Asp.net core MVC ajax

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Ajax

MVC

ASP.NET-Core

I want to put a partialview when the value of a dropdownlist changes. With my code it works but when I want to send data using post method I always have null values. I have seen a lot of different ways to do it but no one works for me.

What I have tried:

My view ajax code:

<pre>@section scripts {
        <script type="text/javascript">

            $("#ProjecteId").on("change", function () {
                var request = JSON.stringify({
                    'ProjecteId': $('#ProjecteId').val()
                });
                $.ajax({
                    type: 'Post',
                    url: '/Consultas/MostrarTipusPersona',
                    dataType: 'json',
                    contentType: 'application/json',
                    data: request,
                    success: function (data) {

                        console.log('sample', data);
                    },
                    error: function () {
                    }
                });
            });
        </script>
    }

My controller:

[HttpPost]
    public IActionResult MostrarTipusPersona([FromBody]string ProjecteId)
    {
        string i = ProjecteId;
        return PartialView("_Ciutada", new Ciutada());
    }