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/// <summary>
        /// 上传文件 方法
        /// </summary>
        /// <param name="fileNamePath"></param>
        /// <param name="toFilePath"></param>
        /// <returns>返回上传处理结果   格式说明： 0|file.jpg|msg   成功状态|文件名|消息    </returns>
        public string UpLoadFile(string fileNamePath, string toFilePath)
         {
            try
             {
                //获取要保存的文件信息
                 FileInfo file = new FileInfo(fileNamePath);
                //获得文件扩展名
                string fileNameExt = file.Extension;

                //验证合法的文件
                if (CheckFileExt(fileNameExt))
                 {
                    //生成将要保存的随机文件名
                    string fileName = GetFileName() + fileNameExt;
                    //检查保存的路径 是否有/结尾
                    if (toFilePath.EndsWith("/") == false) toFilePath = toFilePath + "/";

                    //按日期归类保存
                    string datePath = DateTime.Now.ToString("yyyyMM") + "/" + DateTime.Now.ToString("dd") + "/";
                    if (true)
                     {
                         toFilePath += datePath;
                     }

                    //获得要保存的文件路径
                    string serverFileName = toFilePath + fileName;
                    //物理完整路径                    
                    string toFileFullPath = HttpContext.Current.Server.MapPath(toFilePath);
                    
                    //检查是否有该路径   没有就创建
                    if (!Directory.Exists(toFileFullPath))
                     {
                         Directory.CreateDirectory(toFileFullPath);
                     }

                    //将要保存的完整文件名                
                    string toFile = toFileFullPath + fileName;

                    ///创建WebClient实例      
                     WebClient myWebClient = new WebClient();
                    //设定windows网络安全认证   方法1
                     myWebClient.Credentials = CredentialCache.DefaultCredentials;
                    ////设定windows网络安全认证   方法2
                    //NetworkCredential cred = new NetworkCredential("UserName", "UserPWD");
                    //CredentialCache cache = new CredentialCache();
                    //cache.Add(new Uri("UploadPath"), "Basic", cred);
                    //myWebClient.Credentials = cache;

                    //要上传的文件      
                     FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
                    //FileStream fs = OpenFile();      
                     BinaryReader r = new BinaryReader(fs);
                    //使用UploadFile方法可以用下面的格式      
                    //myWebClient.UploadFile(toFile, "PUT",fileNamePath);      
                    byte[] postArray = r.ReadBytes((int)fs.Length);
                     Stream postStream = myWebClient.OpenWrite(toFile, "PUT");
                    if (postStream.CanWrite)
                     {
                         postStream.Write(postArray, 0, postArray.Length);
                     }
                    else
                     {
                        return "0|" + serverFileName + "|" + "文件目前不可写";
                     }
                     postStream.Close();


                    return "1|" + serverFileName + "|" + "文件上传成功";
                 }
                else
                 {
                    return "0|errorfile|" + "文件格式非法";
                 }
             }
            catch (Exception e)
             {
                return "0|errorfile|" + "文件上传失败,错误原因：" + e.Message;
             }
         }

ajaxUpFile.ashx     服务端处理

Default.aspx     用户提交

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