You can create your customs methods to iterate through a range and read the cell values. I would do it the following way:
static void Main(string[] args)
{
int rowStart = 4;
string colStart = "Q";
int rowEnd = 89;
string colEnd = "AD";
string currentRow = colStart;
// make sure rowStart < rowEnd && colStart < colEnd
using (document = SpreadsheetDocument.Open(filePath, true))
{
WorkbookPart wbPart = document.WorkbookPart;
Worksheet sheet = wbPart.WorksheetParts.First().Worksheet;
while(currentRow != GetNextColumn(colEnd))
{
for (int i = rowStart; i <= rowEnd; i++)
{
Cell cell = GetCell(sheet, currentRow, i);
}
currentRow = GetNextColumn(currentRow);
}
}
Console.Read();
}
Method that gets you the cell value:
private static Cell GetCell(Worksheet worksheet,
string columnName, uint rowIndex)
{
Row row = GetRow(worksheet, rowIndex);
if (row == null)
return null;
return row.Elements<Cell>().Where(c => string.Compare
(c.CellReference.Value, columnName +
rowIndex, true) == 0).First();
}
Method to get the row:
// Given a worksheet and a row index, return the row.
private static Row GetRow(Worksheet worksheet, uint rowIndex)
{
return worksheet.GetFirstChild<SheetData>().
Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
}
Method to get the next column:
static string GetNextColumn(string col)
{
char[] charArr = col.ToCharArray();
var cur = Convert.ToChar((int) charArr[charArr.Length - 1]);
if (cur == 'Z')
{
if (charArr.Length == 1)
{
return "AA";
}
else
{
char[] newArray = charArr.Take(charArr.Length - 1).ToArray();
var ret = GetNextColumn(new string(newArray));
return ret + "A";
}
}
charArr[charArr.Length - 1] = Convert.ToChar((int)charArr[charArr.Length - 1] + 1);
return new string(charArr);
}