Excel to csv without excel - Word и Excel - помощь в работе с программами

Need to convert a .xls or .xlsx to a .csv without the use of Excel in an C#/ASP.net web app. The application is currently using the NPOI.dll for some functionality but I do not see any info on the codeplex wiki for NPOI for that particular functionality. Does anyone have any suggestions?

Thanks

asked Sep 27, 2011 at 17:53

There are libraries ( Excel Data Reader, for eg) that let you read excel. Once you are able to read data, writing to csv should be simple.

answered Sep 27, 2011 at 18:04

Bala RBala R

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ADODB.NET can be used to treat the Excel files as datasource.

//string ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;";
string ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=Excel 12.0;";

ConnectionString = string.Format(ConnectionString, @"FullPathToExcelFile");

OleDbConnection conn = new OleDbConnection(ConnectionString);
conn.Open();

OleDbCommand cmdSelect = new OleDbCommand("SELECT * FROM [Sheet1$]", conn);
OleDbDataAdapter oleDBAdapter = new OleDbDataAdapter();
oleDBAdapter.SelectCommand = cmdSelect;

DataSet myDataset = new DataSet();
oleDBAdapter.Fill(myDataset);
conn.Close(); 

// Do whatever with data in myDataset including export to csv...

answered Sep 27, 2011 at 18:27

amit_gamit_g

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Have a look at the FileHelpers library. It will do exactly what you want.

With FileHelpers, you can read from Excel files and write to csv or flat text files. And it’s object oriented! All you have to do is to annotate classes with some attributes so that they match the source excel file.

Consider this example:

[DelimitedRecord("|")]
public class CustomersVerticalBar {
   public string CustomerID;
   public string CompanyName;
   ...
}

Read using this:

ExcelStorage provider = new ExcelStorage(typeof(CustomersVerticalBar));

provider.StartRow = 3;
provider.StartColumn = 2;

provider.FileName = "Customers.xls";

CustomerVerticalBar[] res = (CustomerVerticalBar[]) provider.ExtractRecords();

Example taken from here: http://filehelpers.sourceforge.net/example_exceldatalink.html

answered Sep 27, 2011 at 18:06

Mikael ÖstbergMikael Östberg

17k6 gold badges61 silver badges79 bronze badges

.xls is a proprietary binary format which cannot be read in plain text format, so you will need office or Libre Office or something to read that… .xlsx is an xml based format, and should be possible just by parsing through the DOM… but you would still be manually iterating through each value and manually delimiting, etc. Have you considered using an xslt?

answered Sep 27, 2011 at 17:55

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XLSX (EXCEL) to CSV Converter

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Convert to XLSX

xlsx

Office Open XML Worksheet Sheet

XLSX is a file format created with Microsoft Excel, version from 2007 and younger. This file is a spreadsheet. All data distributed document and stored in the cells. Each cell has a unique address, which is denoted by the letters and Arabic numerals. XLSX file format is based on the Open XML. To reduce the size of the file is compressed ZIP.

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csv

Comma-Separated Values

Is a text format used for representing tabular data. Each file line is located on a separate line in the table. The values of the columns are separated by a delimiter, most often a comma. However, other symbols can be used as delimiters as well.

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XLSX Document Format

XLSX Converter

XLSX is a Excel file type developed by Microsoft as part of Office 2007. XLSX was developed by Microsoft as part of their Office 2007 development which focused on trying to allow information to be more readily shared between different programs whilst also reducing the file size footprint which had been increasing year on year.

XLSX files have the same functionality as XLS files in that they can include shapes, charts, formula, macros and more. The difference between the two is more technical. The XLSX file data is stored in the Open XML format which stores data as separate files and is zipped to reduce space. This is compared to the XLS file type which stores the data in a single binary file. XLSX files can be opened by various programs including various OpenOffice programs and on the web with applications like Google Drive.

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CSV Document Format

CSV Converter

CSV is a type of file for saving spreadsheet data which is recognised by almost all spreadsheet programs. CSV stands for ‘comma separated values’, and if you open a CSV file outside a spreadsheet program, you will see plain text with the data separated, usually by commas, semi-colons, or quotation marks. If you open that same CSV file in a spreadsheet program like Microsoft Excel, Apple Numbers, Google Sheets or LibreOffice Calc, each separated piece of data should then be transferred into an individual cell.

Because CSV files are recognised by almost all spreadsheet programs, they are used as a simple way to export data or transfer it between different programs. However, CSV is a plain text format, so CSV files cannot include advanced spreadsheet functions like charts, formulas, filters, or formatting. There is also not currently a universal open standard for all CSV files.

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How to convert a XLSX to a CSV file?

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There are several ways you can convert XLSX to CSV, including using Excel or conversion tools like Zamzar. In Excel, you can open an XLSX file and then save it as a CSV, or comma delimited, file. You may also be able to open your Excel file in another program like LibreOffice or Google Drive before saving it as a CSV.

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There are a few ways you can convert XLXS to CSV without losing data, including with the free tool on Zamzar’s website. You can convert multiple files at once by uploading them to the three-step tool, selecting to convert them to CSV, and then downloading the spreadsheet data in the new format.

If you want to convert or edit individual files, you can also open them with Microsoft Excel or LibreOffice, and then use the ‘Save As’ menu option to save them as new CSV files.

