使用NPOI组件完成的Excel导出导入（附源代码，测试通过）

#region ExcelToDataTable(string strExcelFileName, string strSheetName) Excel转换成DataTable--B/S和C/S都可以使用 /// <summary>
/// Excel转换成DataTable
/// </summary>
/// <param name="strExcelFileName">文件路径</param>
/// <param name="strSheetName">Excel中对应的sheet表单名称,如:sheet1,sheet2</param>
/// <returns>数据集</returns>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2100:检查 SQL 查询是否存在安全漏洞")]
public static DataTable ExcelToDataTable(string strExcelFileName, string strSheetName)
{
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + strExcelFileName + ";" +
"Extended Properties=Excel 5.0;";
string strExcel = string.Format("select * from [{0}$]", strSheetName);
DataSet ds = new DataSet();
using (OleDbConnection conn = new OleDbConnection(strConn))
{
conn.Open();
OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, strConn);
adapter.Fill(ds, strSheetName);
conn.Close();
return ds.Tables[strSheetName];
}
} #endregion #region DataTable ExcelToDataTable(string strFileName, int sheetIndex = 0) 根据索引读取Sheet表数据，默认读取第一个sheet--B/S和C/S都可以使用 /// <summary>读取excel
/// 根据索引读取Sheet表数据，默认读取第一个sheet
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <param name="sheetIndex">sheet表的索引，从0开始</param>
/// <returns>数据集</returns>
public static DataTable ExcelToDataTable(string strFileName, int sheetIndex = )
{
DataTable dt = new DataTable();
HSSFWorkbook hssfworkbook = null;
XSSFWorkbook xssfworkbook = null;
string fileExt = Path.GetExtension(strFileName);//获取文件的后缀名
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
if (fileExt == ".xls")
hssfworkbook = new HSSFWorkbook(file);
else if (fileExt == ".xlsx")
xssfworkbook = new XSSFWorkbook(file);//初始化太慢了，不知道这是什么bug
}
if (hssfworkbook != null)
{
HSSFSheet sheet = (HSSFSheet)hssfworkbook.GetSheetAt(sheetIndex);
if (sheet != null)
{
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
HSSFRow headerRow = (HSSFRow)sheet.GetRow();
int cellCount = headerRow.LastCellNum;
for (int j = ; j < cellCount; j++)
{
HSSFCell cell = (HSSFCell)headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (sheet.FirstRowNum + ); i <= sheet.LastRowNum; i++)
{
HSSFRow row = (HSSFRow)sheet.GetRow(i);
DataRow dataRow = dt.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
dt.Rows.Add(dataRow);
}
}
}
else if (xssfworkbook != null)
{
XSSFSheet xSheet = (XSSFSheet)xssfworkbook.GetSheetAt(sheetIndex);
if (xSheet != null)
{
System.Collections.IEnumerator rows = xSheet.GetRowEnumerator();
XSSFRow headerRow = (XSSFRow)xSheet.GetRow();
int cellCount = headerRow.LastCellNum;
for (int j = ; j < cellCount; j++)
{
XSSFCell cell = (XSSFCell)headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (xSheet.FirstRowNum + ); i <= xSheet.LastRowNum; i++)
{
XSSFRow row = (XSSFRow)xSheet.GetRow(i);
DataRow dataRow = dt.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
dt.Rows.Add(dataRow);
}
}
}
return dt;
} #endregion #region DataGridViewToExcel(DataGridView myDgv, string strHeaderText, string strFileName) DataGridView导出到Excel文件--C/S /// <summary>
/// C/S Winform中DataGridView导出数据到Excel
/// </summary>
/// <param name="myDgv">DataGridView控件名称</param>
/// <param name="saveFileName">保存的文件名称，默认没有，调用的时候最好加上，中英文都支持</param>
/// <param name="isOpen">导出后是否打开文件和所在文件夹</param>
/// <param name="saveFilePath">默认保存在“我的文档”中，可自定义保存的文件夹路径</param>
/// <param name="strHeaderText">Excel中第一行的标题文字，默认没有，可以自定义</param>
/// <param name="titleNames">Excel中列名的数组，默认绑定GridView的列名</param>
public static void DataGridViewToExcel(DataGridView myDgv, string saveFileName = null, bool isOpen = false,
string saveFilePath = null, string strHeaderText = null, string[] titleNames = null)
{
using (MemoryStream ms = DataGridViewToExcel(myDgv, strHeaderText, titleNames))
{
if (string.IsNullOrEmpty(saveFileName)) //文件名为空
{
saveFileName = DateTime.Now.Ticks.ToString();
}
if (string.IsNullOrEmpty(saveFilePath) || !System.IO.Directory.Exists(saveFilePath)) //保存路径为空或者不存在
{
saveFilePath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments); //默认在文档文件夹中
}
string saveFullPath = saveFilePath + "\\" + saveFileName + ".xls";
if (System.IO.File.Exists(saveFullPath)) //验证文件重复性
{
saveFullPath = saveFilePath + "\\" + saveFileName +
DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss").Replace(":", "-").Replace(" ", "-") +
".xls";
}
using (FileStream fs = new FileStream(saveFullPath, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, , data.Length);
fs.Flush();
}
if (isOpen)
{
Process.Start(saveFullPath); //打开文件
Process.Start(saveFilePath); //打开文件夹
}
}
} #endregion