以下是NPOI导入导出EXCEL通用类，是在别人的代码上进行优化的，兼容xls与xlsx文件格式,供参考，可直接使用在WinForm项目中，由于XSSFWorkbook类型的Write方法限制，Write完成后就自动关闭流数据，所以无法很好的支持的Web模式，网上目前也未找到好的解决方案，大家如果有知道的还请告之，谢谢！
注意：若直接使用在WinForm项目中，必需先下载并在项目中引用NPOI2.0或以上版本的组件才可以正常使用，下载地址：http://npoi.codeplex.com/releases/view/125502
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Data;
using System.Windows.Forms;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
namespace TEMS.Service
{
public static class ExcelHelperForCs
{
#region 私有方法
///
/// 获取要保存的文件名称（含完整路径）
///
///
/// 获取要打开要导入的文件名称（含完整路径）
///
///
/// 判断是否为兼容模式
///
///
///
/// 创建工作薄
///
///
///
/// 创建工作薄(依据文件流)
///
///
///
///
/// 创建表格头单元格
///
///
///
/// 从工作表中生成DataTable
///
///
///
///
/// 由DataSet导出Excel
///
/// 要导出数据的DataTable
/// Excel工作表
public static string ExportToExcel(DataSet sourceDs, string filePath = null)
{
if (string.IsNullOrEmpty(filePath))
{
filePath = GetSaveFilePath();
}
if (string.IsNullOrEmpty(filePath)) return null;
bool isCompatible = GetIsCompatible(filePath);
IWorkbook workbook = CreateWorkbook(isCompatible);
ICellStyle cellStyle = GetCellStyle(workbook);
for (int i = 0; i < sourceDs.Tables.Count; i++)
{
DataTable table = sourceDs.Tables[i];
string sheetName = "result" + i.ToString();
ISheet sheet = workbook.CreateSheet(sheetName);
IRow headerRow = sheet.CreateRow(0);
// handling header.
foreach (DataColumn column in table.Columns)
{
ICell cell = headerRow.CreateCell(column.Ordinal);
cell.SetCellValue(column.ColumnName);
cell.CellStyle = cellStyle;
}
// handling value.
int rowIndex = 1;
foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue((row[column] ?? "").ToString());
}
rowIndex++;
}
}
FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
workbook.Write(fs);
fs.Dispose();
workbook = null;
return filePath;
}
///
/// 由DataTable导出Excel
///
/// 要导出数据的DataTable
/// Excel工作表
public static string ExportToExcel(DataTable sourceTable, string sheetName = "result", string filePath = null)
{
if (sourceTable.Rows.Count <= 0) return null;
if (string.IsNullOrEmpty(filePath))
{
filePath = GetSaveFilePath();
}
if (string.IsNullOrEmpty(filePath)) return null;
bool isCompatible = GetIsCompatible(filePath);
IWorkbook workbook = CreateWorkbook(isCompatible);
ICellStyle cellStyle = GetCellStyle(workbook);
ISheet sheet = workbook.CreateSheet(sheetName);
IRow headerRow = sheet.CreateRow(0);
// handling header.
foreach (DataColumn column in sourceTable.Columns)
{
ICell headerCell = headerRow.CreateCell(column.Ordinal);
headerCell.SetCellValue(column.ColumnName);
headerCell.CellStyle = cellStyle;
}
// handling value.
