NPOI 2.1.1 系列(1) 使用NPOI读取 Excel文档 ;NpoiExcelHelper 导入导出 2003格式 2007格式的 Excel; Npoi 导出 xlsx 格式

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NpoiExcelHelper 可以生成xlsx格式public class ExcelNpoiHelper
{
//private static WriteLog wl = new WriteLog();

#region 从datatable中将数据导出到excel
/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
static MemoryStream ExportDt(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet() as HSSFSheet;

#region 右击文件 属性信息

//{
// DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
// dsi.Company = "NPOI";
// workbook.DocumentSummaryInformation = dsi;

// SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
// si.Author = "文件作者信息"; //填加xls文件作者信息
// si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
// si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
// si.Comments = "作者信息"; //填加xls文件作者信息
// si.Title = "标题信息"; //填加xls文件标题信息
// si.Subject = "主题信息"; //填加文件主题信息
// si.CreateDateTime = DateTime.Now;
// workbook.SummaryInformation = si;
//}

#endregion

HSSFCellStyle dateStyle = workbook.CreateCellStyle() as HSSFCellStyle;
HSSFDataFormat format = workbook.CreateDataFormat() as HSSFDataFormat;
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

//取得列宽
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = 0;

foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式

if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet() as HSSFSheet;
}

#region 表头及样式

{
HSSFRow headerRow = sheet.CreateRow(0) as HSSFRow;
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);

HSSFCellStyle headStyle = workbook.CreateCellStyle() as HSSFCellStyle;
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
HSSFFont font = workbook.CreateFont() as HSSFFont;
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);

headerRow.GetCell(0).CellStyle = headStyle;

sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}

#endregion

#region 列头及样式

{
HSSFRow headerRow = sheet.CreateRow(1) as HSSFRow;

HSSFCellStyle headStyle = workbook.CreateCellStyle() as HSSFCellStyle;
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
HSSFFont font = workbook.CreateFont() as HSSFFont;
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);

foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);

}
//headerRow.Dispose();
}

#endregion

rowIndex = 2;
}

#endregion

#region 填充内容

HSSFRow dataRow = sheet.CreateRow(rowIndex) as HSSFRow;
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = dataRow.CreateCell(column.Ordinal) as HSSFCell;

string drValue = row[column].ToString();

switch (column.DataType.ToString())
{
case "System.String": //字符串类型
double result;
if (IsNumeric(drValue, out result))
{

double.TryParse(drValue, out result);
newCell.SetCellValue(result);
break;
}
else
{
newCell.SetCellValue(drValue);
break;
}

case "System.DateTime": //日期类型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);

newCell.CellStyle = dateStyle; //格式化显示
break;
case "System.Boolean": //布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16": //整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal": //浮点型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull": //空值处理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}

}

#endregion

rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;

//sheet;
//workbook.Dispose();

return ms;
}
}

/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
public static void ExportDTtoExcel(DataTable dtSource, string strHeaderText, string strFileName)
{
using (MemoryStream ms = ExportDt(dtSource, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
#endregion

#region 从excel2003/2007中将数据导出到datatable(默认第一行为标头,实际数据从第二行读取)
/// <summary>读取excel
/// 默认第一行为标头,实际数据从第二行读取
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable ImportExcel2003ToDt(string strFileName)
{
DataTable dt = new DataTable();
IWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = hssfworkbook.GetSheetAt(0) as HSSFSheet;
dt = ImportExcel2003InDt(sheet, 0, true);
return dt;
}

