@{

    ViewBag.Title = "Index";

    Layout = "~/Views/Shared/_Layout.cshtml";

}

<h2>Index</h2>

<form id="fm1" method="post">

    <input type="file" id="btnfile" name="btnfile" value="提交" />

    <input type="button" id="btn"  value="上传" />

</form>

<div id="divimg"></div>

@section scripts{

<script src="/scripts/MyAjaxForm.js" type="text/javascript"></script>

<script type="text/javascript">

    $(function () {

        $("#btn").click(function () {

           // alert("ok2");

            $("#fm1").ajaxSubmit({

                url: '@Url.Action("Uploadfile")',

                type: 'post',

                success: function (data) {

                    data = data.replace('<PRE>', '').replace('</PRE>', '');

                    $('#divimg').append('<img src="' + data + '" width="200px"  height="200px" />');

                    var file = $('#btnfile');

                    file.after(file.clone().val(''));

                    file.remove();

                }

            });

        });

    });

</script>

}

   public ActionResult Uploadfile()

        {

            //上传文件

            HttpPostedFileBase img = Request.Files["btnfile"];

            string s = img.FileName;

            string fileExtension = Path.GetExtension(s);

            string path = "/Temp/"  ;

            if (Directory.Exists(Server.MapPath(path)) == false)//如果不存在就创建file文件夹

            {

                Directory.CreateDirectory(Server.MapPath(path));

            }

            string virpath = path + Guid.NewGuid() + fileExtension ;

            img.SaveAs(Server.MapPath(virpath));

            return Content(virpath);

        }