HomeController.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

namespace ajaxUpload.Controllers

{

    public class HomeController : Controller

    {

        [HttpPost]

        public JsonResult Upload()

        {

            var uploadedFile = Request.Files[0] as HttpPostedFileBase;

            return Json(uploadedFile.FileName);

        }

        public ActionResult Index()

        {

            return View();

        }

    }

}

Index.cshtml@   

ViewBag.Title = "Home Page"}

<div class="jumbotron">

    <h1>Ajax在ASP.NET MVC中上传</h1>

</div>

<div class="row">

    <div id="main">

        <h1>上传您的图片</h1>

        <form id="uploadfrm" method="post" enctype="multipart/form-data" action="/home/upload">

            <input type="file" name="images" id="images" />

        </form>

        <div id="response"></div>

        <ul id="image-list"></ul>

    </div>

    <button onclick="Upload();">上传</button>

</div>

<script>

    function Upload() {

        var form = document.getElementById('uploadfrm');

        var formData = new FormData(form);   // 这里如何把form的数据上传

        $.ajax({

            url: "/home/upload",

            type: "POST",

            data: formData,

            processData: false,

            contentType: false,

            success: function (res) {

                document.getElementById("response").innerHTML = res;

            }

        });

    }

</script>