NPOI导出EXCEL
# .net NPOI导出Excel
注:本帮助类亲测有效,但代码未做优化,做脚本使用可以,如用于生产,请优化。
NPOI版本:2.5.1
public class NPOIHelper
{
/// <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 Export(DataTable dtSource, string strFileName)
{
using (MemoryStream ms = Export(dtSource))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
public static MemoryStream Export(DataTable dtSource)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();
#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 = (HSSFCellStyle)workbook.CreateCellStyle();
HSSFDataFormat format =(HSSFDataFormat) workbook.CreateDataFormat();
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 = (HSSFSheet)workbook.CreateSheet();
}
#region 列头及样式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
HSSFCellStyle headStyle =(HSSFCellStyle) workbook.CreateCellStyle();
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
HSSFFont font = (HSSFFont)workbook.CreateFont();
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 >3000? 3000: (arrColWidth[column.Ordinal] + 1) * 256);
}
}
#endregion
rowIndex = 1;
}
#endregion
#region 填充内容
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = (HSSFCell)dataRow.CreateCell(column.Ordinal);
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String"://字符串类型
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;
//workbook.Dispose();//一般只用写这一个就OK了,他会遍历并释放所有资源,但当前版本有问题所以只释放sheet
return ms;
}
}
public static bool DataSetToExcel(DataSet ds, string Path)
{
bool result = false;
FileStream fs = null;
XSSFWorkbook workbook = new XSSFWorkbook();
for (int i = 0; i < ds.Tables.Count; i++)
{
XSSFSheet sheet = (XSSFSheet)workbook.CreateSheet(ds.Tables[i].TableName);
XSSFCellStyle dateStyle = (XSSFCellStyle)workbook.CreateCellStyle();
XSSFDataFormat format = (XSSFDataFormat)workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
int rowIndex = 0;
#region 新建表,填充表头,填充列头,样式
if (rowIndex == 0)
{
#region 列头及样式
//{
// XSSFRow headerRow = (XSSFRow)sheet.CreateRow(0);
// XSSFCellStyle headStyle = (XSSFCellStyle)workbook.CreateCellStyle();
// //headStyle.Alignment = CellHorizontalAlignment.CENTER;
// XSSFFont font = (XSSFFont)workbook.CreateFont();
// font.FontHeightInPoints = 10;
// font.Boldweight = 700;
// headStyle.SetFont(font);
//}
{
XSSFRow headerRow = (XSSFRow)sheet.CreateRow(0);
XSSFCellStyle headStyle = (XSSFCellStyle)workbook.CreateCellStyle();
headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
XSSFFont font = (XSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
foreach (DataColumn column in ds.Tables[i].Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
}
}
#endregion
rowIndex = 1;
}
#endregion
foreach (DataRow row in ds.Tables[i].Rows)
{
XSSFRow dataRow = (XSSFRow)sheet.CreateRow(rowIndex);
#region 填充内容
foreach (DataColumn column in ds.Tables[i].Columns)
{
XSSFCell newCell = (XSSFCell)dataRow.CreateCell(column.Ordinal);
string type = row[column].GetType().FullName.ToString();
newCell.SetCellValue(GetValue(row[column].ToString(), type));
}
#endregion
rowIndex++;
}
}
using (fs = File.OpenWrite(Path))
{
workbook.Write(fs);//向打开的这个xls文件中写入数据
result = true;
}
return result;
}
private static string GetValue(string cellValue, string type)
{
object value = string.Empty;
switch (type)
{
case "System.String"://字符串类型
value = cellValue;
break;
case "System.DateTime"://日期类型
System.DateTime dateV;
System.DateTime.TryParse(cellValue, out dateV);
value = dateV;
break;
case "System.Boolean"://布尔型
bool boolV = false;
bool.TryParse(cellValue, out boolV);
value = boolV;
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(cellValue, out intV);
value = intV;
break;
case "System.Decimal"://浮点型
case "System.Double":
double doubV = 0;
double.TryParse(cellValue, out doubV);
value = doubV;
break;
case "System.DBNull"://空值处理
value = string.Empty;
break;
default:
value = string.Empty;
break;
}
return value.ToString();
}
/// <summary>读取excel
/// 默认第一行为标头
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable Import(string strFileName)
{
DataTable dt = new DataTable();
HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = (HSSFSheet)hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
