public void ProcessRequest(HttpContext context)        {            context.Response.ContentType = "text/plain";            StringBuilder sb = new StringBuilder();            string resultcode = null;            string errormsg = null;            string paths = "";            string names = "";            string title = "";            string FILEGUID = "";            if (context.Request.Files.Count == 0)            {                resultcode = "1003";                errormsg = "上传文件为空！";                sb.Append("{\"resultcode\":" + "\"" + resultcode + "\"");                sb.Append(",");                sb.Append("\"errormsg\":" + "\"" + errormsg + "\"");                sb.Append(",");                sb.Append("\"datas\":" + "{");                sb.Append("\"FilePath\":" + "\"" + paths + "\"");                sb.Append(",");                sb.Append("\"FileName\":" + "\"" + names + "\"");                sb.Append(",");                sb.Append("\"FileTitle\":" + "\"" + title + "\"");                sb.Append(",");                sb.Append("\"FileGuid\":" + "\"" + FILEGUID + "\"");                sb.Append("}");                sb.Append("}");            }            else            {                string guid = System.Guid.NewGuid().ToString("N");                string dir = context.Server.MapPath("~/TaskMobile/files/") + guid;                if (!System.IO.Directory.Exists(dir))                {                    System.IO.Directory.CreateDirectory(dir);                }                for (int i = 0; i < context.Request.Files.Count; i++)                {                    //获取上传的文件的对象                      HttpPostedFile img = context.Request.Files[i];                    //获取上传文件的名称                      string s = img.FileName;                    var strFileExtension = s.Substring(s.LastIndexOf('.') + 1, s.Length - s.LastIndexOf('.') - 1).ToUpper();                    String allowextension = System.Configuration.ConfigurationManager.AppSettings["AllowUploadFileType"];                    if (allowextension.IndexOf(strFileExtension) >= 0)                    {                        int len = s.LastIndexOf(".") - s.LastIndexOf("\\") - 1;                        string fileName = s.Substring(s.LastIndexOf("\\") + 1, len);                        string fullName = s.Substring(s.LastIndexOf("\\") + 1);                        fileName = fileName.Replace(",", "");                        fullName = fullName.Replace(",", "");                        fullName = fullName.Replace(":", "");                        //截取获得上传文件的名称(ie上传会把绝对路径也连带上，这里只得到文件的名称)                          //string str = System.Guid.NewGuid().ToString("N")+ s.Substring(s.LastIndexOf(".") - 1); // s.Substring(s.LastIndexOf("\\") + 1);                        string path = dir + "\\" + fullName;                        //保存文件                          img.SaveAs(path);                        paths = HttpRuntime.AppDomainAppVirtualPath + "/TaskMobile/files/" + guid + "/" + fullName;                        title = "/TaskMobile/files/" + guid + "/" + fullName;                        names = fullName;                        //附件大写（单位KB）                        int size = img.ContentLength / 1024;                        //保存附件到文件表                        FILEGUID = new NDFILES().AddFiles(names, "", strFileExtension, NDFILES.getFileType(strFileExtension), size.ToString(), paths, context.User.Identity.Name);                        resultcode = "1000";                        sb.Append("{\"resultcode\":" + "\"" + resultcode + "\"");                        sb.Append(",");                        sb.Append("\"errormsg\":" + "\"" + errormsg + "\"");                        sb.Append(",");                        sb.Append("\"datas\":" + "{");                        sb.Append("\"FilePath\":" + "\"" + paths + "\"");                        sb.Append(",");                        sb.Append("\"FileName\":" + "\"" + names + "\"");                        sb.Append(",");                        sb.Append("\"FileTitle\":" + "\"" + title + "\"");                        sb.Append(",");                        sb.Append("\"FileGuid\":" + "\"" + FILEGUID + "\"");                        sb.Append("}");                        sb.Append("}");                    }                    else                    {                        resultcode = "1003";                        errormsg = "不支持的文件类型：" + strFileExtension;                        sb.Append("{\"resultcode\":" + "\"" + resultcode + "\"");                        sb.Append(",");                        sb.Append("\"errormsg\":" + "\"" + errormsg + "\"");                        sb.Append(",");                        sb.Append("\"datas\":" + "{");                        sb.Append("\"FilePath\":" + "\"" + paths + "\"");                        sb.Append(",");                        sb.Append("\"FileName\":" + "\"" + names + "\"");                        sb.Append(",");                        sb.Append("\"FileTitle\":" + "\"" + title + "\"");                        sb.Append(",");                        sb.Append("\"FileGuid\":" + "\"" + FILEGUID + "\"");                        sb.Append("}");                        sb.Append("}");                    }                    context.Response.Write(sb.ToString());                }            }        }