<form action="/Home/Upload" method="post" enctype="multipart/form-data">

        <input type="file" name="File" />

        <button type="submit">方式一上传</button>

    </form>

    <hr />

    <form action="/Home/UploadFile" method="post" enctype="multipart/form-data">

        <input type="file" name="fileName" />

        <button type="submit">方式二上传</button>

    </form>

        //文件上传方式一

        public ActionResult UpLoad()

        {

            Request.Files["File"].SaveAs(Request.MapPath("~/upload/") + Request.Files["File"].FileName);

            int fileCount = Request.Files.Count; //上传数量

            double fileSize = Request.Files["File"].ContentLength; //文件大小（字节）

            string fileName = Request.Files["File"].FileName; //文件名

            string fileType = Request.Files["File"].ContentType;//文件类型

            string fileExt = System.IO.Path.GetExtension(fileName); //文件扩展后缀名

            return Content($"上传数量:{fileCount} 文件名:{fileName} 文件类型：{fileType} 文件格式:{fileExt}");

        }

        //文件上传方式二

        public ActionResult UploadFile(HttpPostedFileBase fileName)

        {

            fileName.SaveAs(Request.MapPath("~/upload/") + fileName);

            return Content("OK");

        }