ارسال فایل با ajax

    <form id="form"   method="post" enctype="multipart/form-data">
        <input id="file" type="file" accept="image/*" name="image" />
        <input type="submit" value="Upload">
    </form>

    <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>

    <script type="text/javascript">
        $(document).ready(function (e) {
            $("#form").on('submit', (function (e) {
                e.preventDefault();
                var fileUpload = $("#file").get(0);
                var files = fileUpload.files;
                var formData = new FormData();
                formData.append('file', files[0]);
                $.ajax({
                    url: "files/upload",
                    type: "POST",
                    data: formData,
                    contentType: false,
                    cache: false,
                    processData: false,

                    success: function (data) {
                        if (data == false) {
                            // invalid file format.
                            $("#preview").html(data).fadeIn();
                            alert("فایل آپلود نشد")
                        }
                        else {
                            // view uploaded file.
                            alert("فایل با موفقیت آپلود شد")
                            $("#form")[0].reset();
                        }
                    },
                    error: function (e) {
                        //error
                        alert("error : "+ e.statusText);
                    }
                });
            }));
        });
    </script>

        [HttpPost]
        public IActionResult Upload(IFormFile file)
        {
            return Ok(true);
        }

        <input id="file" type="file" accept="image/*" name="image" multiple />

                for (var i = 0; i < files.length; i++) {
                formData.append('file', files[i]);
                }

[HttpPost]
        public IActionResult Upload(IEnumerable<IFormFile> file)
        {

            foreach (var item in file)
            {
                ;//select file
            }
            return Ok(true);
        }