How to read an Excel spreadsheet in c# quickly

Question

I am using Microsoft.Office.Interop.Excel to read a spreadsheet that is open in memory.

gXlWs = (Microsoft.Office.Interop.Excel.Worksheet)gXlApp.ActiveWorkbo         


        

Answer 1

Use the OleDB Method. That is the fastest as follows;

string con =
  @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\temp\test.xls;" + 
  @"Extended Properties='Excel 8.0;HDR=Yes;'";    
using(OleDbConnection connection = new OleDbConnection(con))
{
    connection.Open();
    OleDbCommand command = new OleDbCommand("select * from [Sheet1$]", connection); 
    using(OleDbDataReader dr = command.ExecuteReader())
    {
         while(dr.Read())
         {
             var row1Col0 = dr[0];
             Console.WriteLine(row1Col0);
         }
    }
}