【ASP.NET MVC】HTML5+MVC上传文件显示进度

head>
    <title>Index</title>
    <style type="text/css">
        #statusBorder
        {
            position:relative;
            height:5px;
            100px;
            border:solid 1px gray;
            display:none;
            }
        #statusFill{
            position:absolute;
            top:0;
            left:0;
            0px;
            background-color:Blue;
            height:5px;
}
    </style>
    <script src="../../Scripts/jquery-1.5.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        var uniqueId = " @Guid.NewGuid().ToString()";

        $(document).ready(function (event) {
            $('#startProcess').click(function () {
                $.post("Home/StartLongRunningProcess",{ id: uniqueId }, function (data) {
                    if (data = "null") {
                        alert("文件为空！");
                    }
                    else {
                        $('#statusBorder').show();
                        getStatus();
                    }
                }, "multipart/form-data");
                event.preventDefault;
            });
        });

        function getStatus() {
            var url = 'Home/GetCurrentProgress/' + uniqueId;
            $.get(url, function (data) {
                if (data != "100") {
                    $('#status').html(data);
                    $('#statusFill').width(data);
                    window.setTimeout("getStatus()", 100);
                }
                else {
                    $('#status').html("Done");
                    $('#statusBorder').hide();
                    alert("文件保存成功");
                };
            });
        }
    </script>
</head>
<body>
    <div>
     <div id="status">
            </div>
        <h2>@Html.Encode(ViewData["Message"]) </h2>
        <div>
            <input id="File1" type="file" name="file" />
            <input id="startProcess" type="submit" value="提交" />
        </div>
        <br />
        <div id="statusBorder">
            <div id="statusFill">
            </div>
        </div>
    </div>
</body>
</html>

Action代码

    public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {
            ViewData["Message"] = "Ajax Progress Bar Example";
            return View();
        }

        delegate string ProcessTask(string id);
        MyLongRunningClass longRunningClass = new MyLongRunningClass();

        public ContentResult StartLongRunningProcess(string id)
        {
            var file=Request.Files["file"];
            if (file != null)
            {
                file.SaveAs(Server.MapPath("~/Content/" + file.FileName));
                longRunningClass.Add(id);
                ProcessTask processTask = new ProcessTask(longRunningClass.ProcessLongRunningAction);
                processTask.BeginInvoke(id, new AsyncCallback(EndLongRunningProcess), processTask);
                return Content("ok");
            }
            else
            {
                return Content("null");
            }
        }

        public void EndLongRunningProcess(IAsyncResult result)
        {
            ProcessTask processTask = (ProcessTask)result.AsyncState;
            string id = processTask.EndInvoke(result);
            longRunningClass.Remove(id);
        }

        public ContentResult GetCurrentProgress(string id)
        {
            this.ControllerContext.HttpContext.Response.AddHeader("cache-control", "no-cache");
            var currentProgress = longRunningClass.GetStatus(id).ToString();
            return Content(currentProgress);
        }
        public ActionResult Upload(HttpPostedFileBase[] fileToUpload)
        {
            ViewBag.Message = "File(s) uploaded successfully"; 
            return RedirectToAction("Index");
        }

cs代码

public class MyLongRunningClass
    {
        private static object syncRoot = new object();

        private static IDictionary<string, int> ProcessStatus { get; set; }

        public MyLongRunningClass()
        {
            if (ProcessStatus == null)
            {
                ProcessStatus = new Dictionary<string, int>();
            }
        }

        public string ProcessLongRunningAction(string id)
        {
            for (int i = 1; i <= 100; i++)
            {
                Thread.Sleep(100);
                lock (syncRoot)
                {
                    ProcessStatus[id] = i;
                }
            }
            return id;
        }

        public void Add(string id)
        {
            lock (syncRoot)
            {
                ProcessStatus.Add(id,0);
            }
        }

        public void Remove(string id)
        {
            lock (syncRoot)
            {
                ProcessStatus.Remove(id);
            }
        }

        public int GetStatus(string id)
        {
            lock (syncRoot)
            {
                if (ProcessStatus.Keys.Count(x => x == id) == 1)
                {
                    return ProcessStatus[id];
                }
                else
                {
                    return 100;
                }
            }
        }
    }

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原文地址：https://www.cnblogs.com/wywnet/p/3406832.html