Question

I’m having some troubles while reading from an exel in c#.
I have this code which i read every cell from A to X.

            int i = 1;
            int number;
            System.Array myvalues; string[] strArray;
            Microsoft.Office.Interop.Excel.Range range = worksheet.get_Range("A" + i.ToString(), "X" + i.ToString());
            while(range.Count!=0)
            {
                    i++;
                    range = worksheet.get_Range("A" + i.ToString(), "X" + i.ToString());
                    myvalues = (System.Array)range.Cells.Value;
                    strArray = ConvertToStringArray(myvalues);
                    number = Convert.ToInt32(strArray[0]);
            }

My question is: How could i read next 4 * “number” rows in excel based on “number” value ?

For example:

         A B C D E F G H I J
         a a a a a 1 a a a a 

F’s cell value is 1 so i would like to read ( G H I J)
If F’s cell value is 2 the i would like to read ( G H I J K L M N)

         A B C D E F G H I J K L M N
         a a a a a 2 a a a a a a a a

F’s cell value 3 :

        A B C D E F G H I J K L M N O P Q R
        a a a a a 3 a a a a a a a a a a a a

Answer 1

code:

int i = 1;
do
{

   i++;
   var range = worksheet.get_Range("A" + i.ToString(), "X" + i.ToString());
   if (range.Count != 0) 
   {
      var myvalues = (System.Array)range.Cells.Value;
      var strArray = ConvertToStringArray(myvalues);
      var number = Convert.ToInt32(strArray[0]);
      MyMethodReadRage(worksheet, number);
   }

} while(range.Count!=0);

method for read range:

void MyMethodReadRage(Microsoft.Office.Interop.Excel.Worksheet worksheet, int numberRows)
{
   var range = worksheet.get_Range("A" + numberRows, "X" + (numberRows + 4));
   /*code*/
}

EDIT

Reads the value of the column “F”, multiplicas the value by 4 and add the amount of previous columns (up to “F”). You then use this (this unproven) function to get the letter.

    /// <summary>
    /// http://www.freevbcode.com/ShowCode.asp?ID=4303
    /// </summary>
    private string ColumnLetter(int ColumnNumber)
    {
        if (ColumnNumber > 26)
        {
            return string.Format("{0}{1}", (char)(Convert.ToInt32((ColumnNumber - 1) / 26) + 64), (char)(((ColumnNumber - 1) % 26) + 65));
        }
        else
        {
            return string.Format("{0}", (char)(ColumnNumber + 64));
        }
    }

EDIT II

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplicationExcelCeldas
{
    class Program
    { 
        private const int NumberPositionColumnF = 6;

        static void Main(string[] args)
        {
            Microsoft.Office.Interop.Excel.Worksheet worksheet = new Microsoft.Office.Interop.Excel.Worksheet();

            var i = 0;
            var test = new TestExcel();
            do
            {
                i++;
                var rangeF = worksheet.get_Range(string.Format("F{0}" , i));
                if (rangeF.Count == 0)
                {
                    break;
                }

                var values = test.GetCellsStringArray(rangeF);
                if (values.Count() > 0) 
                {
                    int number = 0;
                    if (int.TryParse(values[0], out number))
                    {
                        var rangeAll = worksheet.get_Range(
                            string.Format("A{0}" , i), 
                            string.Format("{0}{1}", test.ColumnLetter(Program.NumberPositionColumnF + (number * 4)), i));


                        /*
                         your code for work with rangeAll
                        */
                    }
                }

            } while (true);
        }
    }

    class TestExcel
    {
        internal string[] GetCellsStringArray(Microsoft.Office.Interop.Excel.Range range)
        {
            var myvalues = (System.Array)range.Cells.Value;
            return this.ConvertToStringArray(myvalues);
        }

        internal string[] ConvertToStringArray(System.Array values)
        {
            string[] theArray = new string[values.Length];
            for (int i = 1; i <= values.Length; i++)
            {
                if (values.GetValue(1, i) == null)
                    theArray[i - 1] = "";
                else
                    theArray[i - 1] = (string)values.GetValue(1, i).ToString();
            }
            return theArray;
        }

        internal string ColumnLetter(int columnNumber)
        {
            if (columnNumber > 26)
            {
                return string.Format("{0}{1}", (char)(Convert.ToInt32((columnNumber - 1) / 26) + 64), (char)(((columnNumber - 1) % 26) + 65));
            }
            else
            {
                return string.Format("{0}", (char)(columnNumber + 64));
            }
        }
    }
}