Asp.net implements asynchronous File Upload Based on ajaxfileupload. js,

Asp.net implements asynchronous File Upload Based on ajaxfileupload. js,

Front-end code:

/* Modify the Avatar * // upload function _ SC () {$ (". ckfile ").html (" ").css (" color "," #535353 "); $ (" # _ userImgPath "). val (""); var str = $ ("# file "). val (); if ($. trim (str) = "") {$ (". ckfile "cmd.html (" select a file. "2.16.css (" color "," red "); return false;} else {var postfix = str. substring (str. lastIndexOf (". ") + 1 ). toUpperCase (); if (postfix = "JPG" | postfix = "JPEG" | postfix = "PNG" | postfix = "GIF" | postfix = "BMP") {$ ('# showimg '). attr ('src', 'images/loading.gif '). attr ("title", "Uploading... please wait... "); Var path =" Upload/UserImg "; $. ajaxFileUpload ({url: '/Upload. aspx? Path = Upload | UserImg & shape = 100*100 ', secureuri: false, fileElementId: 'file', ype: 'text', success: function (msg) {if (msg. lastIndexOf (path) =-1) {$ (". ckfile ").html(msg).css (" color "," red ");} else {$ ('# showimg '). attr ('src', msg ). attr ("title", "my avatar"); $ ("# _ userImgPath "). val (msg) ;}}) ;}else {$ (". ckfile "cmd.html (" File Format error. ").Css (" color "," red "); return false ;}} background code: using System; using System. collections. generic; using System. linq; using System. web; using System. web. UI; using System. web. UI. webControls; using SS. upload; using WFC. fenxiao; namespace wanfangcheng {public partial class Upload: BasePage {// file size: 1024 kb private long size = 1024; // file type private string type = ". jpg |. jpeg |. png |. gif |. bmp "; // Save the name strin G name = ""; // save path private string path = @ "Upload/UserImg"; // save size private string shape = "100*100 "; protected void Page_Load (object sender, EventArgs e) {HttpFileCollection files = Request. files; if (files! = Null & files. Count> 0) {name = BaseRole. Instance. UserId. ToString (); if (Request. QueryString ["size"]! = Null) {size = Convert. ToInt32 (Request. QueryString ["size"]);} if (Request. QueryString ["path"]! = Null) {path = Request. queryString ["path"]. toString (). trim (). replace ('|', '/');} if (Request. queryString ["name"]! = Null) {name = Request. QueryString ["name"]. ToString (). Trim ();} if (Request. QueryString ["shape"]! = Null) {shape = Request. queryString ["shape"]. toString (). trim () ;}uploadmethod (files );}} /// <summary> /// upload an image /// </summary> /// <param name = "hc"> </param> public void uploadMethod (HttpFileCollection hc) {HttpPostedFile _ file = hc [0]; // file size long _ size = _ file. contentLength; if (_ size <= 0) {Response. write ("file error. "); Response. End (); return;} if (size * 1024 <_ size) {Response. Write (" the file is too large, and the maximum value is "+ size +" KB. "); Response. end (); return;} // file name string _ name = _ file. fileName; // File Format string _ tp = System. IO. path. getExtension (_ name ). toLower (); if (type. indexOf (_ tp) =-1) {Response. write ("File Format error. "); Response. end (); return;} // save path string _ path = HttpContext. current. server. mapPath (path) + @ "/" + name + _ tp; try {int w = Convert. toInt32 (shape. split ('*') [0]); int h = Convert. toInt32 (shape. split ('*') [1]); ImageHelper. cutForCustom (_ file, _ path, w, h, 50); Response. write (path + @ "/" + name + _ tp);} catch (Exception) {Response. write ("sorry, an error occurred. "); Response. End ();}}}}