Request.QueryString with AJAX request

Question

I'm trying to join all inputs at an AJAX call to a single string var.

In the backend we have a public JsonResult() which is being called from the frontend with their arguments.

With Request.QueryString.AllKeys we get {string[0]} when it is an AJAX call. When it's a parameter in the URL it returns correctly.

Code we are using is similar to this:

public JsonResult CustomerEdit(Guid customer, int status, string newName, string newLocation, Guid warehouse)
{
    ...
    
    var parts = new List<string>(); // using System.Collections.Generic
    
    foreach (var key in Request.QueryString.AllKeys)
      parts.Add(Request.QueryString[key]);
    
    string result = string.Join(", ", parts);
}

Is there a way to make this work with AJAX call? Or maybe a similar way to achieve this?

UPDATE

AJAX request is similar to:

$.ajax({
    url: '/ControllerName/CustomerEdit',
    type: "POST",
    contentType: "application/json",
    data: JSON.stringify({
        customer: customer,
        status: status,
        newName: newName,
        newLocation: newLocation,
        warehouse: warehouse
    }),
    success: function (response) {
        },
    error: function (response) {
        }
});