/// <summary>读取excel
/// 默认第一行为标头,实际数据从第二行读取
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable ImportExcel2007ToDt(string strFileName)
{
DataTable dt = new DataTable();
IWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new XSSFWorkbook(file);
}
ISheet sheet = hssfworkbook.GetSheetAt(0);
dt = ImportExcel2007InDt(sheet, 0, true);
return dt;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheetName">需要导出的sheet</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExcel2003ToDt(string strFileName, string sheetName, int headerRowIndex)
{
IWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheet(sheetName) as HSSFSheet;
DataTable table = new DataTable();
table = ImportExcel2003InDt(sheet, headerRowIndex, true);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheetName">需要导出的sheet</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExcel2007ToDt(string strFileName, string sheetName, int headerRowIndex)
{
IWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new XSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheet(sheetName) as HSSFSheet;
DataTable table = new DataTable();
table = ImportExcel2007InDt(sheet, headerRowIndex, true);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheetIndex">需要导出的sheet序号</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExcel2003ToDt(string strFileName, int sheetIndex, int headerRowIndex)
{
HSSFWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheetAt(sheetIndex) as HSSFSheet;
DataTable table = new DataTable();
table = ImportExcel2003InDt(sheet, headerRowIndex, true);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}
/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheetIndex">需要导出的sheet序号</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <returns></returns>
public static DataTable ImportExcel2007ToDt(string strFileName, int sheetIndex, int headerRowIndex)
{
IWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new XSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheetAt(sheetIndex) as HSSFSheet;
DataTable table = new DataTable();
table = ImportExcel2007InDt(sheet, headerRowIndex, true);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheetName">需要导出的sheet</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <param name="needHeader">是否需要头</param>
/// <returns></returns>
public static DataTable ImportExcel2003ToDt(string strFileName, string sheetName, int headerRowIndex, bool needHeader)
{
IWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheet(sheetName) as HSSFSheet;
DataTable table = new DataTable();
table = ImportExcel2003InDt(sheet, headerRowIndex, needHeader);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

/// <summary>
/// 读取excel
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheetIndex">需要导出的sheet序号</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <param name="needHeader">是否需要头</param>
/// <returns></returns>
public static DataTable ImportExcel2003ToDt(string strFileName, int sheetIndex, int headerRowIndex, bool needHeader)
{
HSSFWorkbook workbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
workbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = workbook.GetSheetAt(sheetIndex) as HSSFSheet;
DataTable table = new DataTable();
table = ImportExcel2003InDt(sheet, headerRowIndex, needHeader);
//ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}

static DataTable ImportExcel2003InDt(ISheet sheet, int headerRowIndex, bool needHeader)
{
DataTable table = new DataTable();
HSSFRow headerRow;
int cellCount;
try
{
if (headerRowIndex < 0 || !needHeader)
{
headerRow = sheet.GetRow(0) as HSSFRow;
cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else
{
headerRow = sheet.GetRow(headerRowIndex) as HSSFRow;
cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
if (headerRow.GetCell(i) == null)
{
if (table.Columns.IndexOf(Convert.ToString(i)) > 0)
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}

}
else if (table.Columns.IndexOf(headerRow.GetCell(i).ToString()) > 0)
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
DataColumn column = new DataColumn(headerRow.GetCell(i).ToString());
table.Columns.Add(column);
}
}
}
int rowCount = sheet.LastRowNum;
for (int i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++)
{
try
{
HSSFRow row;
if (sheet.GetRow(i) == null)
{
row = sheet.CreateRow(i) as HSSFRow;
}
else
{
row = sheet.GetRow(i) as HSSFRow;
}

DataRow dataRow = table.NewRow();

for (int j = row.FirstCellNum; j <= cellCount; j++)
{
try
{
if (row.GetCell(j) != null)
{
switch (row.GetCell(j).CellType)
{
case CellType.String:
string str = row.GetCell(j).StringCellValue;
if (str != null && str.Length > 0)
{
dataRow[j] = str.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.Numeric:
if (DateUtil.IsCellDateFormatted(row.GetCell(j)))
{
dataRow[j] = DateTime.FromOADate(row.GetCell(j).NumericCellValue);
}
else
{
dataRow[j] = Convert.ToDouble(row.GetCell(j).NumericCellValue);
}
break;
case CellType.Boolean:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.Error:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
case CellType.Formula:
switch (row.GetCell(j).CachedFormulaResultType)
{
case CellType.String:
string strFORMULA = row.GetCell(j).StringCellValue;
if (strFORMULA != null && strFORMULA.Length > 0)
{
dataRow[j] = strFORMULA.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.Numeric:
dataRow[j] = Convert.ToString(row.GetCell(j).NumericCellValue);
break;
case CellType.Boolean:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.Error:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
default:
dataRow[j] = "";
break;
}
break;
default:
dataRow[j] = "";
break;
}
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
}
table.Rows.Add(dataRow);
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return table;
}