int rowIndex = 1;
foreach (DataRow row in sourceTable.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in sourceTable.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue((row[column]??"").ToString());
}
rowIndex++;
}
FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
workbook.Write(fs);
fs.Dispose();
sheet = null;
headerRow = null;
workbook = null;
return filePath;
}
///
/// 由List导出Excel
///
/// 类型
/// 在导出的List
/// sheet名称
/// (List data, IList> headerNameList, string sheetName = "result", string filePath = null) where T : class
{
if (data.Count <= 0) return null;
if (string.IsNullOrEmpty(filePath))
{
filePath = GetSaveFilePath();
}
if (string.IsNullOrEmpty(filePath)) return null;
bool isCompatible = GetIsCompatible(filePath);
IWorkbook workbook = CreateWorkbook(isCompatible);
ICellStyle cellStyle = GetCellStyle(workbook);
ISheet sheet = workbook.CreateSheet(sheetName);
IRow headerRow = sheet.CreateRow(0);
for (int i = 0; i < headerNameList.Count; i++)
{
ICell cell = headerRow.CreateCell(i);
cell.SetCellValue(headerNameList[i].Value);
cell.CellStyle = cellStyle;
}
Type t = typeof(T);
int rowIndex = 1;
foreach (T item in data)
{
IRow dataRow = sheet.CreateRow(rowIndex);
for (int n = 0; n < headerNameList.Count; n++)
{
object pValue = t.GetProperty(headerNameList[n].Key).GetValue(item, null);
dataRow.CreateCell(n).SetCellValue((pValue ?? "").ToString());
}
rowIndex++;
}
FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
workbook.Write(fs);
fs.Dispose();
sheet = null;
headerRow = null;
workbook = null;
return filePath;
}
///
/// 由DataGridView导出
///
///
///
///
///
/// 由Excel导入DataTable
///
/// Excel文件流
/// Excel工作表名称
/// Excel表头行索引
/// 是否为兼容模式
/// DataTable
public static DataTable ImportFromExcel(Stream excelFileStream, string sheetName, int headerRowIndex, bool isCompatible)
{
IWorkbook workbook = CreateWorkbook(isCompatible, excelFileStream);
ISheet sheet = null;
int sheetIndex = -1;
if (int.TryParse(sheetName, out sheetIndex))
{
sheet = workbook.GetSheetAt(sheetIndex);
}
else
{
sheet = workbook.GetSheet(sheetName);
}
DataTable table = GetDataTableFromSheet(sheet, headerRowIndex);
excelFileStream.Close();
workbook = null;
sheet = null;
return table;
}
///
/// 由Excel导入DataTable
///
/// Excel文件路径，为物理路径。
/// Excel工作表名称
/// Excel表头行索引
/// DataTable
public static DataTable ImportFromExcel(string excelFilePath, string sheetName, int headerRowIndex)
{
if (string.IsNullOrEmpty(excelFilePath))
{
excelFilePath = GetOpenFilePath();
}
if (string.IsNullOrEmpty(excelFilePath))
{
return null;
}
using (FileStream stream = System.IO.File.OpenRead(excelFilePath))
{
bool isCompatible = GetIsCompatible(excelFilePath);
return ImportFromExcel(stream, sheetName, headerRowIndex, isCompatible);
}
}
///
/// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable
///
/// Excel文件流
/// Excel表头行索引
/// 是否为兼容模式
/// DataSet
public static DataSet ImportFromExcel(Stream excelFileStream, int headerRowIndex, bool isCompatible)
{
DataSet ds = new DataSet();
IWorkbook workbook = CreateWorkbook(isCompatible, excelFileStream);
for (int i = 0; i < workbook.NumberOfSheets; i++)
{
ISheet sheet = workbook.GetSheetAt(i);
DataTable table = GetDataTableFromSheet(sheet, headerRowIndex);
ds.Tables.Add(table);
}
excelFileStream.Close();
workbook = null;
return ds;
}
///
/// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable
///
/// Excel文件路径，为物理路径。
/// Excel表头行索引
/// DataSet
public static DataSet ImportFromExcel(string excelFilePath, int headerRowIndex)
{
if (string.IsNullOrEmpty(excelFilePath))
{
excelFilePath = GetOpenFilePath();
}
if (string.IsNullOrEmpty(excelFilePath))
{
return null;
}
using (FileStream stream = System.IO.File.OpenRead(excelFilePath))
{
bool isCompatible = GetIsCompatible(excelFilePath);
return ImportFromExcel(stream, headerRowIndex, isCompatible);
}
}
#endregion
#region 公共转换方法
///
/// 将Excel的列索引转换为列名，列索引从0开始，列名从A开始。如第0列为A，第1列为B...
///
/// 列索引
/// 列名，如第0列为A，第1列为B...
public static string ConvertColumnIndexToColumnName(int index)
{
index = index + 1;
int system = 26;
char[] digArray = new char[100];
int i = 0;
while (index > 0)
{
int mod = index % system;
if (mod == 0) mod = system;
digArray[i++] = (char)(mod - 1 + 'A');
index = (index - 1) / 26;
}
StringBuilder sb = new StringBuilder(i);
for (int j = i - 1; j >= 0; j--)
{
sb.Append(digArray[j]);
}
return sb.ToString();
}
///
/// 转化日期
///
/// 日期
///
/// 转化数字
///
/// 数字字符串
///
/// 转化布尔
///
///
///
说明：以上代码自第一次发文后经过了数次更新，现在您看到的是比较完善的，可直接应用于C/S项目中.