The development process, often encounter import and export data needs, this blog explains how to use EPPlus components in .NET Core import and export in Excel
EPPlus：
EPPlus is using Open Office XML format (xlsx) .net development library to read and write Excel 2007/2010 files, can read and write Excel 2007/2010 file that can run on Windows, Linux and Mac, the official website address: HTTPS: // Archive. codeplex.com/
In the .net core can also be used NOPI operating Excel, this does not describe.
Use EPPlus Operation Excel:
1, the introduction EPPlus package , run the installation package dependencies in the Management Console:
1 PM> Install-Package EPPlus.Core -Version 1.5.4
2, export Excel
① When using EF Core operating database, the data set used to facilitate export List.
② injection IHostingEnvironment in the constructor of the controller to get the site's root directory path, in order to set export Excel file path.
. 1 public IActionResult OutputExcel ( ) 2 { . 3 // Data Source list is set . 4 var Query = ( from U in _context.UserInfo . 5 SELECT new new . 6 { . 7 u.UId, . 8 u.UName, . 9 u.UPws, 10 U. UEmail, . 11 u.UTel 12 is .}) ToList (); 13 is // specified export Excel file path 14 String= sWebRootFolder _hostingEnv.WebRootPath; 15 // filename 16 String sFileName = $ @ " Test Export DateTime.Now.ToString {( " yyyyMMddHHmmss " )} XLSX. " ; . 17 // The two strings into a path 18 is var = path Path.Combine (sWebRootFolder, sFileName); 19 // create a file object 20 FileInfo file = new new FileInfo (path); 21 // If the file exists 22 IF (the File.exists) 23 { 24- // delete files 25 File.Delete (); 26 is // re-create the file objects 27 File = new new the FileInfo (path); 28 } 29 // Create Object ExcelPackage 30 the using (ExcelPackage Package = new new ExcelPackage (File)) 31 is { 32 // Add New sheet to the workbook 33 is ExcelWorksheet worksheet = package.Workbook.Worksheets.Add ( " the UserInfo " ); 34 is // the list set loaded onto the work table, the print head table 35 worksheet.Cells.LoadFromCollection (Query, to true ); 36 / / save Excel 37 [ package.Save (); 38 is } // release resources 39 return View ( " Index " ); 40 }
ExcelPackage inlet EPPlus class is class, parses an Excel file, represents an object to generate ExcelWorkbook Excel.
ExcelPackage class implements IDisposable, you can use using object-release.
ExcelWorksheet class can be set to Excel table style, but set the Excel spreadsheet style will increase the burden of memory, the export may slow down.
3, import Excel
Import, export Excel method, bloggers are using the Ajax request, when importing Excel, fackpath path problem will occur when incoming spool file path, file after the first imported directly saved in the root directory, and then import the root directory files
JavaScript code:
. 1 $ ( "# IExcel") the Click (. Function () { 2 var FormData = new new FormData (); // Create an empty object FormData by the constructor . 3 formdata.append ( 'File', $ ( "# Import") [0] .files [0]); // be added by the append () method of the data . 4 $ .ajax ({ . 5 type: "POST" , . 6 URL: "/ the Main / ImportExcel" , . 7 contentType: to false , // Do not request to set Content-Type header . 8 the processData: to false , // do not process data to be transmitted . 9 data: FormData, 10 success: function (data) { 11 alert(data.message); 12 }, 13 error: function () { 14 alert("导入失败！"); 15 } 16 }) 17 })
When using FormData object transmission data shall be provided to the browser not to process the data and settings request sent Content-Type header, otherwise the error JS: Uncaught TypeError: Illegal invocation
C # code:
. 1 public IActionResult ImportExcel () 2 { . 3 the try . 4 { . 5 // file to import first uploaded to the root directory 6 // Get pass over the front end of the file . 7 var Files = Request.Form.Files; . 8 var filePath = "" ; . 9 the foreach ( var Item in files) 10 { . 11 // get file name 12 is filePath = item.FileName; 13 is // specified file upload path 14 = + $ _hostingEnv.WebRootPath filePath @ " \ {filePath} " ; 15 // create a stream file 16 the using (FS = the FileStream System.IO.File.Create (filePath)) . 17 { 18 is // Copy the contents of the file to upload stream object . 19 item.CopyTo (FS); 20 is // clear the buffer for this flow and cause any data is written to the buffer 21 is fs.Flush (); 22 is } 23 is } 24 // Create a file object 25 the FileInfo file = new new the FileInfo (filePath); 26 IF (File =!null ) 27 { 28 // create objects ExcelPackage 29 the using (ExcelPackage Package = new new ExcelPackage (File)) 30 { 31 is // access Excel table the first table 32 ExcelWorksheet package.Workbook.Worksheets Worksheet = [ . 1 ]; 33 is // number of rows acquired table 34 is int the rowCount = worksheet.Dimension.Rows; 35 // number of columns of the table acquired 36 int ColCount = worksheet.Dimension.Columns; 37 [ var User = new new List<UserInfo>(); 38 for (int row = 1; row <= rowCount; row++) 39 { 40 UserInfo userinfo = new UserInfo(); 41 //指定行列赋值 42 userinfo.UName = worksheet.Cells[row, 2].Value.ToString(); 43 userinfo.UPws = worksheet.Cells[row, 3].Value.ToString(); 44 userinfo.UEmail = worksheet.Cells[row, 4].Value.ToString(); 45 = worksheet.Cells userinfo.UTel [Row, . 5 ] .Value.ToString (); 46 is // save data to entity 47 _context.UserInfo.Add (UserInfo); 48 _context.SaveChanges (); 49 } 50 return Json ( new new {Message = " import successful! " }); 51 is } 52 is } 53 is return null ; 54 is } 55 the catch (Exception EX) 56 is { 57 is return Json (new new {Message = " Import failed! " + EX}); 58 } 59 }
ExcelWorkbook class represents an Excel document, which corresponds to the respective Worksheets Sheet properties of Excel. Worksheets property is automatically created, do not worry null pointer exception, but the Count may be zero. Note: When obtaining specific Sheet, the index number starting at 1.
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