asp.net webapi 2 post parameter is always null

Question

I have been trying to figure this our for the last hour, but I can't see what's wrong with it

the post is from a xamarin app that I'm writing, using restsharp portable client

POST http://192.168.30.103:8080/api/Order HTTP/1.1
Authorization: Basic xxxx
Content-Length: 51
Content-Type: application/json; charset=utf-8
Host: 192.168.30.103:8080
Connection: Keep-Alive
Pragma: no-cache

{"CheckinCount":1,"EventId":16630,"OrderNo":470292}

It hits the server Post API correctly, but the parameter is always null

 public IHttpActionResult Post([FromBody]string source) {
        dynamic data = JsonConvert.DeserializeObject(source);
        int checkInCount = data.CheckinCount;
        int eventId = data.EventId;
        int orderNo = data.OrderNo;
        return Ok();
    }

I can't figure out why...

Why do you do the deserialization manually and not leave it to web api? — Jürgen Röhr
– Jürgen Röhr, Commented Dec 2, 2016 at 7:39
{"CheckinCount":1,"EventId":16630,"OrderNo":470292} isn't a string. It's an object instead. — Amit Kumar Ghosh
– Amit Kumar Ghosh, Commented Dec 2, 2016 at 7:44
I didn't want to add another DTO for a last minute API addon, but I'll give it a whirl — Danish
– Danish, Commented Dec 5, 2016 at 0:31

levelnis · Accepted Answer · 2016-12-02 07:41:58Z

3

Do you always send the same parameters? If so, could you create a static object instead of using a dynamic one? Something like an EventRequest that you pass in instead?

public class EventRequest
{
    public int CheckinCount { get; set; }
    public int EventId { get; set; }
    public int OrderNo { get; set; }
}

Your Post action then becomes:

public IHttpActionResult Post(EventRequest request) {
    // do something with request
    return Ok();
}

answered Dec 2, 2016 at 7:41

levelnis

7,7256 gold badges41 silver badges64 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Danish Over a year ago

thanks that worked, however i'd still be interested if I wanted to read raw json from body, how would I do it ?

Zachary Scott Over a year ago

Just for my own note, if you forget public on the properties, it won't give you an error, just an empty object with null values for properties. I promise to never ever copy and paste code again!

krishna422 · Accepted Answer · 2021-04-23 11:15:18Z

1

For me, it was the value of that is being sent by checkbox. Checkbox was sending true but for JSON, value must be between quotations i.e. "true".

answered Apr 23, 2021 at 11:15

krishna422

3501 gold badge4 silver badges14 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 10:30:43Z

0

Collectives™ on Stack Overflow

asp.net webapi 2 post parameter is always null

3 Answers 3

2 Comments

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Linked

Related