C＃-获取Ajax数据

I want to send data though Ajax to a C# file, but when I check the received data, It gives me null. Is there someting wrong with my code?

Javascript file

 $(".save").click(function () {
    var ss = "Helloo!";
    $.ajax({
        type: "POST",
        url: "/Notes/save.cshtml",
        global: true,
        data: {fofo: ss},
        processData: false,
        contentType: false,
        cache: false,
        success: function(data){
  console.log(data);
 },
        error: function (req, status, error) {
            alert("There was a problem with the server. Try refreshing the page.");
            return false;
        }
    });
});

C# File which receives the data (save.cshtml)

@{
  var s = Request.Form["fofo"];
 var result = "";
    var userData = s;

    var dataFile = Server.MapPath("~/Notes/lolo.txt");
    File.WriteAllText(@dataFile, s);
    result = "Information saved.";
}
 @if(result != ""){
    <p>Result: @result, @s</p>

}

You are not sending a response back to your AJAX function. Not only that what you're doing isn't standard MVC. You should be hitting a Controller which saves the data in the file at the server side and then send the result back using a JsonResult.

For example:

public JsonResult SaveNotes()
{
    // Code to save file here

    // Return the response 
    return Json({NotesSaved = true});
}

Then in your JavaScript AJAX success object you will then have the NotesSaved object set to true.

Note: You should also change your URL parameter in the AJAX command to something like:

 url: '@Url.Action("SaveNotes")'