NPOI使用教程附Helper

时间:2023-01-28 09:05:56

1 NPOI简介

1.1 NPOI是什么

  NPOI是POI的.NET版本,POI是一套用Java写成的库,我们在开发中经常用到导入导出表格、文档的情况,NPOI能够帮助我们在没有安装微软Office的情况下读写Office文件,如xls, doc, ppt等。NPOI采用的是Apache 2.0许可证(poi也是采用这个许可证),这意味着它可以被用于任何商业或非商业项目,我们不用担心因为使用它而必须开放你自己的源代码,所以它对于很多从事业务系统开发的公司来说绝对是很不错的选择。

1.2 NPOI简单使用

  NPOI的API十分人性化,使用起来非常容易上手。首先创建一个控制台应用程序,通过nuget获取NPOI,这里使用的是最新版本2.4.0,如下:

NPOI使用教程附Helper

  项目引入NPOI后就可以直接上手使用了,代码如下

        static void Main(string[] args)
{
//创建workbook,说白了就是在内存中创建一个Excel文件
IWorkbook workbook = new HSSFWorkbook();
//要添加至少一个sheet,没有sheet的excel是打不开的
ISheet sheet1 = workbook.CreateSheet("sheet1");
ISheet sheet2 = workbook.CreateSheet("sheet2"); IRow row1 = sheet1.CreateRow();//添加第1行,注意行列的索引都是从0开始的
ICell cell1 = row1.CreateCell();//给第1行添加第1个单元格
cell1.SetCellValue("hello npoi!");//给单元格赋值
//上边3个步骤合在一起:sheet1.CreateRow(0).CreateCell(0).SetCellValue("hello npoi"); //获取第一行第一列的string值
Console.WriteLine(sheet1.GetRow().GetCell().StringCellValue); //输出:hello npoi //写入文件
using (FileStream file = new FileStream(@"D:/TestFiles/test.xls", FileMode.Create))
{
workbook.Write(file);
}
}

运行代码,结果如下,同时也在D盘的TestFiles文件夹下创建了test.xls文件

NPOI使用教程附Helper

NPOI使用教程附Helper

2 NPOI使用详解

2.1 单元格数据格式

  用过Excel的人都知道,单元格是Excel最有意义的东西,我们做任何操作恐怕都要和单元格打交道。在Excel中我们经常要设置格式,比如说日期格式(2018-1-1)、小数点格式(1.20)、货币格式($2000)、百分比格式(99.99%)等等,这些东西在过去我们恐怕只能在服务器端生成好,不但增加了服务器端的代码量,还造成了不必要的字符串替换操作,如今NPOI将让服务器从这种完全没有必要的操作中解放出来,一切都将由Excel在客户端处理。

  使用NPOI时要注意,所有的格式都是通过 CellStyle.DataFormat 赋给单元格的,而不是直接赋给单元格,设置单元格数据展示的格式有两种方法。

1.设置excel中内置的格式:

excel内部设置了很多格式,如下图所示:

NPOI使用教程附Helper

如果我们想使用这些内置的格式,可用通过 DataFormat.GetBuildinFormat('格式') 来使用,使用实例如下:

cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00");  //两位小数,内置格式

2.设置自定义格式

  有时候内置的格式不能满足我们的要求,这时候就可以使用 workbook.CreateDataFormat().GetFormat("格式") 自定义格式了,使用语法如下:

cellStyle.DataFormat= workbook.CreateDataFormat().GetFormat("yyyy年m月d日 hh时mm分ss秒");//显示中文日期和时间,自定义格式

下边的栗子展示了几种常用的数据格式用法:

       static void Main(string[] args)
{
IWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("new sheet");
//设置日期格式,2018年5月5日格式
ICell cell = sheet.CreateRow().CreateCell();
cell.SetCellValue(new DateTime(, , , , , ));
ICellStyle cellStyle = workbook.CreateCellStyle();
cellStyle.DataFormat = workbook.CreateDataFormat().GetFormat("yyyy年m月d日 hh时mm分ss秒");
//cellStyle.DataFormat = workbook.CreateDataFormat().GetFormat("yyyy/mm/dd hh:mm:ss");
cell.CellStyle = cellStyle; //保留2位小数
ICell cell2 = sheet.CreateRow().CreateCell();
cell2.SetCellValue(12.346666);
ICellStyle cellStyle2 = workbook.CreateCellStyle();
cellStyle2.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00");
cell2.CellStyle = cellStyle2; //货币格式
ICell cell3 = sheet.CreateRow().CreateCell();
cell3.SetCellValue(1234.66666);
ICellStyle cellStyle3 = workbook.CreateCellStyle();
cellStyle3.DataFormat = workbook.CreateDataFormat().GetFormat("¥#,##0.00");//美元的话格式为 $#,##0.00,其中#,##0表示千分号
cell3.CellStyle = cellStyle3; //百分比
ICell cell4 = sheet.CreateRow().CreateCell();
cell4.SetCellValue(1.236666);
ICellStyle cellStyle4 = workbook.CreateCellStyle();
//cellStyle4.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00%");//保留两位小数
cellStyle4.DataFormat = HSSFDataFormat.GetBuiltinFormat("0%");
cell4.CellStyle = cellStyle4; //中文大写数字
ICell cell5 = sheet.CreateRow().CreateCell();
cell5.SetCellValue();
ICellStyle cellStyle5 = workbook.CreateCellStyle();
cellStyle5.DataFormat = workbook.CreateDataFormat().GetFormat("[DbNum2][$-804]0.00");//不保留小数: [DbNum2][$-804]0
cell5.CellStyle = cellStyle5; //科学计数法
ICell cell6 = sheet.CreateRow().CreateCell();
cell6.SetCellValue(1234.6666);
ICellStyle cellStyle6 = workbook.CreateCellStyle();
cellStyle6.DataFormat = HSSFDataFormat.GetBuiltinFormat("0.00E+00");
cell6.CellStyle = cellStyle6; using (FileStream file = new FileStream(@"D:/TestFiles/test.xls", FileMode.Create))
{
workbook.Write(file);
}
}

