Does NPOI have support to .xlsx format?

Question

Will NPOI DLL recognize .xlsx file?

Currently I'm using NPOI 1.2.5 version DLL for Microsoft Excel 97-2003, but I need to access Excel sheets of extension .xlsx also.

Will NPOI support the above?

Code snippet:

static void Main(string[] args) {
    XSSFWorkbook xssfwb;

    using(FileStream file=new FileStream(
            @"C:\Users\347702\Desktop\Hello.xlsx",
            FileMode.Open, FileAccess.Read)) {
        xssfwb=new XSSFWorkbook(file);
    }

    ISheet sheet=xssfwb.GetSheet("sheet1");
    sheet.GetRow(1048576);
    Console.WriteLine(sheet.GetRow(1048576).GetCell(0).StringCellValue);
}

Answer 1

Yes it does. NPOI 2.0 beta works. Here's a sample code to get you started:

class Program
{
static XSSFWorkbook hssfworkbook;
static DataSet dataSet1 = new DataSet();

static void Main(string[] args)
{
    InitializeWorkbook(@"E:\Docs\HoursWidget_RTM.xlsx");
    xlsxToDT();

    DisplayData(dataSet1.Tables[0]);

    Console.ReadLine();
}

static void InitializeWorkbook(string path)
{
    using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
    {
        hssfworkbook = new XSSFWorkbook(file);
    }
}

static void xlsxToDT()
{
    DataTable dt = new DataTable();
    ISheet sheet = hssfworkbook.GetSheetAt(1);
    IRow headerRow = sheet.GetRow(0);
    IEnumerator rows = sheet.GetRowEnumerator();

    int colCount = headerRow.LastCellNum;
    int rowCount = sheet.LastRowNum;

    for (int c = 0; c < colCount; c++)
    {

        dt.Columns.Add(headerRow.GetCell(c).ToString());
    }

    bool skipReadingHeaderRow = rows.MoveNext();
    while (rows.MoveNext())
    {
        IRow row = (XSSFRow)rows.Current;
        DataRow dr = dt.NewRow();

        for (int i = 0; i < colCount; i++)
        {
            ICell cell = row.GetCell(i);

            if (cell != null)
            {
                dr[i] = cell.ToString();
            }
        }
        dt.Rows.Add(dr);
    }

    hssfworkbook = null;
    sheet = null;
    dataSet1.Tables.Add(dt);
}

static void DisplayData(DataTable table)
{
    foreach (DataRow row in table.Rows)
    {
        foreach (DataColumn col in table.Columns)
        {
            Console.WriteLine("{0} = {1}", col.ColumnName, row[col]);
        }
        Console.WriteLine("-------------------------------------------");
    }
}
}