Optimal way to Read an Excel file xls xlsx

Question

I know that there are different ways to read an Excel file    Iterop Oledb Open Xml SDK   Compatibility is not a question because the program will be executed in a controlled environment   My Requirement   Read a file to a DataTable   CUstom Entities  I don t know how to make dynamic properties fields to an object column names will be variating in an Excel file    Use DataTable Custom Entities to perform some operations using its data   Update DataTable with the results of the operations  Write it back to excel file   Which would be simpler   Also if possible advice me on custom Entities  adding properties fields to an object dynamically

User · Answer

Try to use this free way to this  https   freenetexcel codeplex com   Workbook workbook   new Workbook      workbook LoadFromFile         parts xls  ExcelVersion Version97to2003      Initialize worksheet  Worksheet sheet   workbook Worksheets 0     DataTable dataTable   sheet ExportDataTable

User · Answer

Try to use Aspose cells library  not free  but trial is enough to read   it is quite good  Install-package Aspose cells  There is sample code   using Aspose Cells  using System   namespace ExcelReader       class Program               static void Main string   args                           Replace path for your file             readXLS   C  MyExcelFile xls       or    xlsx              Console ReadKey                       public static void readXLS string PathToMyExcel                          Open your template file              Workbook wb   new Workbook PathToMyExcel                  Get the first worksheet              Worksheet worksheet   wb Worksheets 0                  Get cells             Cells cells   worksheet Cells                  Get row and column count             int rowCount   cells MaxDataRow              int columnCount   cells MaxDataColumn                  Current cell value             string strCell                    Console WriteLine String Format  rowCount  0   columnCount  1    rowCount  columnCount                 for  int row   0  row  lt   rowCount  row       Numeration starts from 0 to MaxDataRow                               for  int column   0  column  lt   columnCount  column        Numeration starts from 0 to MaxDataColumn                                       strCell                           strCell   Convert ToString cells row  column  Value                       if  String IsNullOrEmpty strCell                                                 continue                                            else                                                  Do your staff here                         Console WriteLine strCell

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Using OLE Query  it s quite simple  e g  sheetName is Sheet1    DataTable LoadWorksheetInDataTable string fileName  string sheetName                   DataTable sheetData   new DataTable        using  OleDbConnection conn   this returnConnection fileName                conn Open              retrieve the data using data adapter        OleDbDataAdapter sheetAdapter   new OleDbDataAdapter  select   from      sheetName         conn          sheetAdapter Fill sheetData          conn Close                                      return sheetData     private OleDbConnection returnConnection string fileName        return new OleDbConnection  Provider Microsoft Jet OLEDB 4 0 Data Source     fileName      Jet OLEDB Engine Type 5 Extended Properties   Excel 8 0           For newer Excel versions   return new OleDbConnection  Provider Microsoft ACE OLEDB 12 0 Data Source     fileName     Extended Properties Excel 12 0       You can also use Excel Data Reader an open source project on CodePlex  Its works really well to export data from Excel sheets    The sample code given on the link specified   FileStream stream   File Open filePath  FileMode Open  FileAccess Read      1  Reading from a binary Excel file   97-2003 format    xls  IExcelDataReader excelReader   ExcelReaderFactory CreateBinaryReader stream           2  Reading from a OpenXml Excel file  2007 format    xlsx  IExcelDataReader excelReader   ExcelReaderFactory CreateOpenXmlReader stream           3  DataSet - The result of each spreadsheet will be created in the result Tables DataSet result   excelReader AsDataSet            4  DataSet - Create column names from first row excelReader IsFirstRowAsColumnNames   true  DataSet result   excelReader AsDataSet       5  Data Reader methods while  excelReader Read        excelReader GetInt32 0        6  Free resources  IExcelDataReader is IDisposable  excelReader Close      Reference  How do I import from Excel to a DataSet using Microsoft Office Interop Excel

User · Answer

If you can restrict it to just  Open Office XML format    xlsx files  then probably the most popular library would be EPPLus   Bonus is  there are no other dependencies  Just install using nuget   Install-Package EPPlus

