使用NOPI导入导出Excel
最近项目需要对Excel数据进行导入导出操作，决定使用NOPI插件来进行。
至于为什么，自行百度。
网上的Demo很多都是12年左右，只有Excel2003格式的操作，而且NOPI的版本也比较旧了。
你可以去NOPI官网下载最新的动态链接库，我这里用到的是2.2.1，以后建议大家也demo的时候最好带上版本号。
本文最大的优点是 兼容了2003以及2007及以上格式。
1.导出Excel的时候这两种格式有个最大的不同就是最大行数的不同2003是65535行，2007及以上是1048576行，
2.导入或者说读取Excel的时候使用了NOPI自带的一个工程类WorkBootFactory，通过文件流自动判断格式。
废话不多说了，放代码了。
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using NPOI.HSSF.UserModel;
using NPOI.SS.Formula.Eval;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;
namespace Vevisoft.Utility.NPOIExcel
{
public class ExcelHelper
{
public enum ExcelStyle
{
Office2003 = 0,
Office2007AndAbove = 1
}
#region 从datatable中将数据导出到excel
/// <summary>
/// 导出DataTable到流，此方法包含所有格式。
/// 2003 最大行数为65535，2007及以上为1048576
/// </summary>
/// <param name="dtSource"></param>
/// <param name="strHeaderText"></param>
/// <param name="excellStyle"></param>
/// <returns></returns>
static MemoryStream ExportDt(DataTable dtSource, string strHeaderText, ExcelStyle excellStyle=ExcelStyle.Office2007AndAbove)
{
IWorkbook workbook = new XSSFWorkbook();
if (excellStyle == ExcelStyle.Office2003)
workbook = new HSSFWorkbook();
//
var sheet = workbook.CreateSheet();
//
//
var dateStyle = workbook.CreateCellStyle();
var format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
//取得列宽
var arrColWidths = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidths[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName).Length;
}
for (var i = 0; i < dtSource.Rows.Count; i++)
{
for (var j = 0; j < dtSource.Columns.Count; j++)
{
var intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidths[j])
{
arrColWidths[j] = intTemp;
}
}
}
var rowIndex = 0;
var maxRows = excellStyle == ExcelStyle.Office2003 ? 65535 : 1048576;
foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == maxRows || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 表头及样式
{
var headerRow = sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue(strHeaderText);
var headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
var font = workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);
headerRow.GetCell(0).CellStyle = headStyle;
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}
#endregion
#region 列头及样式
{
var headerRow = sheet.CreateRow(1);
var headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
var font = 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, (arrColWidths[column.Ordinal] + 1) * 256);
}
//headerRow.Dispose();
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充内容
var dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
var newCell = dataRow.CreateCell(column.Ordinal);
var 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;
}
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;
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;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal": //浮点型
case "System.Double":
double doubV;
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 (var ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
//sheet.Dispose();
//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 ExportDTtoExcel2003(DataTable dtSource, string strHeaderText, string strFileName)
{
using (var ms = ExportDt(dtSource, strHeaderText, ExcelStyle.Office2003))
{
using (var fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
var data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
/// <summary>
/// DataTable导出到Excel文件,格式为2007及以上格式
/// </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 (var ms = ExportDt(dtSource, strHeaderText))
{
using (var fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
var data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
#endregion
#region 从excel中将数据导出到datatable
/// <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 ImportExceltoDt(string strFileName)
{
IWorkbook workbook;
using (var file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
workbook = WorkbookFactory.Create(file);
var sheet = workbook.GetSheetAt(0);
var dt = ImportDt(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 ImportExceltoDt(string strFileName, string sheetName, int headerRowIndex)
{
IWorkbook workbook;
using (var file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
workbook = WorkbookFactory.Create(file);
var sheet = workbook.GetSheet(sheetName);
var table = ImportDt(sheet, headerRowIndex, true);
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 ImportExceltoDt(string strFileName, int sheetIndex, int headerRowIndex)
{
IWorkbook workbook;
using (var file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
workbook = WorkbookFactory.Create(file);
ISheet sheet = workbook.GetSheetAt(sheetIndex);
var table = ImportDt(sheet, headerRowIndex, true);
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"></param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, string sheetName, int headerRowIndex, bool needHeader)
{
IWorkbook workbook;
using (var file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
workbook = WorkbookFactory.Create(file);
var sheet = workbook.GetSheet(sheetName);
var table = ImportDt(sheet, headerRowIndex, needHeader);
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"></param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, int sheetIndex, int headerRowIndex, bool needHeader)
{
IWorkbook workbook;
using (var file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
workbook = WorkbookFactory.Create(file);
var sheet = workbook.GetSheetAt(sheetIndex);
var table = ImportDt(sheet, headerRowIndex, needHeader);
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"></param>
/// <returns></returns>
static DataTable ImportDt(ISheet sheet, int headerRowIndex, bool needHeader)
{
var table = new DataTable();
IRow headerRow;
int cellCount;
try
{
if (headerRowIndex < 0 || !needHeader)
{
headerRow = sheet.GetRow(0);
cellCount = headerRow.LastCellNum;
for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
var column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else
{
headerRow = sheet.GetRow(headerRowIndex);
cellCount = headerRow.LastCellNum;
for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
if (headerRow.GetCell(i) == null)
{
if (table.Columns.IndexOf(Convert.ToString(i)) > 0)
{
var column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
var column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
else if (table.Columns.IndexOf(headerRow.GetCell(i).ToString()) > 0)
{
var column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
{
var column = new DataColumn(headerRow.GetCell(i).ToString());
table.Columns.Add(column);
}
}
}
//var rowCount = sheet.LastRowNum;
for (var i = (headerRowIndex + 1); i <= sheet.LastRowNum; i++)
{
try
{
IRow row;
row = sheet.GetRow(i) ?? sheet.CreateRow(i);
var 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:
var str = row.GetCell(j).StringCellValue;
dataRow[j] = !string.IsNullOrEmpty(str) ? str : 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:
var strFormula = row.GetCell(j).StringCellValue;
dataRow[j] = !string.IsNullOrEmpty(strFormula)
? strFormula
: 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
{
//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 Public Methodes
public static bool IsNumeric(String message, out double result)
{
var rex = new Regex(@"^[-]?\d+[.]?\d*$");
result = -1;
if (rex.IsMatch(message))
{
result = double.Parse(message);
return true;
}
return false;
}
/// <summary>
/// 获取Sheet个数
/// </summary>
/// <param name="outputFile"></param>
/// <returns></returns>
public static int GetSheetCount(string outputFile)
{
var count = 0;
try
{
var readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);
var workbook = WorkbookFactory.Create(readfile);
count = workbook.NumberOfSheets;
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return count;
}
/// <summary>
/// 获取Sheet名称列表
/// </summary>
/// <param name="outputFile"></param>
/// <returns></returns>
public static IList<string> GetSheetNames(string outputFile)
{
IList<string> sheetNameList = new List<string>();
try
{
var readfile = new FileStream(outputFile, FileMode.Open, FileAccess.Read);
var workbook = WorkbookFactory.Create(readfile);
for (var i = 0; i < workbook.NumberOfSheets; i++)
sheetNameList.Add(workbook.GetSheetName(i));
}
catch (Exception exception)
{
//wl.WriteLogs(exception.ToString());
}
return sheetNameList;
}
#endregion
}
}