C # Implement multi-file uploads, write to folders, get file information and download files and delete files

Front desk:. js

//Uploading Attachmentsfunctionuploadattachment () {if($ ("#Tipbind"). attr (' checked ')) {        varIP = $ ("#TunBandIP"). Val (); if($.trim (IP) = = 0) {            return$.messager.show ({title: ' Hint ', msg: ' Please select IP First ' }); }        $(' #ImprotDlg '). Dialog (' Open '));        Uploadfy (IP); $("#T_ExcelName"). Val (""); $("#T_SheetName"). Val (""); }    Else{$.messager.show ({title:' Hint ', msg: ' Only the bound IP can upload attachments ' }); }}varOnComplete =false;functionuploadfy (IP) {$ ("#uploadify"). uploadify ({' swf ': '/scripts/uploadify/uploadify.swf ',        ' Uploader ': '/ajaxterminalinfo/uploadattachments.cspx ',        ' FormData ': {' IP ': IP},' Folder ': '/attachments ',        ' Queueid ': ' Filequeue ',        ' method ': ' Get ',        ' Auto ':false,        ' SizeLimit ': 20480000,        ' Multi ':true,        ' Filedesc ': ' Please select File ',        ' Fileext ': ' * ',        ' Width ': 110,        ' Height ': 28,        ' ButtonText ': ' Please select File ',        ' Scriptdata ': {},        ' OnSelect ':function(E, Queueid, fileobj) {qId=Queueid; },        ' Onuploadsuccess ':function(file, data, response) {vardatamsg = eval ("val= (" + Data + ")"); if(datamsg. Success) {$.messager.show ({title:Prompted, Msg:datamsg.                Success}); $(' #ImprotDlg '). Dialog (' Close '); } Else{$.messager.show ({title:Prompted, Msg:datamsg.            Error}); } oncomplete=true; },        ' Onuploaderror ':function(file, ErrorCode, ErrorMsg, errorstring) {if(File.size > 20480000{$.messager.show ({title:' Hint ', msg: ' Upload file cannot exceed 20M ' }); }        },        ' OnCancel ':function(file) {}});//Start uploadingfunctionUploadFile () {varFileName = $ ("#T_ExcelName"). Val (); if(filename = = ""{$.messager.show ({title:' Hint ', msg: ' Please select Upload file! ‘ }); return; }    $(' #uploadify '). Uploadify (' upload ', ' * '));}//Cancel UploadfunctionCanceluploadfile () {$ (' #uploadify '). Uploadify (' Cancel ', ' * '); $(' #ImprotDlg '). Dialog (' Close ');}//View Attachmentsfunctionshowattachment () {varIP = $ ("#TunBandIP"). Val (); if($.trim (IP) = = 0) {        return$.messager.show ({title: ' Hint ', msg: ' Please select IP First ' }); }    $("#attachmentDlg"). Dialog (' Open '); varDgobj ={queryparams: {ip:ip}, Singleselect:true, URL:'/ajaxterminalinfo/getattachmentsbyip.cspx ', Method:' Get ', border:false, toolbar: [{text:Download, Iconcls:' Icon-import ', Handler:function () {                varRow = $ ("#dg"). DataGrid (' getchecked '); if(Row.length = = 0) {                    return$.messager.show ({title: ' Hint ', msg: ' Please select file to download First ') }); }                 for(vari = 0; i < row.length; i++) {                    $(' #attachmentForm '). attr (' action ', '/ajaxterminalinfo/downloadattachment.cspx?filepath= ' + row[i]. FilePath + "&filename=" +Row[i].                    FileName); $(' #attachmentForm '). Submit (); }}}, {text:Delete, Iconcls:' Icon-no ', Handler:function() {alert (1)}}], columns: [[{field:' CK ', checkbox:true}, {field:' filename ', title: ' filename ', width:310, align: ' left ', halign: ' Center '}, {field:' Uploaddatetime ', title: ' Upload Date ', width:120, align: ' center ' }        ]]    }; $("#dg"). DataGrid (Dgobj);}

