在C#中使用NPOI2.0操作Excel2003和Excel2007

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在C#中使用NPOI2.0操作Excel2003和Excel2007

Excel2003：

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#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：

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#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