这个是.aspx页面中用来上传文件的接口，适用于App接口

                int maxlength =  *  * ;//3M

                picPath = Server.MapPath(".........");

                HttpFileCollection postfile = Context.Request.Files;

                for (int i = ; i < postfile.Count; i++)

                {

                    HttpPostedFile file = postfile[i];

                    if (!CheckType(GetExtension(file.FileName).Substring()))

                    {

                        r.success = false;

                        r.message = "文件类型不正确，上传失败！";

                    }

                    if (file.ContentLength > maxlength)

                    {

                        r.success = false;

                        r.message = "上传文件的大小超过了3MB的最大容量！请压缩后再上传！";

                    }

                    string strNewPath = DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.ToLongTimeString().Replace(":", "") + DateTime.Now.Millisecond + GetExtension(file.FileName);

                    file.SaveAs(picPath +"/"+ strNewPath);

                    strNewPath = strNewPath.Replace("\\", "/");

                    urlPath = picServer + strNewPath;

                    originalname = GetOriginalName(file.FileName);

                    if (originalname == "")

                    {

                        originalname = file.FileName;

                    }

                    string newName = GetOriginalName1(strNewPath);

                    file.SaveAs(Server.MapPath(".") + "/" + Path.GetFileName(file.FileName));

                }