/// <summary>
/// 将制定sheet中的数据导出到datatable中
/// </summary>
/// <param name="sheet">需要导出的sheet</param>
/// <param name="headerRowIndex">列头所在行号，-1表示没有列头</param>
/// <param name="needHeader">是否需要列头</param>
/// <returns></returns>
static DataTable ImportExcel2007InDt(ISheet sheet, int headerRowIndex, bool needHeader)
{
DataTable table = new DataTable();
NPOI.XSSF.UserModel.XSSFRow headerRow;
int cellCount;
try
{
if (headerRowIndex < 0 || !needHeader)
{
headerRow = sheet.GetRow(0) as NPOI.XSSF.UserModel.XSSFRow;
cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else
{
headerRow = sheet.GetRow(headerRowIndex) as NPOI.XSSF.UserModel.XSSFRow;
cellCount = headerRow.LastCellNum;

for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
if (headerRow.GetCell(i) == null)
{
if (table.Columns.IndexOf(Convert.ToString(i)) > 0)
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}

}
else if (table.Columns.IndexOf(headerRow.GetCell(i).ToString()) > 0)
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
DataColumn column = new DataColumn(headerRow.GetCell(i).ToString());
table.Columns.Add(column);
}
}
}
int rowCount = sheet.LastRowNum;
for (int i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++)
{
try
{
NPOI.XSSF.UserModel.XSSFRow row;
if (sheet.GetRow(i) == null)
{
row = sheet.CreateRow(i) as NPOI.XSSF.UserModel.XSSFRow;
}
else
{
row = sheet.GetRow(i) as NPOI.XSSF.UserModel.XSSFRow;
}

DataRow dataRow = table.NewRow();

for (int j = row.FirstCellNum; j <= cellCount; j++)
{
try
{
if (row.GetCell(j) != null)
{
switch (row.GetCell(j).CellType)
{
case CellType.String:
string str = row.GetCell(j).StringCellValue;
if (str != null && str.Length > 0)
{
dataRow[j] = str.ToString();
}
else
{
dataRow[j] = null;
}
break;
case CellType.Numeric:
if (DateUtil.IsCellDateFormatted(row.GetCell(j)))
{
dataRow[j] = DateTime.FromOADate(row.GetCell(j).NumericCellValue);
}
else
{
dataRow[j] = Convert.ToDouble(row.GetCell(j).NumericCellValue);
}
break;
case CellType.Boolean:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.Error:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
case CellType.Formula:
switch (row.GetCell(j).CachedFormulaResultType)
{
case CellType.String:
string strFormula = row.GetCell(j).StringCellValue;
if (!string.IsNullOrEmpty(strFormula))
{
dataRow[j] = strFormula;
}
else
{
dataRow[j] = null;
}
break;
case CellType.Numeric:
dataRow[j] = Convert.ToString(row.GetCell(j).NumericCellValue);
break;
case CellType.Boolean:
dataRow[j] = Convert.ToString(row.GetCell(j).BooleanCellValue);
break;
case CellType.Error:
dataRow[j] = ErrorEval.GetText(row.GetCell(j).ErrorCellValue);
break;
default:
dataRow[j] = "";
break;
}
break;
default:
dataRow[j] = "";
break;
}
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
}
table.Rows.Add(dataRow);
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return table;
}
#endregion

#region 更新excel中的数据
/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluid">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, string[] updateData, int coluid, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int i = 0; i < updateData.Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluid) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluid);
}

sheet1.GetRow(i + rowid).GetCell(coluid).SetCellValue(updateData[i]);
}
catch (Exception ex)
{
// wl.WriteLogs(ex.ToString());
throw;
}
}
try
{
readfile.Close();
FileStream writefile = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
// wl.WriteLogs(ex.ToString());
}