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# Converter use https://code.google.com/p/excellibrary/ to read cells. # Place .DLL in same folder as this script. param ( [parameter(Mandatory=$false)] [alias(«source«)] [alias(«src«)] [string]$ExcelFileName, [parameter(Mandatory=$false)] [alias(«destination«)] [alias(«dest«)] [string]$CsvFileName, [parameter(Mandatory=$false)] [alias(«sheet«)] [string]$WorksheetName, [parameter(Mandatory=$false)] [alias(«d«)] [char]$delimiter = ‘;‘, [parameter(Mandatory=$false)] [alias(«h«)] [switch]$help, [parameter(Mandatory=$false)] [switch]$trace ) # Globals $defaultCulture = New-Object System.Globalization.CultureInfo(«da-DK«); $forceQuoteStringChars = («`n`r`»« + $delimiter).ToCharArray(); if($help) { Write-Output «Usage: Convert-Excel-To-Csv -SouRCe file.xls -DESTination file.csv [-sheet SheetName] [-Delimiter Char] [-Help]« Write-Output «-Help: Command usage« Write-Output «-Source: Excel source file« Write-Output «-Destination: Csv destination file« Write-Output «-Sheet: Sheet name. Default is first sheet« Write-Output «-Delimiter: Character used as field delimiter in csv file. Default is semicolon (;)« Exit } if ($ExcelFileName -eq ««) { throw «Please provide path to the Excel file« Exit } if (-not (Test-Path $ExcelFileName)) { throw «Path ‘$ExcelFileName‘ does not exist.« Exit } if ($CsvFileName -eq ««) { throw «Please provide path to the CSV file« Exit } function trace { param($message) if($trace) { Write-Host $message } } function Format-Cell-Date { param($cell,$format,$culture) Try { switch($cell.Value.GetType().FullName) { «System.String« { $cell.StringValue; } «System.Double« { $cell.DateTimeValue.ToString($format,$culture) } default { Write-Error («Unhandled type at cell: $rowIndex,$colIndex : « + $cell.Format.FormatString) exit } } } Catch { $cell.StringValue; } } $customFormats = @{}; function Get-Custom-Format { param([string]$format) $customFormat = $customFormats.Get_Item($format); if($customFormat -eq $null) { if($format -match «^([$-(?<loc>.*)])?(?<fmt>.*);@$«) { $loc = $matches.Get_Item(«loc«); $fmt = $matches.Get_Item(«fmt«); if($loc -eq $null) { $culture = $defaultCulture; } else { $culture = New-Object System.Globalization.CultureInfo([Convert]::ToInt32($loc, 16)); } switch ($fmt) { «dd mmmm yyyy« { $specifier = «D« } «ddmmmmyyyy« { $specifier = «D« } «dd/mm/yyyy« { $specifier = «d« } default { return $null } } $customFormat = @{ culture = $culture; specifier = $specifier }; $customFormats.Add($format, $customFormat); } } return $customFormat; } #load ExcelLibrary DLL $scriptPath = Split-Path $MyInvocation.MyCommand.Path trace «scriptPath: $scriptPath« $assemblyLocation = Join-Path $scriptPath «ExcelLibrary.dll « [Reflection.Assembly]::LoadFrom($assemblyLocation) | Out-Null # open xls file $book = [ExcelLibrary.SpreadSheet.WorkBook]::Load($ExcelFileName); #select sheet if ($WorksheetName) { $sheet = $book.Worksheets | ? {$_.Name -eq $WorkSheetName}; } else { $sheet = $book.Worksheets[0]; } $stream = New-Object System.IO.StreamWriter($CsvFileName,$false,[System.Text.Encoding]::Default) #Mesure cols $cols = 0; for ($rowIndex=$sheet.Cells.FirstRowIndex; $rowIndex -le $sheet.Cells.LastRowIndex; $rowIndex++) { $row = $sheet.Cells.GetRow($rowIndex); if($cols -lt $row.LastColIndex) { $cols = $row.LastColIndex } } $line = New-Object String($delimiter,$cols); for ($rowIndex=0; $rowIndex -lt $sheet.Cells.FirstRowIndex; $rowIndex++) { $stream.WriteLine($line); } $lineStringBuilder = New-Object System.Text.StringBuilder # traverse rows by Index for ($rowIndex=$sheet.Cells.FirstRowIndex; $rowIndex -le $sheet.Cells.LastRowIndex; $rowIndex++) { $row = $sheet.Cells.GetRow($rowIndex); $dummy = $lineStringBuilder.Clear(); for ($colIndex=0; $colIndex -le $cols; $colIndex++) { $value = ««; if($colIndex -ge $row.FirstColIndex -and $colIndex -le $row.LastColIndex) { $cell = $row.GetCell($colIndex); if(-not $cell.IsEmpty) { switch ($cell.Format.FormatType) { «General« {$value = $cell.StringValue;} «Custom« { $customFormat = Get-Custom—Format $cell.Format.FormatString if($customFormat -eq $null) { Write-Error («Unhandled custom format string at cell: $rowIndex,$colIndex : « + $cell.Format.FormatString) exit } $value = Format-Cell—Date $cell $customFormat.specifier $customFormat.culture } «Date« { switch ($cell.Format.FormatString) { «m/d/yy« { $value = Format-Cell—Date $cell «d« $defaultCulture } default { Write-Error («Unhandled date format string at cell: $rowIndex,$colIndex : « + $cell.Format.FormatString) exit } } } default { Write-Error («Unkbown format type at cell: $rowIndex,$colIndex : « + $cell.Format.FormatType) exit } } } } if($value.IndexOfAny($forceQuoteStringChars) -ne -1) { $value = «`»« + $value.Replace(«`»«,«`»`»«) + «`»«; } $dummy = $lineStringBuilder.Append($value); $dummy = $lineStringBuilder.Append($delimiter); } #remove last delimiter $lineStringBuilder.Length—; #write line to csv file $stream.WriteLine($lineStringBuilder); } $stream.Close(); $stream.Dispose();

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