Deserialize JSON into dictionary in Web Api controller

Question

I have such JSON string: '{"1":[1,3,5],"2":[2,5,6],"3":[5,6,8]}'

I want to send it to the Web Api Controller without changing using ajax request:

   $.ajax({
        type: "POST",
        url: "Api/Serialize/Dict",
        data: JSON.stringify(sendedData),
        dataType: "json"
    });

In Web Api I have such method:

    [HttpPost]
    public object Dict(Dictionary<int, List<int>> sendedData)
    {
        //code goes here
        return null;
    }

And always sendedData == null. Another words: I don't know how to deserialize JSON into (Dictionary<int, List<int>>.

Thank you for answer.

Tried to solve this for some time - then read this : http://stackoverflow.com/questions/4710729/post-json-dictionary — Yasser Shaikh, Apr 10 '14 at 13:41

score 1 · Answer 1 · answered Apr 10 '14 at 12:54

1

Try this

 [HttpPost]
    public object Dict(Dictionary<int, List<int>> sendedData)
    {
       var d1 = Request.Content.ReadAsStreamAsync().Result;
       var rawJson = new StreamReader(d1).ReadToEnd();
       sendedData=Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<int, List<string>>>(rawJson);

    }

answered Apr 10 '14 at 12:54

Nilesh Gajare

6,302
3
42
73

1

Try `String rawJson = Request.Content.ReadAsStringAsync().Result;` – Hot Licks Jun 04 '14 at 17:11

score 1 · Answer 2 · answered Mar 20 '19 at 13:00

1

You can send the data like this:

{"sendedData":[{"key":"1","value":[1,3,5]},{"key":"2","value":[2,5,6]},{"key":"3","value":[5,6,8]}]}

Image of the function in the controller: Dict

answered Mar 20 '19 at 13:00

Eduardo Wan-dall

11
1

score 0 · Answer 3 · answered Apr 10 '14 at 12:51

0

Try it:

Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<int, List<string>>>("{'1':[1,3,5],'2':[2,5,6],'3':[5,6,8]}");

answered Apr 10 '14 at 12:51

Daniel Melo

548
5
12

score 0 · Answer 4 · answered Apr 10 '14 at 13:58

Try using:

public ActionResult Parse(string text)
{
    Dictionary<int, List<int>> dictionary = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<int, List<int>>>(text);
    return Json(dictionary.ToString(), JsonRequestBehavior.AllowGet);
}

This works when the sent data doesn't have quotes around the indices:

{1:[1,3,5],2:[2,5,6],3:[5,6,8]}

Also make sure that you send an object in the Javascript:

data: { 
    text: JSON.stringify(sendedData)
},

Andrew · Answer 5 · 2014-04-11T07:35:05.623

0

specify the content type parameter when performing ajax call, dataType is for return result:

$.ajax({ 
       type: "POST",
       url: "Api/Serialize/Dict", 
       contentType: "application/json; charset=utf-8", //!
       data: JSON.stringify(sendedData) 
});

edited Apr 11 '14 at 07:35

answered Apr 10 '14 at 19:14

Andrew

3,648
1
15
29

His problem is the ajax call he's building, not the server side. He used dataType(which is for result), where as contentType should be specified as application/json. I've already answered him in his other similar thread(he has two), copied the answer here for those who were trying to figure out the issue. One of those threads should be closed as duplicate though. – Andrew Apr 11 '14 at 07:31

score 0 · Answer 6 · answered Oct 08 '19 at 07:21

You missed the [FromBody] annotation in the sendedData param. Try this:

[HttpPost]
[Consumes("application/json")]
[Produces("application/json")]
public object Dict([FromBody] Dictionary<int, List<int>> sendedData)
{
    //code goes here
    return null;
}

Deserialize JSON into dictionary in Web Api controller

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