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Take a look at Linq-to-Excel  It s pretty neat   var book   new LinqToExcel ExcelQueryFactory   File xlsx     var query       from row in book Worksheet  Stock Entry       let item   new               Code   row  Code   Cast lt string gt             Supplier   row  Supplier   Cast lt string gt             Ref   row  Ref   Cast lt string gt               where item Supplier     Walmart      select item    It also allows for strongly-typed row access too

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Read from excel  modify and write back        lt summary gt       Reads an excel file and converts it into dataset with each sheet as each table of the dataset      lt  summary gt       lt param name  filename  gt  lt  param gt       lt param name  headers  gt If set to true the first row will be considered as headers lt  param gt       lt returns gt  lt  returns gt  public DataSet Import string filename  bool headers   true        var  xl   new Excel Application        var wb    xl Workbooks Open filename       var sheets   wb Sheets      DataSet dataSet   null      if  sheets    null  amp  amp  sheets Count    0                dataSet   new DataSet            foreach  var item in sheets                        var sheet    Excel Worksheet item              DataTable dt   null              if  sheet    null                                dt   new DataTable                    var ColumnCount     Excel Range sheet UsedRange Rows 1  Type Missing   Columns Count                  var rowCount     Excel Range sheet UsedRange Columns 1  Type Missing   Rows Count                   for  int j   0  j  lt  ColumnCount  j                                          var cell    Excel Range sheet Cells 1  j   1                       var column   new DataColumn headers   cell Value   string Empty                       dt Columns Add column                                      for  int i   0  i  lt  rowCount  i                                          var r   dt NewRow                        for  int j   0  j  lt  ColumnCount  j                                                  var cell    Excel Range sheet Cells i   1    headers   1   0   j   1                           r j    cell Value                                            dt Rows Add r                                                dataSet Tables Add dt                        xl Quit        return dataSet        public string Export DataTable dt  bool headers   false                var wb    xl Workbooks Add            var sheet    Excel Worksheet wb ActiveSheet            process columns         for  int i   0  i  lt  dt Columns Count  i                          var col   dt Columns i                 added columns to the top of sheet             var currentCell    Excel Range sheet Cells 1  i   1               currentCell Value   col ToString                currentCell Font Bold   true                process rows             for  int j   0  j  lt  dt Rows Count  j                                  var row   dt Rows j                     added rows to sheet                 var cell    Excel Range sheet Cells j   1   1  i   1                   cell Value   row i                             currentCell EntireColumn AutoFit                      var fileName   somepath somefile xlsx            wb SaveCopyAs fileName            xl Quit            return fileName

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I realize this question was asked nearly 7 years ago but it s still a top Google search result for certain keywords regarding importing excel data with C   so I wanted to provide an alternative based on some recent tech developments   Importing Excel data has become such a common task to my everyday duties  that I ve streamlined the process and documented the method on my blog  best way to read excel file in c    I use NPOI because it can read write Excel files without Microsoft Office installed and it doesn t use COM  or any interops   That means it can work in the cloud   But the real magic comes from pairing up with NPOI Mapper from Donny Tian because it allows me to map the Excel columns to properties in my C  classes without writing any code   It s beautiful   Here is the basic idea   I create a  net class that matches maps the Excel columns I m interested in           class CustomExcelFormat                        Column  District                public int District   get  set                  Column  DM                public string FullName   get  set                  Column  Email Address                public string EmailAddress   get  set                  Column  Username                public string Username   get  set                 public string FirstName                               get                                       return Username Split      0                                                public string LastName                               get                                       return Username Split      1                                               Notice  it allows me to map based on column name if I want to    Then when I process the excel file all I need to do is something like this           public void Execute string localPath  int sheetIndex                        IWorkbook workbook              using  FileStream file   new FileStream localPath  FileMode Open  FileAccess Read                                 workbook   WorkbookFactory Create file                              var importer   new Mapper workbook               var items   importer Take lt CustomExcelFormat gt  sheetIndex               foreach var item in items                                var row   item Value                  if  string IsNullOrEmpty row EmailAddress                       continue                   UpdateUser row                              DataContext SaveChanges                Now  admittedly  my code does not modify the Excel file itself   I am instead saving the data to a database using Entity Framework  that s why you see  UpdateUser  and  SaveChanges  in my example    But there is already a good discussion on SO about how to save modify a file using NPOI

[c#] Optimal way to Read an Excel file (.xls/.xlsx)

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