Post With C# WebClient Multiple Json Object

Question

I want to send Post Request with C# WebClient with this Json Schema :

 [
 {
 "id": "00000000-0000-0000-0000-000000000000",
 "points": [
 {
 "timestamp": "2017-12-04T16:07:44.562Z",
 "value": 0
 }
 ]
 }
]

I've tried This :

public class RequestData
{
 public string id {get; set; }
 public points points { get; set; }
}
public class points
{
 public DateTime timestamp { get; set; }
 public float value { get; set; }
}

My Program :

Random number = new Random();
var req = new RequestData();
req.id = "0e13d9c-571c-44f4-b796-7c40c0e20a1d";
req.points = new points { timestamp = DateTime.UtcNow, value = 
number.Next(100, 99999) };
JsonSerializerSettings settings = new JsonSerializerSettings();
var data = JsonConvert.SerializeObject(req);
WebClient client = new WebClient(); 
client.Headers.Add(HttpRequestHeader.Authorization, 
AquaAtuhorization.accessToken);
client.Headers.Add(HttpRequestHeader.ContentType, "application/json"); 
client.UploadString ("http://localhost:8080/api/v1/data/writeNumericValues", 
data ); 

And I always get Http 415 (Unsupported Media Type).

How could I format my C# Object as the restApi accepeted Format.

Answer 1

Look at the JSON, the square brackets [ ] denote that something is an array. In this case both RequestData and points have to be an array, see the example below:

public class RequestData
{
 public string id { get; set; }
 public List<points> points { get; set; } // I use list, could be an array
}
public class points
{
 public DateTime timestamp { get; set; }
 public float value { get; set; }
}

Then construct your req object like this:

var req = new List<RequestData> // Again I use list, could be an array
{
 new RequestData
 {
 id = "0e740d9c-571c-44f4-b796-7c40c0e20a1d",
 points = new List<points> // Defined as a list, even though it has one entry
 {
 new points
 {
 timestamp = DateTime.UtcNow,
 value = number.Next(100, 99999)
 }
 }
 }
};

Then just serialize it as normal, the result will be the below:

[
 {
 "id":"0e740d9c-571c-44f4-b796-7c40c0e20a1d",
 "points":[
 {
 "timestamp":"2017-12-04T17:12:25.8957648Z",
 "value":59522.0
 }
 ]
 }
]

Answer 2

Your Json class needs to be like this, see http://json2csharp.com/ or use paste as JSON from VS https://blog.codeinside.eu/2014/09/08/Visual-Studio-2013-Paste-Special-JSON-And-Xml/

public class Point
{
 public DateTime timestamp { get; set; }
 public int value { get; set; }
}
public class RootObject
{
 public string id { get; set; }
 public List<Point> points { get; set; }
}`

• HellYeah: Thank you Saj, but i still get the same Http 415 error
• fuzzybear: use fiddler and check if it's setting a content type header, also check if your API is wanting a string