Save an excel file to a csv file in C# code

Question

I want to open an excel file and save it as a csv file. Google search no lucky. I need C sharp code to do it.

Thanks for your nice help.

Answer 1

You could use Visual Studio Tools for Office or ADO.NET to do this.
For more compatibility I suggest you to use the second one: take a look at some tutorials like David Hayden's one to learn how to use it.

To create a CSV file you have just to read the Excel data and write the results to a file using the structure written in Wikipedia.

Answer 2

If you are willing to use Excel Interop:

        Excel.Application app = new Excel.Application();
        Excel.Workbook wb = app.Workbooks.Open(@"c:\temp\testtable.xlsx");
        wb.SaveAs(@"C:\Temp\output.csv", Excel.XlFileFormat.xlCSVWindows);
        wb.Close(false);
        app.Quit();
        Console.WriteLine("Done!");

Answer 3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Excel;
using System.IO;

namespace TestConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            String fromFile = @"C:\ExlTest\Test.xlsx";
            String toFile = @"C:\ExlTest\csv\Test.csv";

            Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel.Workbook wb = app.Workbooks.Open(fromFile, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

            // this does not throw exception if file doesnt exist
            File.Delete(toFile);

            wb.SaveAs(toFile, Microsoft.Office.Interop.Excel.XlFileFormat.xlCSVWindows, Type.Missing, Type.Missing, false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Microsoft.Office.Interop.Excel.XlSaveConflictResolution.xlLocalSessionChanges, false, Type.Missing, Type.Missing, Type.Missing);

            wb.Close(false,Type.Missing,Type.Missing);

            app.Quit();
        }
    }
}