CODEWITHSUNDEEP
c#httppostasp.net-web-apiswagger
Thomas Perez
Thomas Perez

Reputation: 171

POST multiple collections

I have a method like this (the parameters name intentionally stupid for this example):

[HttpPost]
        [Route("rest/myMethod")]
        public IHttpActionResult MyMethod(string param1, DateTime param2, DateTime param3, IEnumerable<string> param4, IEnumerable<string> param5 = null)
        {
            return Ok();
        }

But when I test it in Swagger I get this error:

{
  "message": "An error has occurred.",
  "exceptionMessage": "Can't bind multiple parameters ('param4' and 'param5') to the request's content.",
  "exceptionType": "System.InvalidOperationException",
  "stackTrace": ""
}

As soon as I remove one of the two collection parameter this works fine.

Why is that ? How can I POST multiple collections of objects in my WebApi ?

Thanks.

PS: I don't know if this is a usefull piece of intelligence but this WebApi will be called from a AngularJS client.

Upvotes: 1

Views: 613

Answers (1)

Darin Dimitrov
Darin Dimitrov

Reputation: 1039190

How can I POST multiple collections of objects in my WebApi ?

By wrapping them in a view model:

public class MyViewModel
{
    public string Param1 { get; set; }
    public DateTime Param2 { get; set; }
    public DateTime Param3 { get; set; }
    public IEnumerable<string> Param4 { get; set; }
    public IEnumerable<string> Param5 { get; set; }
}

that your POST action will take as parameter:

[HttpPost]
[Route("rest/myMethod")]
public IHttpActionResult MyMethod(MyViewModel model)
{
    return Ok();
}

Now you could have the following request:

POST /rest/myMethod HTTP/1.1
Host: example.com
Content-Type: application/json
Content-Length: 174
Connection: close

{
    "Param1": "value of param1",
    "Param2": "2017-01-18T07:31:02Z",
    "Param3": "2017-01-19T07:31:02Z",
    "Param4": [ "foo", "bar" ],
    "Param5": [ "baz" ]
}

Upvotes: 2

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