$.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(chuàng)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]);
 }
 }