}

/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluids">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, string[][] updateData, int[] coluids, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
readfile.Close();
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int j = 0; j < coluids.Length; j++)
{
for (int i = 0; i < updateData[j].Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluids[j]) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluids[j]);
}
sheet1.GetRow(i + rowid).GetCell(coluids[j]).SetCellValue(updateData[j][i]);
}
catch (Exception ex)
{
// wl.WriteLogs(ex.ToString());
}
}
}
try
{
FileStream writefile = new FileStream(outputFile, FileMode.Create);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}
}

/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluid">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, double[] updateData, int coluid, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int i = 0; i < updateData.Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluid) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluid);
}

sheet1.GetRow(i + rowid).GetCell(coluid).SetCellValue(updateData[i]);
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
throw;
}
}
try
{
readfile.Close();
FileStream writefile = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}

}

/// <summary>
/// 更新Excel表格
/// </summary>
/// <param name="outputFile">需更新的excel表格路径</param>
/// <param name="sheetname">sheet名</param>
/// <param name="updateData">需更新的数据</param>
/// <param name="coluids">需更新的列号</param>
/// <param name="rowid">需更新的开始行号</param>
public static void UpdateExcel(string outputFile, string sheetname, double[][] updateData, int[] coluids, int rowid)
{
FileStream readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
readfile.Close();
ISheet sheet1 = hssfworkbook.GetSheet(sheetname);
for (int j = 0; j < coluids.Length; j++)
{
for (int i = 0; i < updateData[j].Length; i++)
{
try
{
if (sheet1.GetRow(i + rowid) == null)
{
sheet1.CreateRow(i + rowid);
}
if (sheet1.GetRow(i + rowid).GetCell(coluids[j]) == null)
{
sheet1.GetRow(i + rowid).CreateCell(coluids[j]);
}
sheet1.GetRow(i + rowid).GetCell(coluids[j]).SetCellValue(updateData[j][i]);
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}
}
}
try
{
FileStream writefile = new FileStream(outputFile, FileMode.Create);
hssfworkbook.Write(writefile);
writefile.Close();
}
catch (Exception ex)
{
//wl.WriteLogs(ex.ToString());
}
}

#endregion

#region 读取Excel文件,获取有多少个Sheet数
/// <summary>
/// 读取Excel文件,获取有多少个Sheet数
/// </summary>
/// <param name="filePath">文件地址</param>
/// <returns></returns>
public static int GetSheetNumber(string filePath)
{
int number = 0;
try
{
FileStream readfile = new FileStream(filePath, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
number = hssfworkbook.NumberOfSheets;

}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return number;
}

#endregion

#region 获取Excel文件中,Sheet表单的名字列表
/// <summary>
/// 获取Excel文件中,Sheet表单的名字列表
/// </summary>
/// <param name="filePath">文件地址</param>
/// <returns></returns>
public static ArrayList GetSheetName(string filePath)
{
ArrayList arrayList = new ArrayList();
try
{
FileStream readfile = new FileStream(filePath, FileMode.Open, FileAccess.Read);

HSSFWorkbook hssfworkbook = new HSSFWorkbook(readfile);
for (int i = 0; i < hssfworkbook.NumberOfSheets; i++)
{
arrayList.Add(hssfworkbook.GetSheetName(i));
}
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return arrayList;
}

#endregion

#region 是否是数字
/// <summary>
/// 是否是数字
/// </summary>
/// <param name="message"></param>
/// <param name="result"></param>
/// <returns></returns>
public static bool IsNumeric(String message, out double result)
{
Regex rex = new Regex(@"^[-]?\d+[.]?\d*$");
result = -1;
if (rex.IsMatch(message))
{
result = double.Parse(message);
return true;
}
else
return false;

}

#endregion

#region Excel2007 的导入 导出
/// <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;
}
}

#endregion

}
[/code]

使用说明 我的Excel是这个样子的





调用方法(因为我上传的是 xls 也就是 2003格式的excel所以,这里用的方法就是 2003的方法)

注意:Npoi把 第0列 当做是 Excel的第一列





参考 :/article/4856848.html