这里使用的NPOI版本为: 2.1.3.1

版本内包含.Net 2.0 与.Net 4.0

.Net 4.0中包含文件

使用时需引用需要引用所有5个dll

使用到的引用

using NPOI.HSSF.UserModel;

using NPOI.SS.UserModel;

using NPOI.XSSF.UserModel;

还有经过自己整理的导入导出Excel代码：

///

/// Excel导入成Datable

///

/// 导入路径(包含文件名与扩展名)

///

public static DataTable ExcelToTable(string file)

{

DataTable dt = new DataTable();

IWorkbook workbook;

string fileExt = Path.GetExtension(file).ToLower();

using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))

{

//XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式

if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(fs); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(fs); } else { workbook = null; }

if (workbook == null) { return null; }

ISheet sheet = workbook.GetSheetAt(0);

//表头

IRow header = sheet.GetRow(sheet.FirstRowNum);

List columns = new List();

for (int i = 0; i < header.LastCellNum; i++)

{

object obj = GetValueType(header.GetCell(i));

if (obj == null || obj.ToString() == string.Empty)

{

dt.Columns.Add(new DataColumn("Columns" + i.ToString()));

}

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] = GetValueType(sheet.GetRow(i).GetCell(j));

if (dr[j] != null && dr[j].ToString() != string.Empty)

{

hasValue = true;

}

}

if (hasValue)

{

dt.Rows.Add(dr);

}

}

}

return dt;

}

///

/// Datable导出成Excel

///

///

/// 导出路径(包括文件名与扩展名)

public static void TableToExcel(DataTable dt, string file)

{

IWorkbook workbook;

string fileExt = Path.GetExtension(file).ToLower();

if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(); } else { workbook = null; }

if (workbook == null) { return; }

ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(dt.TableName);

//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();

workbook.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();

}

}

///

/// 获取单元格类型

///

///

///

private static object GetValueType(ICell 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;

}

}

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