自定义IsAjaxRequest函数在MVC 6中不起作用

Question

I'm having a trouble in detecting ajax request in MVC 6 controller, since IsAjaxRequest is not found in MVC 6 I used the following function:

        public static bool IsAjaxRequest(this HttpRequest request)
    {
        if (request == null)
            throw new ArgumentNullException(nameof(request));
        var x = request.Headers["X-Requested-With"];
        if (request.Headers != null)
            return request.Headers["X-Requested-With"] == "XMLHttpRequest";
        return false;
    }

but the function always return false

my jquery code:

            $("ul.menu a").click(function (e) {
            e.preventDefault();
            var url = $(this).attr("href");
            $('#main-container').load(url);
        });

Answer 1

问题出在选择器中，因为它是错误的e.preventDefault不起作用，请求正常进行，这就是为什么它永远不会是ajax请求的原因。