":"Some street","StreetNumber":"8","ZipCode":1234,"Town":"Some town"}]}

I get this error:

{
  "error": {
    "code": "",
    "message": "The request entity's media type 'application/json' is not supported for this resource.",
    "innererror": {
      "message": "No MediaTypeFormatter is available to read an object of type 'AddressDTO' from content with media type 'application/json'.",
      "type": "System.Net.Http.UnsupportedMediaTypeException",
      "stacktrace": "   at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\\\r\\\n   at System.Net.Http.HttpContentExtensions.ReadAsAsync(HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\\\r\\\n   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"
    }
  }
}

just use user definded model like this...foo{inenumerable<Address> addresss} — Jagadeesh Govindaraj
– Jagadeesh Govindaraj, Commented Jun 29, 2015 at 13:58
and then your api controller action method should be SetCoordinatesOnAddressList(foo addressModel) — Jagadeesh Govindaraj
– Jagadeesh Govindaraj, Commented Jun 29, 2015 at 13:59
I tried but It didn't work. I edited the original question, with your suggestion. Please take a look. — JacobOJ
– JacobOJ, Commented Jun 30, 2015 at 7:36
try to addd request header... Content-Type: application/json — Jagadeesh Govindaraj
– Jagadeesh Govindaraj, Commented Jun 30, 2015 at 7:51

TomDoesCode · Accepted Answer · 2015-06-29 14:18:30Z

4

What happens if send the collection as a property named addresses on an object, like this?

{"addresses": [{"StreetName":"Some street","StreetNumber":"8","ZipCode":1234,"Town":"Some town"}]}

answered Jun 29, 2015 at 14:18

TomDoesCode

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1 Comment

JacobOJ Over a year ago

The input parameter is still null, sadly.

Hassaan Nasir · Accepted Answer · 2016-03-04 12:58:57Z

3

[HttpPost]
[ODataRoute("SetCoordinatesOnAddressList")]
public IHttpActionResult SetCoordinatesOnAddressList(ODataActionParameters parameters)
{
    IEnumerable<Address> addresses =  parameters["addresses"] as IEnumerable<Address>;
    var result = addresses.Select(address => _coordinates.GetAddressCoordinates(address)).ToList();
    return Ok(result);
}

WebAPIConfig should look like this

builder.Action("SetCoordinatesOnAddressList").Returns<IHttpActionResult>().CollectionParameter<Address>("addresses");

it is not bound to entity therefore access like this localhost/odata/SetCoordinatesOnAddressList

answered Mar 4, 2016 at 12:58

Hassaan Nasir

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1 Comment

yurislav Over a year ago

this should be an accepted answer - setting CollectionParameter did the job.

Prisoner ZERO · Accepted Answer · 2019-05-08 12:31:42Z

3

For action, why don't you use ODataActionParameter as the parameter of the method in the controller?

Here's a simple tutorial about how to use Action:

http://odata.github.io/WebApi/#04-07-action-parameter-support

In which, section "Entity and Collection of Entity parameter" is the same scenario, because I see you defined "Address" as entity type.

builder.EntityType()....

However, "Complex and Collection of Complex parameter" is the scenario for complex type.

edited May 8, 2019 at 12:31

Prisoner ZERO

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answered Jul 1, 2015 at 1:57

Sam Xu

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Comments

JacobOJ · Accepted Answer · 2015-07-03 08:56:51Z

0

I could not get it to work using an Odata controller, and I had to get past it, so what I ended up doing was creating a regular API controller which worked fine.

public IHttpActionResult SetCoordinatesOnAddressList(IEnumerable<Address> addresses)
{
    //Do stuff
}

This was able to accept an Address IEnumerable without any setup and it just worked.

answered Jul 3, 2015 at 8:56

JacobOJ

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