.net文件上传的方法

前台js代码 导入jQuery上传插件Uploadify 3.2

$("#photofile").uploadify({//上传电子相片
            swf: '/Theme/NewBlueVacation/images/uploadify.swf',
            uploader: '/ExtendClass/UploadFiles.ashx',   //后台处理文件的路径
             85,
            height: 21,
            buttonText: '    ',//上传按钮文字
            fileSizeLimit: '20KB',
            multi: false,
            buttonImage: "/Theme/NewBlueVacation/images/ManualRecharge_tubiao06.png",//上传按钮路径
            fileTypeExts: '*.jpg',//;*.png;*.gif;*.bmp;*.doc;*.docx
            fileTypeDesc: '图片文件',
            onSelectError: function (file, errorCode, errorMsg) {
                switch (errorCode) {
                    case -100:
                        layer.alert("上传的文件数量已经超出系统限制的" + $('#photofile').uploadify('settings', 'queueSizeLimit') + "个文件！");
                        break;
                    case -110:
                        layer.alert("文件 [" + file.name + "] 大小超出系统限制的" + $('#photofile').uploadify('settings', 'fileSizeLimit') + "大小！");
                        break;
                    case -120:
                        layer.alert("文件 [" + file.name + "] 大小异常！");
                        break;
                    case -130:
                        layer.alert("文件 [" + file.name + "] 类型不正确！");
                        break;
                }
            },
            onUploadSuccess: function (file, data, response) {
                if (data == "0") {
                    $.messager.alert("提示", "上传失败!", 'error');
                }
                else {
                    $("<img/>").attr("src", data).load(function () {
                        /*
                          如果要获取图片的真实的宽度和高度有三点必须注意
                          1、需要创建一个image对象：如这里的$("<img/>")
                          2、指定图片的src路径
                          3、一定要在图片加载完成后执行如.load()函数里执行
                        */
                        realWidth = this.width;
                        realHeight = this.height;
                        //如果真实的宽度大于浏览器的宽度就按照100%显示
                        if (realWidth != 358) {
                            this.width = 358;
                        }
                        else {//如果小于浏览器的宽度按照原尺寸显示
                            //$(img).css("width", realWidth + 'px').css("height", realHeight + 'px');
                        }
                        if (realHeight != 441)
                        {
                            this.height=441;
                        }
                    });
                    //$('#photopic').attr('src', data);
                    $('#photofilename').val(data);
                    $('#phototext').val(file.name);
                }
            }
        });

后台C#代码

 public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            HttpPostedFile file = context.Request.Files["Filedata"];
            string Dir = "Upload";
            string uploadPath = "\" + Dir + "\TravelProduct\" + DateTime.Now.ToString("yyyyMMdd") + "\";
            string returnPath = uploadPath.Replace("\", "/");
            uploadPath = HttpContext.Current.Server.MapPath(uploadPath);
            if (file != null)
            {
                if (!Directory.Exists(uploadPath))
                {
                    Directory.CreateDirectory(uploadPath);
                }
                string fileType = Tool.MakeRandomNumber(8, 1) + Tool.GetPicType(file.FileName);
                file.SaveAs(uploadPath + fileType);
                //下面这句代码缺少的话，上传成功后上传队列的显示不会自动消失
                context.Response.Write(returnPath + fileType);
            }
            else
            {
                context.Response.Write("0");
            }
        }
#region 取指定文件的后缀名
        /// <summary>
        /// 取指定文件的后缀名
        /// </summary>
        /// <param name="PicName">文件名或文件路径</param>
        /// <returns></returns>
        public static string GetPicType(string PicName)
        {
            return Path.GetExtension(PicName);
        }
        #endregion