<summary>
deleting files
</summary>
<param name= "filepath" ></param>
<param name= "filename" ></param>
<returns></returns>
[Action]
[SessionMode (Sessionmode.support)]
Public Object deleteattachment (string filepath, string filename)
{
Message message = new Message ();
Try
{
Judging if the file is not present
if (file.exists (filepath))
{
Delete if it exists
File.delete (filepath);
Message. Success = "Delete file succeeded";
Message.data = true;
}
Else
{
Message. Success = "File does not exist";
Message.data = false;
}
return jsonconvert.serializeobject (message);
}
catch (Exception e)
{
Log. Debug ("Cause of Error:" + e.message);
Message. Error = "Delete file failed:" + e.message;
Message.data = false;
return jsonconvert.serializeobject (message);
}
}

Backstage:. CS

/// <summary>        ///Uploading Attachments/// </summary>        /// <returns></returns>[Action] [SessionMode (sessionmode.support)] Public Objectuploadattachments () {varMessage =NewMessage (); Try{httppostedfile file= httpcontext.current.request.files["Filedata"]; varIP = httpcontext.current.request.params["IP"]; stringPath ="/attachments/"+ IP +"/";//relative Path                if(File! =NULL&& file. ContentLength >0)                {                    stringSavepath =Path.Combine (HttpContext.Current.Server.MapPath (Path)); if(!directory.exists (Savepath))                    Directory.CreateDirectory (Savepath); File. SaveAs (Savepath+file.                    FileName); Message. Success="Upload Successful"; }                Else{message.} Error="the file cannot be empty"; }            }            Catch(Exception e) {log. Debug ("cause of error:"+e.message); Message. Error="cause of error:"+E.message; Throw; }            returnjsonconvert.serializeobject (message); }        /// <summary>        ///         /// </summary>        /// <returns></returns>[Action] [SessionMode (sessionmode.support)] Public ObjectGetattachmentsbyip (stringIP) {            Try            {                stringPath ="/attachments/"+ IP +"/";//relative Path                stringSavepath =Path.Combine (HttpContext.Current.Server.MapPath (Path)); varDgdata =NewDatagriddata<diyfile>(); string[] FileNames =Directory.GetFiles (Savepath); foreach(varFileNameinchfileNames) {                    varfi =NewFileInfo (fileName); varFileInfo =NewDiyfile (); FileInfo. FileName=fi.                    Name; FileInfo. FilePath=FileName; FileInfo. Uploaddatetime=fi.                    LastAccessTime;                DGDATA.ROWS.ADD (FileInfo); } dgdata.total=Filenames.count (); varDgjson =Jsonconvert.serializeobject (Dgdata); returnDgjson; }            Catch(Exception e) {log. Debug ("cause of error:"+e.message); Throw; }} [Action] [SessionMode (sessionmode.support)] Public voidDownloadattachment (stringFilePathstringfilename) {            Try            {                using(varFS =NewFileStream (filepath, FileMode.OpenOrCreate)) {                    varbytes =New byte[(int) fs.                    Length]; Fs. Read (Bytes,0, Bytes.                    Length); Fs.                    Close ();                    HttpContext.Current.Response.Clear (); HttpContext.Current.Response.ContentType="Application/octet-stream"; //notifies the browser to download a file instead of opening itHttpContext.Current.Response.AddHeader ("content-disposition","attachment; Filename="+httputility.urlencode (filename, Encoding.UTF8));                    HttpContext.Current.Response.BinaryWrite (bytes);                    HttpContext.Current.Response.Flush (); Fs.                Close (); }            }            Catch(Exception e) {log. Debug ("cause of error:"+e.message); Throw; }        }

C # Implement multi-file uploads, write to folders, get file information and download files and delete files