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default页面，一个html的button和file

然后通过button提交到

<form id="form1" target="UploadWindow" method="post" action="upload.aspx" enctype="multipart/form-data">

upload.aspx页面

default.aspx本页面

 function SendUpload()

        {

            form1.submit();

            result = window.setInterval("GetValue()",1000);

        }

        function GetValue()

        {

            var percent = "<%=GetUploadStatus() %>";

            alert(percent);

            document.getElementById("bar").style.width=percent+"%";

            if(percent!=100)

                alert(percent);

            else

                window.clearInterval(result);

        }

每秒刷新GetUploadStatus()这个方法获取值

default.aspx.cs

protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            Session["UploadInfo"] = new UploadInfo { };

        }

    }

    public int GetUploadStatus()

    {

        UploadInfo uploadinfo = HttpContext.Current.Session["UploadInfo"] as UploadInfo;

        //UploadInfo uploadinfo = new UploadInfo();

        if (uploadinfo != null)

        {

            int soFar = uploadinfo.UploadLength;

            int total = uploadinfo.ContentLength;

            int percentComplete = (int)Math.Ceiling((double)soFar / (double)total * 100);

            //int percentComplete = 5;

            string message = string.Format("上传{0}......{1}  of  {2}", uploadinfo.FileName, uploadinfo.UploadLength, uploadinfo.ContentLength);

            return percentComplete;

        }

        else

            return 1000;

    }

然后在upload.aspx页面

if (!IsPostBack)

        {

            UploadInfo uploadinfo = this.Session["UploadInfo"] as UploadInfo;

            HttpPostedFile postfile = Request.Files["upload"];

            //UploadInfo uploadinfo = new UploadInfo();

            uploadinfo.IsReady = true;

            if (postfile != null && postfile.ContentLength != 0)

            {

                string path = Server.MapPath(@"~/upload");

                uploadinfo.FileName = Path.GetFileName(postfile.FileName);

                uploadinfo.ContentLength = postfile.ContentLength;

                uploadinfo.UploadLength = 0;

                //uploadinfo.IsReady = true;

                int bufferSize = 1;

                byte[] buffer = new byte[bufferSize];

                using (FileStream fs = new FileStream(Path.Combine(path, uploadinfo.FileName), FileMode.Create))

                {

                    while (uploadinfo.UploadLength < uploadinfo.ContentLength)

                    {

                        int bytes = postfile.InputStream.Read(buffer, 0, bufferSize);

                        fs.Write(buffer, 0, bytes);

                        uploadinfo.UploadLength += bytes;

                        Thread.Sleep(100);

                    }

                }

                Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script>window.parent.message('" + uploadinfo.UploadLength + "')</script>");

            }

            else

                Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script>window.parent.message('请选择文件！')</script>");

            uploadinfo.IsReady = false;

        }

循环给uploadinfo.UploadLength这个赋值

然后通过这个值除整个图片的大小获取百分比。

可是一直不行，出现了个-2147483648这个值

哪里出问题了呢