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 /// <summary>
/// 获取要保存的文件名称（含完整路径）
/// </summary>
/// <returns></returns>
private static string GetSaveFilePath()
{
SaveFileDialog saveFileDig = new SaveFileDialog();
saveFileDig.Filter = "Excel Office97-2003(*.xls)|*.xls|Excel Office2007及以上(*.xlsx)|*.xlsx";
saveFileDig.FilterIndex = 0;
saveFileDig.Title = "导出到";
saveFileDig.OverwritePrompt = true;
saveFileDig.InitialDirectory = Common.DesktopDirectory;
string filePath = null;
if (saveFileDig.ShowDialog() == DialogResult.OK)
{
filePath = saveFileDig.FileName;
} return filePath;
} /// <summary>
/// 获取要打开要导入的文件名称（含完整路径）
/// </summary>
/// <returns></returns>
private static string GetOpenFilePath()
{
OpenFileDialog openFileDig = new OpenFileDialog();
openFileDig.Filter = "Excel Office97-2003(*.xls)|*.xls|Excel Office2007及以上(*.xlsx)|*.xlsx";
openFileDig.FilterIndex = 0;
openFileDig.Title = "打开";
openFileDig.CheckFileExists = true;
openFileDig.CheckPathExists = true;
openFileDig.InitialDirectory = Common.DesktopDirectory;
string filePath = null;
if (openFileDig.ShowDialog() == DialogResult.OK)
{
filePath = openFileDig.FileName;
} return filePath;
} /// <summary>
/// 判断是否为兼容模式
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
private static bool GetIsCompatible(string filePath)
{
return filePath.EndsWith(".xls", StringComparison.OrdinalIgnoreCase);
} /// <summary>
/// 创建工作薄
/// </summary>
/// <param name="isCompatible"></param>
/// <returns></returns>
private static IWorkbook CreateWorkbook(bool isCompatible)
{
if (isCompatible)
{
return new HSSFWorkbook();
}
else
{
return new XSSFWorkbook();
}
} /// <summary>
/// 创建工作薄(依据文件流)
/// </summary>
/// <param name="isCompatible"></param>
/// <param name="stream"></param>
/// <returns></returns>
private static IWorkbook CreateWorkbook(bool isCompatible, dynamic stream)
{
if (isCompatible)
{
return new HSSFWorkbook(stream);
}
else
{
return new XSSFWorkbook(stream);
}
} /// <summary>
/// 创建表格头单元格
/// </summary>
/// <param name="sheet"></param>
/// <returns></returns>
private static ICellStyle GetCellStyle(IWorkbook workbook)
{
ICellStyle style = workbook.CreateCellStyle();
style.FillPattern = FillPattern.SolidForeground;
style.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Grey25Percent.Index; return style;
} /// <summary>
/// 从工作表中生成DataTable
/// </summary>
/// <param name="sheet"></param>
/// <param name="headerRowIndex"></param>
/// <returns></returns>
private static DataTable GetDataTableFromSheet(ISheet sheet, int headerRowIndex)
{
DataTable table = new DataTable(); IRow headerRow = sheet.GetRow(headerRowIndex);
int cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
if (headerRow.GetCell(i) == null || headerRow.GetCell(i).StringCellValue.Trim() == "")
{
// 如果遇到第一个空列，则不再继续向后读取
cellCount = i;
break;
}
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
} for (int i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
//如果遇到某行的第一个单元格的值为空，则不再继续向下读取
if (row != null && !string.IsNullOrEmpty(row.GetCell(0).ToString()))
{
DataRow dataRow = table.NewRow(); for (int j = row.FirstCellNum; j < cellCount; j++)
{
dataRow[j] = row.GetCell(j).ToString();
} table.Rows.Add(dataRow);
}
} return table;
} #endregion #region 公共导出方法 /// <summary>
/// 由DataSet导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的DataTable</param>
/// <returns>Excel工作表</returns>
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; } /// <summary>
/// 由DataTable导出Excel
/// </summary>
/// <param name="sourceTable">要导出数据的DataTable</param>
/// <returns>Excel工作表</returns>
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;
} /// <summary>
/// 由List导出Excel
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="data">在导出的List</param>
/// <param name="sheetName">sheet名称</param>
/// <returns></returns>
public static string ExportToExcel<T>(List<T> data, IList<KeyValuePair<string, string>> 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;
} /// <summary>
/// 由DataGridView导出
/// </summary>
/// <param name="grid"></param>
/// <param name="sheetName"></param>
