How can I send a JSON string to an ASP Web API method with a POST?

Question

I am sending a JSON message to a MVC method. When I debug it calls the method but it seems like the data is not there. In other words answerDetail is null.

Can someone give me some advice on what I may be doing wrong. Here's what I have:

The following MVC Controller method:

[HttpPost]
[ActionName("CheckAnswers")]
public void CheckAnswers(AnswerDetail2 answerDetail)
{
    var a = answerDetail;

}

This message is sent to the method:

POST http://127.0.0.1:81/api/Question/CheckAnswers HTTP/1.1
Host: 127.0.0.1:81
Connection: keep-alive
Content-Length: 722
Accept: application/json, text/plain, */*
Origin: http://127.0.0.1:81
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36
Content-Type: application/json;charset=UTF-8
Referer: http://127.0.0.1:81/questions/5
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Cookie: __RequestVerificationToken=4puG_e0..B181

[{"answerId":5,"text":"<p>x</p>","correct":null,"response":false},
 {"answerId":6,"text":"<p>xx</p>","correct":null,"response":false},
 {"answerId":7,"text":"<p>xxx</p>","correct":null,"response":false}]

Here's my AnswerDetail2 class:

public class AnswerDetail2
{
    public int answerId { get; set; }
    public string text { get; set; }
    public Nullable<bool> correct { get; set; }
    public Nullable<bool> response { get; set; }
}

Update: Please note I changed the header. It's actually going to a Web API method so I think it's okay to post an object. The problem is it's not getting accepted.

Did you mean to say POST instead of PUT? Also, your POST data is an array of AnswerDetail2, not a single instance. — CodingIntrigue
– CodingIntrigue, Commented Sep 17, 2013 at 9:47

Newton Sheikh · Accepted Answer · 2013-09-17 10:06:04Z

2

U r passing a json string but the paramater u have taken is a class. This wont work.

Try this instead.

[HttpPost]
[ActionName("CheckAnswers")]
public void CheckAnswers(string answerDetail)
{
    var a = answerDetail;
    //deserialize ur json string..
}

and u r 'POST'ing the data. R u making an ajax POST method?

try this

var myObject =
{
    answerId: 123,
    text: "my Text",
    correct: true,
    response: false,   
};

var answerDetail = JSON.stringify(myObject);

$.ajax({
type: "POST",
url: <Controller>/CheckAnswers,
data: answerDetail,
success: function(data){
  //what ever
  }
});

edited Sep 17, 2013 at 10:06

answered Sep 17, 2013 at 9:48

Newton Sheikh

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Comments

Super Hornet · Accepted Answer · 2013-09-17 09:48:06Z

0

you can send your requests by ajax with PUT method not by form

answered Sep 17, 2013 at 9:48

Super Hornet

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