使用jquery uploadify上传图片报302错误研究了半天，发现我上传的action中有根据session判断用户是否登录，如果没有登录就跳到登陆页，所以就出现了302跳转错误。原来更新了flash的版本以后，通过uploadify获取不到session的值。我目前的解决办法是：
Global.asax.cs中：
/// <summary>/// 解决uploadif上传无法获取Cookie的情况/// </summary>/// <param name="sender"></param>/// <param name="e"></param>protected void Application_BeginRequest(object sender, EventArgs e){try{HttpRequest request = HttpContext.Current.Request;foreach (string k in request.Form.Keys){if (k.IndexOf("cookie_") >= 0)AppendingCookies(k.Remove(0, 7), request.Form[k], request);}}catch { }}private void AppendingCookies(string cookieName, string cookieValue, HttpRequest request){HttpCookie hc = request.Cookies.Get(cookieName);if (null == hc)hc = new HttpCookie(cookieName);hc.Value = cookieValue;request.Cookies.Set(hc);}
上传方法：
[HttpPost]public JsonResult Upload(HttpPostedFileBase fileData){string cookie_LoginUserKey = Request.Form["cookie_LoginUserKey"];if (realCookie != cookie_LoginUserKey){return Json("上传失败");}if (fileData != null){try{string CompanyId = ManageProvider.Provider.Current().CompanyId;Sys_Company model = companybll.GetEntity(CompanyId);string CompanyCode = model.Code;string folder = DateTime.Now.ToString("yyyyMM");// 文件上传后的保存路径string filePath = Server.MapPath("~/Uploads/" + CompanyCode + "/Web/" + folder + "/");if (!Directory.Exists(filePath)){Directory.CreateDirectory(filePath);}string fileName = Path.GetFileName(fileData.FileName);// 原始文件名称string fileExtension = Path.GetExtension(fileName); // 文件扩展名string saveName = Guid.NewGuid().ToString() + fileExtension; // 保存文件名称int filesize = fileData.ContentLength / 1024;if (filesize > 1024 || filesize <= 2 || (fileExtension != ".jpg" && fileExtension != ".png" && fileExtension != ".gif")){return Json(new { Success = false, Message = "上传失败！\r请上传jpg/png格式图片,文件大小不要超过2MB" }, JsonRequestBehavior.AllowGet);}else{fileData.SaveAs(filePath + saveName);return Json(new { Success = true, FilePath = "/Uploads/" + CompanyCode + "/Web/" + folder +"/"+ saveName, SaveName = saveName });}}catch (Exception ex){return Json(new { Success = false, Message = ex.Message }, JsonRequestBehavior.AllowGet);}}else{return Json(new { Success = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);}}
视图中：
$(document).ready(function () {$('#file_upload').uploadify({uploader: '/School/Sites/Upload',swf: '/Content/Scripts/uploadify3.2.1/uploadify.swf',buttonText: "请选择上传图片",height: 24,width: 120,'fileExt': '*.jpg;*.gif,*.png', //允许上传的文件格式为*.jpg,*.gif,*.png//'fileDesc': 'Web Image Files(.JPG,.GIF,.PNG)', //过滤掉除了*.jpg,*.gif,*.png的文件//'queueID': 'fileQueue','sizeLimit': '2048000',//最大允许的文件大小为2M//'auto': false, //需要手动的提交申请'multi': false, //一次只允许上传一张图片formData: { @foreach(string k in Request.Cookies.AllKeys){@:'cookie_@(k)' : '@Request.Cookies[k].Value',}'': ''},'onUploadSuccess': function (file, data, response) {var obj = jQuery.parseJSON(data); //把返回的Json序列转化为obj对象if (obj.Success) {//alert(obj.FilePath);$('#PictureUrl').val(obj.FilePath);$('#pic').attr("src", obj.FilePath);$('#pic').show();}elsealert(obj.Message);}});});
