using json to object binding in asp.net mvc2

Question

I am trying to bind a JSON stringified object to a model and few other strings in the controller and it is not working.

is it not possible,

$.ajax({
url: "/SrcManager/AddDataSource",
type: "POST",
data: JSON.stringify({
    content: ct,
    dataSourceName: $("#dataSrcName").val(),
    parameters: parametersCollection,
    sourceContentId: sourceContentId,
    sourceId: null,
    type: contType
}),
success: function (data) {
    if (data.length > 1)
    {
        alert("DataSource Saved Successfully");
        $("#dataSrcId").val(data);
    }
}
});

and var parametersCollection = [];

function IPParameters(paramName, paramValue) { this.ParamName = paramName; this.ParamValue = paramValue; }

*** action method : public string AddDataSource(ContentModel scvm){.........}

Why does the above not work. Is this not supported or any mistake in the code, kindly suggest the right way.

In the ContentModel, i map the parameters to List<Parameters>.

I have added the JsonValueProviderFactory also in global.asax.

The C# model is :

public class SourceContentViewModel
{
    public string sourceId { get; set; }

    public string dataSourceName { get; set; }

    public string sourceContentId { get; set; }

    public string content { get; set; }

    public string type { get; set; }
    public List<Parameters> parameters { get; set; }

    public SourceContentViewModel()
    {
        parameters = new List<Parameters>();
    }
}

public class Parameters
{
    public string ParamName { get; set; }
    public string ParamValue { get; set; }
}

Can you show your action method and the javascript you use to send that data? — Jan
– Jan, Commented Dec 27, 2011 at 9:49
Can you show how the ContentModel class is defined? Your question is about modelbinding. — Jan
– Jan, Commented Dec 27, 2011 at 9:56

Darin Dimitrov · Accepted Answer · 2011-12-27 09:58:04Z

2

You can't send JSON to an ASP.NET MVC 2 application as there is no JSON provider factory out-of-the-box that will allow you to read the request. It is built in ASP.NET MVC 3. You may take a look at the following blog post and include the JsonValueProviderFactory discussed there. Then you will be able to send JSON requests to your ASP.NET MVC 2 controller actions after registering it:

protected void Application_Start() 
{
    RegisterRoutes(RouteTable.Routes);
    ValueProviderFactories.Factories.Add(new JsonValueProviderFactory());
}

Also notice the contentType: 'application/json; charset=utf-8' setting when sending the request which instructs the binder that you are sending a JSON request.

answered Dec 27, 2011 at 9:58

Darin Dimitrov

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5 Comments

Saravanan Over a year ago

Pls take a look at the updated question. this was working fine sometime back.. but something messed up now..

Darin Dimitrov Over a year ago

@saravanan, no, it's impossible that this has ever worked in an ASP.NET MVC 2 application. Out of the box it doesn't support JSON requests. You are using JSON.stringify in your AJAX request which serializes the object into a JSON string. Maybe before you didn't have this JSON.stringify call?

Saravanan Over a year ago

Adding this to the ajax request fixed the issue. contentType: 'application/json; charset=utf-8'. Thanks Darin Dimitrov.

Darin Dimitrov Over a year ago

@saravanan, if this is working in an ASP.NET MVC 2 application it is because you must have registered a JsonValueProviderFactory as shown in my answer.

Saravanan Over a year ago

I did register the JsonValueProviderFactory in the global.asax. you are right. but forgot the contenttype in ajax call.

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