How to send multiple JSON objects in one web api post?

Question

1.00/5 (1 vote)

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I am looking at this example (example 8) how to send or post multiple Json objects. I wanted to pass an entity type model but not sure how using the said example.

C#

[Route("example8")]
[HttpPost]
public string GetListsFromBody([FromBody] List<List<ParamsObject>> paramsList)
{
  if (paramsList != null)
  {
    return "recieved a list with length:" + paramsList.Count;
  }
 
  return "NOTHING RECIEVED...";
}

JSON with 2 objects

JavaScript

[
 [
  {"Id1":3,"Id2":76,"Id3":19},
  {"Id1":56,"Id2":87,"Id3":94},
  {"Id1":976,"Id2":345,"Id3":7554}
 ],
 [
  {"Id1":3,"Id2":76,"Id3":19},
  {"Id1":56,"Id2":87,"Id3":94},
  {"Id1":976,"Id2":345,"Id3":7554}
 ]
]

I currently have this applied on my code. But I can't do db.Sales_.Add(Sales); It's saying it has an overload error.

C#

[ResponseType(typeof(Sales))]
public HttpResponseMessage PostSales([FromBody]List<List<Sales>> Sales, [FromUri] string auth)
{
    try
    {
        if (ModelState.IsValid)
        {
          db.Sales_.Add(Sales);
          db.SaveChanges();
          return Request.CreateErrorResponse(HttpStatusCode.OK, "Added!");
         }
            else { //...

Posted 29-Apr-15 4:38am

Joshua Masa

Updated 21-Apr-17 10:47am

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-04-29T04:57:00

In principle, you can send any content in HTTP request, it only need to be serializable into a string. So, it could be multiple JSON object. I don't even understand where you could get stuck.

However, you are not trying to send 2 or more. And that is reasonable. What you called "JSON with 2 objects" is nothing but just one JSON string which will be parsed into one object. This object is the top-level array. You cannot even say "with 2 objects". It's one object with two element objects, inner array, each having three element objects, each having three properties.

Therefore, the problem you are concerned with simply does not exist. And if it ever appears, you can always reduce it to one object, by wrapping your N objects in an outer object having two properties. Exactly as in your JSON sample.

Some background: perhaps you need to understand that JavaScript is a loose-type language; and all arrays and '{...}' objects are exactly the same things of the "type" 'object': associative containers (arrays) providing access to the elements by keys of any types. The only difference an array makes is that it has the length property. Please see:
http://en.wikipedia.org/wiki/JavaScript#Dynamic[^],
http://en.wikipedia.org/wiki/Associative_array[^],
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object[^],
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array[^].

See also: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON[^].

—SA