Unity3D post a json to ASP.NET MVC 4 Web Api

Question

How I do a post with json value to a ASP.NET MVC 4 Web Api Controller? I tried it several ways, but I can't make it works.

First, my simplified Controller action:

[HttpPost]
public Interaction Post(Interaction filter)
{
     return filter;
}

And my post method with Unity3D WWW:

public string GetJson(string url, WWWForm form)
{
    var www = new WWW(url, form);

    while (!www.isDone) { };

    return www.text;
}

Where my WWWForm is:

var form = new WWWForm();
form.AddField("filter", interaction);

I tried specify the header, like:

public string GetJson(string url, byte[] data)
{
    var header = new Hashtable();
    header.Add("Content-Type", "text/json");

    var www = new WWW(url, data, header);

    while (!www.isDone) { };

    return www.text;
}

I really tried to solve this by more than ten different ways and I always get the same result:

Debug.Log(input); // {"Id":15,"Name":"Teste","Description":"Teste","Value":0.0,"Time":10.0}
Debug.Log(output); // {"Id":0,"Name":null,"Description":null,"Value":0.0,"Time":0.0}

Any direction will be helpful. Thanks!

Try adding this to your action if (!ModelState.IsValid) { throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.BadRequest, this.ModelState)); } and see if you get any model state errors in response. — Kiran
– Kiran, Commented Jun 4, 2013 at 6:36

Badrinarayanan Lakshmiraghavan · Accepted Answer · 2013-06-04 08:24:57Z

6

Do not use WWWForm to post JSON. Use something like this.

string input = "You JSON goes here";

Hashtable headers = new Hashtable();
headers.Add("Content-Type", "application/json");

byte[] body = Encoding.UTF8.GetBytes(input);

WWW www = new WWW("http://yourserver/path", body, headers);

yield www;

if(www.error) {
         Debug.Log(www.error);
}
else {
        Debug.Log(www.text);
}

Assuming JSON string in input is like this,

{"Id":15,"Name":"Teste","Description":"Teste","Value":0.0,"Time":10.0}

you will need a class like this

public class Interaction
{
   public int Id { get; set; }
   public string Name { get; set; }
   public string Description { get; set; }
   public string Teste { get; set; }
   // other properties
}

for the action method like this to work

public Interaction Post(Interaction filter)

answered Jun 4, 2013 at 8:24

Badrinarayanan Lakshmiraghavan

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3 Comments

robsonrosa Over a year ago

:It works! Thanks a lot. For everyone... Don't forget to configure the crossdomain file to accept these requests. See the article

Sona Rijesh Over a year ago

Y i am getting error error CS0103: The name `Encoding' does not exist in the current context

Bart Over a year ago

Because you don't have a using System.Text; at the beginning if your file @Sona?

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