/// <param name="filePath"></param>
/// <returns></returns>
public static string ExportToExcel(DataGridView grid, string sheetName = "result", string filePath = null)
{
if (grid.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); for (int i = 0; i < grid.Columns.Count; i++)
{
ICell cell = headerRow.CreateCell(i);
cell.SetCellValue(grid.Columns[i].HeaderText);
cell.CellStyle = cellStyle;
} int rowIndex = 1;
foreach (DataGridViewRow row in grid.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
for (int n = 0; n < grid.Columns.Count; n++)
{
dataRow.CreateCell(n).SetCellValue((row.Cells[n].Value ?? "").ToString());
}
rowIndex++;
} FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
workbook.Write(fs);
fs.Dispose(); sheet = null;
headerRow = null;
workbook = null; return filePath;
} #endregion #region 公共导入方法 /// <summary>
/// 由Excel导入DataTable
/// </summary>
/// <param name="excelFileStream">Excel文件流</param>
/// <param name="sheetName">Excel工作表名称</param>
/// <param name="headerRowIndex">Excel表头行索引</param>
/// <param name="isCompatible">是否为兼容模式</param>
/// <returns>DataTable</returns>
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;
} /// <summary>
/// 由Excel导入DataTable
/// </summary>
/// <param name="excelFilePath">Excel文件路径，为物理路径。</param>
/// <param name="sheetName">Excel工作表名称</param>
/// <param name="headerRowIndex">Excel表头行索引</param>
/// <returns>DataTable</returns>
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);
}
} /// <summary>
/// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable
/// </summary>
/// <param name="excelFileStream">Excel文件流</param>
/// <param name="headerRowIndex">Excel表头行索引</param>
/// <param name="isCompatible">是否为兼容模式</param>
/// <returns>DataSet</returns>
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;
} /// <summary>
/// 由Excel导入DataSet，如果有多个工作表，则导入多个DataTable
/// </summary>
/// <param name="excelFilePath">Excel文件路径，为物理路径。</param>
/// <param name="headerRowIndex">Excel表头行索引</param>
/// <returns>DataSet</returns>
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 /// <summary>
/// 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...
/// </summary>
/// <param name="index">列索引</param>
/// <returns>列名，如第0列为A，第1列为B...</returns>
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();
} /// <summary>
/// 转化日期
/// </summary>
/// <param name="date">日期</param>
/// <returns></returns>
public static DateTime ConvertToDate(object date)
{
string dtStr = (date ?? "").ToString(); DateTime dt = new DateTime(); if (DateTime.TryParse(dtStr, out dt))
{
return dt;
} try
{
string spStr = "";
if (dtStr.Contains("-"))
{
spStr = "-";
}
else if (dtStr.Contains("/"))
{
spStr = "/";
}
string[] time = dtStr.Split(spStr.ToCharArray());
int year = Convert.ToInt32(time[2]);
int month = Convert.ToInt32(time[0]);
int day = Convert.ToInt32(time[1]);
string years = Convert.ToString(year);
string months = Convert.ToString(month);
string days = Convert.ToString(day);
if (months.Length == 4)
{
dt = Convert.ToDateTime(date);
}
else
{
string rq = "";
if (years.Length == 1)
{
years = "0" + years;
}
if (months.Length == 1)
{
months = "0" + months;
}
if (days.Length == 1)
{
days = "0" + days;
}
rq = "20" + years + "-" + months + "-" + days;
dt = Convert.ToDateTime(rq);
}
}
catch
{
throw new Exception("日期格式不正确，转换日期类型失败！");
}
return dt;
} /// <summary>
/// 转化数字
/// </summary>
/// <param name="d">数字字符串</param>
/// <returns></returns>
public static decimal ConvertToDecimal(object d)
{
string dStr = (d ?? "").ToString();
decimal result = 0;
if (decimal.TryParse(dStr, out result))
{
return result;
}
else
{
throw new Exception("数字格式不正确，转换数字类型失败！");
} } /// <summary>
/// 转化布尔
/// </summary>
/// <param name="b"></param>
/// <returns></returns>
public static bool ConvertToBoolen(object b)
{
string bStr = (b ?? "").ToString().Trim();
bool result = false;
if (bool.TryParse(bStr, out result))
{
return result;
}
else if (bStr=="0" || bStr=="1")
{
return (bStr == "0");
}
else
{
throw new Exception("布尔格式不正确，转换布尔类型失败！");
}
} #endregion
}
}
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.