HSSFRow headerRow = (HSSFRow)sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
HSSFCell cell = (HSSFCell)headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (sheet.FirstRowNum + 1); 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);
}
return dt;
}
/// <summary>
/// 将excel导入到datatable
/// </summary>
/// <param name="filePath">excel路径</param>
/// <param name="isColumnName">第一行是否是列名</param>
/// <returns>返回datatable</returns>
public static DataTable ExcelToDataTable(string filePath, bool isColumnName)
{
DataTable dataTable = null;
FileStream fs = null;
DataColumn column = null;
DataRow dataRow = null;
IWorkbook workbook = null;
ISheet sheet = null;
IRow row = null;
ICell cell = null;
int startRow = 0;
try
{
using (fs = File.OpenRead(filePath))
{
// 2007版本
if (filePath.IndexOf(".xlsx") > 0)
workbook = new XSSFWorkbook(fs);
// 2003版本
else if (filePath.IndexOf(".xls") > 0)
workbook = new XSSFWorkbook(fs);
if (workbook != null)
{
for (int sheetIndex = 0; sheetIndex < workbook.NumberOfSheets; sheetIndex++) {
#region 处理逻辑
sheet = workbook.GetSheetAt(sheetIndex);//读取第一个sheet,当然也可以循环读取每个sheet
if (sheet != null)
{
int rowCount = sheet.LastRowNum;//总行数
if (rowCount > 0)
{
IRow firstRow = sheet.GetRow(0);//第一行
int cellCount = firstRow.LastCellNum;//列数
if (dataTable == null)
{
dataTable = new DataTable();
//构建datatable的列
if (isColumnName)
{
startRow = 1;//如果第一行是列名,则从第二行开始读取
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
if (cell != null)
{
if (!string.IsNullOrEmpty( cell.StringCellValue))
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + 1));
dataTable.Columns.Add(column);
}
}
}
if (isColumnName)
{
startRow = 1;
}
//填充行
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
dataRow = dataTable.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = "";
}
else
{
//CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//对时间格式(2015.12.5、2015/12/5、2015-12-5等)的处理
if (format == 14 || format == 31 || format == 57 || format == 58)
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
break;
}
}
}
dataTable.Rows.Add(dataRow);
}
}
break;
}
#endregion
}
}
}
return dataTable;
}
catch (Exception ex)
{
if (fs != null)
{
fs.Close();
}
return null;
}
}
/// <summary>
/// 将excel导入到datatable
/// </summary>
/// <param name="filePath">excel路径</param>
/// <param name="isColumnName">第一行是否是列名</param>
/// <returns>返回datatable</returns>
public static DataSet ExcelToDataSet(string filePath, bool isColumnName)
{
DataSet ds = new DataSet();
FileStream fs = null;
DataColumn column = null;
DataRow dataRow = null;
IWorkbook workbook = null;
ISheet sheet = null;
IRow row = null;
ICell cell = null;
int startRow = 0;
try
{
using (fs = File.OpenRead(filePath))
{
// 2007版本
if (filePath.IndexOf(".xlsx") > 0)
workbook = new XSSFWorkbook(fs);
// 2003版本
else if (filePath.IndexOf(".xls") > 0)
workbook = new XSSFWorkbook(fs);
if (workbook != null)
{
for (int sheetIndex = 0; sheetIndex < workbook.NumberOfSheets; sheetIndex++)
{
#region 处理逻辑
sheet = workbook.GetSheetAt(sheetIndex);//读取第一个sheet,当然也可以循环读取每个sheet
if (sheet != null)
{
DataTable dataTable = null;
int rowCount = sheet.LastRowNum;//总行数
if (rowCount > 0)
{
IRow firstRow = sheet.GetRow(0);//第一行
int cellCount = firstRow.LastCellNum;//列数
if (dataTable == null)
{
dataTable = new DataTable();
//构建datatable的列
if (isColumnName)
{
startRow = 1;//如果第一行是列名,则从第二行开始读取
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
if (cell != null)
{
if (cell.StringCellValue != null)
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + 1));
dataTable.Columns.Add(column);
}
}
}
if (isColumnName)
{
startRow = 1;
}
//填充行
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
dataRow = dataTable.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = "";
}
else
{
//CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//对时间格式(2015.12.5、2015/12/5、2015-12-5等)的处理
if (format == 14 || format == 31 || format == 57 || format == 58)
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
break;
}
}
}
dataTable.Rows.Add(dataRow);
}
}
ds.Tables.Add(dataTable);
}
#endregion
}
}
}
return ds;
}
catch (Exception ex)
{
if (fs != null)
{
fs.Close();
}
return null;
}
}
}
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上次更新: 2023/05/09, 17:54:37