mattdwen mattdwen - 22 days ago 6
C# Question

WebAPI POST [FromBody] not binding

I'm posting JSON to a WebAPI controller, but the properties on the model are not being bound.

public void Post([FromBody] Models.Users.User model) {
throw new Exception(model.Id.ToString());
}


The raw request is as follows:

POST http://diva2.local/siteapi/User HTTP/: diva2.local
Connection: keep-alive
Content-Length:: application/json, text/plain, */*
Origin: http://diva2.local
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.: application/json;charset=UTF: http://diva2.local/Users
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=: ISO-8859-1,utf-8;q=0.7,*;q=: .ASPXAUTH=4; __RequestVerificationToken=Rp_hUysjwCjmsxw2

{"Id":3,"FirstName":"DIVA2","LastName":"User1","Username":"diva1","IsApproved":true,"IsOnlineNow":true,"IsChecked":true}


Every example I can find tells me this should work, but
model.Id == null
.

However, if I change the JSON to:

{User: {"Id":3,"FirstName":"DIVA2","LastName":"User1","Username":"diva1","IsApproved":true,"IsOnlineNow":true,"IsChecked":true}}


everything binds correctly.

This doesn't seem correct. I guess I could accept
JObject
as the parameter, and bind it up manually, but it feels like the above should Just Work (tm)?

Update:

I've changed the method to return the model, and I still receive null.

public Models.Users.User Post(Models.Users.User user) {
return user;
}


And the response:

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/json; charset=utf-8
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-MiniProfiler-Ids: ["a0fab514-d725-4d8f-9021-4931dc06ec4a","fdeeb9a8-9e36-41d8-91d3-5348e880e193","c1b4cc86-d7c3-4497-8699-baac9fa79bf1"]
X-Powered-By: ASP.NET
Date: Tue, 21 May 2013 09:06:00 GMT
Content-Length: 4

null

Answer

My user model did not have a parameter-less constructor.