NPOI是否支持.xlsx格式？

Question

NPOI DLL会识别.xlsx文件吗？

目前我正在使用NPOI 1.2.5版本的DLL for Microsoft Excel 97-2003,但我也需要访问Excel扩展表.xlsx.

NPOI会支持上述吗？

代码段:

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

您可以使用NPOI读取.xls和.xlsx扩展名中的Excel文件,您只需要在使用部分中添加下一个文件

using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.POIFS.FileSystem;
using NPOI.XSSF.UserModel;
using NPOI.SS.UserModel;

更主要的是在打开文件时,必须让你用此时,相应componente延伸部之间进行区分,并使用ISheet接口,这样可以独立地引用该文件的扩展名的片

//We get the file extension
fileExt = Path.GetExtension(fileName);

//Declare the sheet interface
ISheet sheet;

//Get the Excel file according to the extension
if (fileExt.ToLower() == ".xls")
{
    //Use the NPOI Excel xls object
    HSSFWorkbook hssfwb;
    using (FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read))
    {
        hssfwb = new HSSFWorkbook(file);
    }

    //Assign the sheet
    sheet = hssfwb.GetSheet(sheetName);
}
else //.xlsx extension
{
    //Use the NPOI Excel xlsx object
    XSSFWorkbook hssfwb;
    using (FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read))
    {
        hssfwb = new XSSFWorkbook(file);
    }

    //Assign the sheet
    sheet = hssfwb.GetSheet(sheetName);
}

一旦你有excel对象,你只需要阅读它(在NPOI行和列是零基础)

//Loop through the rows until we find an empty one
for (int row = 0; row <= sheet.LastRowNum; row++)
{
    //Get the cell value
    string cellValue = sheet.GetRow(row).GetCell(0).ToString().Trim(); //In the method GetCell you specify the column number you want to read, in the method GetRow you spacify the row
    string cellValue2 = sheet.GetRow(row).GetCell(0).StringCellValue.Trim();
}

要读取单元格值,可以使用.ToString()方法或StringCellValue属性,但要小心StringCellValue仅适用于字符串单元格,数字和日期单元格会引发异常.

Answer 2

是的,它确实.NPOI 2.0 beta有效.这是一个示例代码,可以帮助您入门:

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("-------------------------------------------");
    }
}
}