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c# - Web API Form Data Collection

I'm trying to post form serialized values to controller (Web API Self Host). I cannot understand why the NameValueCollection is not correctly bound. Client-side using jQuery:

// Form Submit Handler
$( '#form-parameters' ).submit(function (event) {

        event.preventDefault();

        var formData = $(this).serialize();
        // Post serialized form data
        postAssemblyParameters(formData);
});

// Post Form Data to controller test
function postAssemblyParameters(formData){
        $.ajax({
                url: http://localhost/api/test/1,
                type: 'POST',
                data: formData,
                dataType: 'application/x-www-form-urlencoded',
                success: function(x3d) {
                },
                error: function(xhr) {

                }
        });
}

Server-side using Web API Self Host:

public void Post([FromUri] int id, [FromBody] NameValueCollection formData)
{
        Console.WriteLine(id); // OK

        // Collection is NULL
        foreach (var key in formData.AllKeys)
        {
                foreach (var val in formData.GetValues(key))
                {
                        Console.WriteLine(key + ": " + val);
                }
        }
}

Many thanks.

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