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  • 在C#中使用NPOI2.0操作Excel2003和Excel2007

    在C#中使用NPOI2.0操作Excel2003和Excel2007

    Excel2003:

    #region Excel2003
    /// <summary>
    /// 将Excel文件中的数据读出到DataTable中(xls)
    /// </summary>
    /// <param name="file"></param>
    /// <returns></returns>
    public static DataTable ExcelToTableForXLS(string file)
    {
    DataTable dt = new DataTable();
    using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
    {
    XLS.HSSFWorkbook hssfworkbook = new XLS.HSSFWorkbook(fs);
    ISheet sheet = hssfworkbook.GetSheetAt(0);

    //表头
    IRow header = sheet.GetRow(sheet.FirstRowNum);
    List<int> columns = new List<int>();
    for (int i = 0; i < header.LastCellNum; i++)
    {
    object obj = GetValueTypeForXLS(header.GetCell(i) as XLS.HSSFCell);
    if (obj == null || obj.ToString() == string.Empty)
    {
    dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
    //continue;
    }
    else
    dt.Columns.Add(new DataColumn(obj.ToString()));
    columns.Add(i);
    }
    //数据
    for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
    {
    DataRow dr = dt.NewRow();
    bool hasValue = false;
    foreach (int j in columns)
    {
    dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as XLS.HSSFCell);
    if (dr[j] != null && dr[j].ToString() != string.Empty)
    {
    hasValue = true;
    }
    }
    if (hasValue)
    {
    dt.Rows.Add(dr);
    }
    }
    }
    return dt;
    }

    /// <summary>
    /// 将DataTable数据导出到Excel文件中(xls)
    /// </summary>
    /// <param name="dt"></param>
    /// <param name="file"></param>
    public static void TableToExcelForXLS(DataTable dt, string file)
    {
    XLS.HSSFWorkbook hssfworkbook = new XLS.HSSFWorkbook();
    ISheet sheet = hssfworkbook.CreateSheet("Test");

    //表头
    IRow row = sheet.CreateRow(0);
    for (int i = 0; i < dt.Columns.Count; i++)
    {
    ICell cell = row.CreateCell(i);
    cell.SetCellValue(dt.Columns[i].ColumnName);
    }

    //数据
    for (int i = 0; i < dt.Rows.Count; i++)
    {
    IRow row1 = sheet.CreateRow(i + 1);
    for (int j = 0; j < dt.Columns.Count; j++)
    {
    ICell cell = row1.CreateCell(j);
    cell.SetCellValue(dt.Rows[i][j].ToString());
    }
    }

    //转为字节数组
    MemoryStream stream = new MemoryStream();
    hssfworkbook.Write(stream);
    var buf = stream.ToArray();

    //保存为Excel文件
    using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
    {
    fs.Write(buf, 0, buf.Length);
    fs.Flush();
    }
    }

    /// <summary>
    /// 获取单元格类型(xls)
    /// </summary>
    /// <param name="cell"></param>
    /// <returns></returns>
    private static object GetValueTypeForXLS(XLS.HSSFCell cell)
    {
    if (cell == null)
    return null;
    switch (cell.CellType)
    {
    case CellType.BLANK: //BLANK:
    return null;
    case CellType.BOOLEAN: //BOOLEAN:
    return cell.BooleanCellValue;
    case CellType.NUMERIC: //NUMERIC:
    return cell.NumericCellValue;
    case CellType.STRING: //STRING:
    return cell.StringCellValue;
    case CellType.ERROR: //ERROR:
    return cell.ErrorCellValue;
    case CellType.FORMULA: //FORMULA:
    default:
    return "=" + cell.CellFormula;
    }
    }
    #endregion

    Excel2007:

    #region Excel2007
    /// <summary>
    /// 将Excel文件中的数据读出到DataTable中(xlsx)
    /// </summary>
    /// <param name="file"></param>
    /// <returns></returns>
    public static DataTable ExcelToTableForXLSX(string file)
    {
    DataTable dt = new DataTable();
    using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
    {
    XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs);
    ISheet sheet = xssfworkbook.GetSheetAt(0);

    //表头
    IRow header = sheet.GetRow(sheet.FirstRowNum);
    List<int> columns = new List<int>();
    for (int i = 0; i < header.LastCellNum; i++)
    {
    object obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell);
    if (obj == null || obj.ToString() == string.Empty)
    {
    dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
    //continue;
    }
    else
    dt.Columns.Add(new DataColumn(obj.ToString()));
    columns.Add(i);
    }
    //数据
    for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
    {
    DataRow dr = dt.NewRow();
    bool hasValue = false;
    foreach (int j in columns)
    {
    dr[j] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell);
    if (dr[j] != null && dr[j].ToString() != string.Empty)
    {
    hasValue = true;
    }
    }
    if (hasValue)
    {
    dt.Rows.Add(dr);
    }
    }
    }
    return dt;
    }

    /// <summary>
    /// 将DataTable数据导出到Excel文件中(xlsx)
    /// </summary>
    /// <param name="dt"></param>
    /// <param name="file"></param>
    public static void TableToExcelForXLSX(DataTable dt, string file)
    {
    XSSFWorkbook xssfworkbook = new XSSFWorkbook();
    ISheet sheet = xssfworkbook.CreateSheet("Test");

    //表头
    IRow row = sheet.CreateRow(0);
    for (int i = 0; i < dt.Columns.Count; i++)
    {
    ICell cell = row.CreateCell(i);
    cell.SetCellValue(dt.Columns[i].ColumnName);
    }

    //数据
    for (int i = 0; i < dt.Rows.Count; i++)
    {
    IRow row1 = sheet.CreateRow(i + 1);
    for (int j = 0; j < dt.Columns.Count; j++)
    {
    ICell cell = row1.CreateCell(j);
    cell.SetCellValue(dt.Rows[i][j].ToString());
    }
    }

    //转为字节数组
    MemoryStream stream = new MemoryStream();
    xssfworkbook.Write(stream);
    var buf = stream.ToArray();

    //保存为Excel文件
    using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
    {
    fs.Write(buf, 0, buf.Length);
    fs.Flush();
    }
    }

    /// <summary>
    /// 获取单元格类型(xlsx)
    /// </summary>
    /// <param name="cell"></param>
    /// <returns></returns>
    private static object GetValueTypeForXLSX(XSSFCell cell)
    {
    if (cell == null)
    return null;
    switch (cell.CellType)
    {
    case CellType.BLANK: //BLANK:
    return null;
    case CellType.BOOLEAN: //BOOLEAN:
    return cell.BooleanCellValue;
    case CellType.NUMERIC: //NUMERIC:
    return cell.NumericCellValue;
    case CellType.STRING: //STRING:
    return cell.StringCellValue;
    case CellType.ERROR: //ERROR:
    return cell.ErrorCellValue;
    case CellType.FORMULA: //FORMULA:
    default:
    return "=" + cell.CellFormula;
    }
    }

    注意:操作Excel2003与操作Excel2007使用的是不同的命名空间下的内容

    使用NPOI.HSSF.UserModel空间下的HSSFWorkbook操作Excel2003

    使用NPOI.XSSF.UserModel空间下的XSSFWorkbook操作Excel2007

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  • 原文地址:https://www.cnblogs.com/ANDY_ZHANG/p/5427542.html
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