$.ajaxFileUpload({
   type: "post",       //請求類型：post或get,當要使用data提交自定義參數時一定要設置為post
   url: "/Shared/Upload",     //文件上傳的服務器端請求地址
   secureuri: false,      //是否啟用安全提交，一般默認為false就行，不用特殊處理
   fileElementId: "filePicture",   //文件上傳控件的id input type="file" id="filePicture" name="filePicture" accept=".jpg,.jpeg,.png,.bmp" onchange="filePictureChange()" />
   dataType: "json",      //返回值類型，一般設置為json，還支持html\xml\script類型
   data: { "id": "1", "name": "test" }, //用于post請求提交自定義參數
   success: function (data, status) {  //服務器成功響應處理函數
   },
   error: function (data, status, e) { //服務器響應失敗處理函數
   }
  });

function filePictureChange() {
   $.ajaxFileUpload({
    url: "/Shared/Upload", //用于文件上傳的服務器端請求地址
     type: "post",
    secureuri: false, //一般設置為false
    fileElementId: "filePicture", //文件上傳空間的id屬性
     dataType: "json", //返回值類型 一般設置為json
    success: function (data, status) { //服務器成功響應處理函數
      alert(data.fileName);
     alert(data.filePath);
     alert(data.fileSize);
    },
    error: function (data, status, e){ //服務器響應失敗處理函數
      alert(e);
    }
   });
  };

/// summary>
  /// 附件上傳
  /// /summary>
  /// returns>/returns>
  public ActionResult Upload()
  {
   HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;
   if (files.Count == 0) return Json("Faild", JsonRequestBehavior.AllowGet);
   MD5 md5Hasher = new MD5CryptoServiceProvider();
   /*計算指定Stream對象的哈希值*/
   byte[] arrbytHashValue = md5Hasher.ComputeHash(files[0].InputStream);
   /*由以連字符分隔的十六進制對構成的String，其中每一對表示value中對應的元素；例如“F-2C-4A”*/
   string strHashData = System.BitConverter.ToString(arrbytHashValue).Replace("-", "");
   string FileEextension = Path.GetExtension(files[0].FileName);
   string uploadDate = DateTime.Now.ToString("yyyyMMdd");
   string virtualPath = string.Format("/Data/ComponentAttachments/{0}/{1}{2}", uploadDate, strHashData, FileEextension);
   string fullFileName = Server.MapPath(virtualPath);
   //創建文件夾，保存文件
    string path = Path.GetDirectoryName(fullFileName);
   Directory.CreateDirectory(path);
   if (!System.IO.File.Exists(fullFileName))
   {
    files[0].SaveAs(fullFileName);
   }
   string fileName = files[0].FileName.Substring(files[0].FileName.LastIndexOf("\\") + 1, files[0].FileName.Length - files[0].FileName.LastIndexOf("\\") - 1);
   string fileSize = GetFileSize(files[0].ContentLength);
   return Json(new { FileName = fileName, FilePath = virtualPath, FileSize = fileSize }, "text/html", JsonRequestBehavior.AllowGet);
  }
  /// summary>
  /// 獲取文件大小
  /// /summary>
  /// param name="bytes">/param>
  /// returns>/returns>
  private string GetFileSize(long bytes)
  {
   long kblength = 1024;
   long mbLength = 1024 * 1024;
   if (bytes  kblength)
    return bytes.ToString() + "B";
   if (bytes  mbLength)
    return decimal.Round(decimal.Divide(bytes, kblength), 2).ToString() + "KB";
   else
    return decimal.Round(decimal.Divide(bytes, mbLength), 2).ToString() + "MB";
  }

 uploadHttpData: function (r, type) {
  var data = !type;
  data = type == "xml" || data ? r.responseXML : r.responseText;
  // If the type is "script", eval it in global context
  if (type == "script")
   jQuery.globalEval(data);
  // Get the JavaScript object, if JSON is used.
  if (type == "json")
   eval("data = " + data);
   //eval("data = \"" + data + "\"");
  // evaluate scripts within html
  if (type == "html")
   jQuery("div>").html(data).evalScripts();

  return data;
 },
 handleError: function (s, xhr, status, e) {
  // If a local callback was specified, fire it
  if (s.error) {
   s.error.call(s.context || s, xhr, status, e);
  }

  // Fire the global callback
  if (s.global) {
   (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
  }
 }