运行程序,生成的excel文件如下所示:

NPOI使用教程附Helper

2.2 单元格合并及设置风格

  单元格的合并和风格这部分内容比较多,但是Api十分的简单,为了看起来清晰,我们分成两个栗子来演示这部分的功能,代码中的注释很详细,这里就直接上代码了

1.第一个栗子演示单元格合并,内容停靠,字体风格颜色大小等

       static void Main(string[] args)
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1"); //------------------单元格合并
sheet.AddMergedRegion(new CellRangeAddress(, , , ));//合并单元格,4个参数依次为为startRow,endRow,startCol,endCol
ICell cell = sheet.CreateRow().CreateCell();
cell.SetCellValue("合并的区域");
cell.Row.HeightInPoints = ;//行高
ICellStyle cellstyle = workbook.CreateCellStyle(); //----------------设置单元格常用风格
cellstyle.Alignment = HorizontalAlignment.Left;//水平居左,可选Right,Center
cellstyle.VerticalAlignment = VerticalAlignment.Bottom;//垂直居中,可选Top,Center
cellstyle.WrapText = true;//自动换行 cellstyle.Indention = ;//缩进4个字节
//cellstyle.Rotation = 90;//字体旋转90度,取值范围是[-90,90] //---------------字体,字体大小、颜色
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;//字号为24,可以用font.FontHeight = 24 * 20;FontHeight的单位是1/20点 font.FontName = "楷体";//字体
font.Boldweight = ;//加粗
font.Color = HSSFColor.Blue.Index;//字体颜色
cellstyle.SetFont(font);
cell.CellStyle = cellstyle;
using (FileStream file = new FileStream(@"D:/TestFiles/test.xls", FileMode.Create))
{
workbook.Write(file);
}
}

生成的excel文件如下图所示:

NPOI使用教程附Helper

2.第二个栗子演示单元格的宽高、背景色、边框风格等

       static void Main(string[] args)
{
IWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1"); ICell cell = sheet.CreateRow().CreateCell();
cell.SetCellValue("hello");
ICellStyle cellstyle = workbook.CreateCellStyle();
//设置宽度,把第2列设成20字节宽;参数1指定列的索引;参数2指定宽度,单位是1/256个字符宽度
sheet.SetColumnWidth(, * );
//高度设成40,单位是点;也可以用cell2.Row.Height = 40 * 20;Height的单位是1/20点
cell.Row.HeightInPoints = ;
//右边框设置成点画线
cellstyle.BorderRight = BorderStyle.MediumDashDot;
//右边框设成粉色
cellstyle.RightBorderColor = HSSFColor.Pink.Index;
//前景色填充模式,实心
cellstyle.FillPattern = FillPattern.SolidForeground;
//前景色填充颜色,黄色
cellstyle.FillForegroundColor = HSSFColor.Yellow.Index;
//背景色
//cellstyle2.FillBackgroundColor = HSSFColor.Green.Index;//背景色设成green
cell.CellStyle = cellstyle; using (FileStream file = new FileStream(@"D:/TestFiles/test.xls", FileMode.Create))
{
workbook.Write(file);
}
}

运行程序,生成的excel文件如下:

NPOI使用教程附Helper

  其实在NPOI中除了操作单元格的内容和风格外,还提供了添加excel文件摘要,添加批注,画图,使用公式等功能,但是这些功能我们用的比较少,所以就不一一展示了,NPOI的公式我自己很少去使用,一般通过程序直接计算结果,个人感觉在程序中计算更加灵活,当excel的结构发生变化时修改起来也更方便些。

3.封装一个NPOI的helper类

  我们先看一下这个helper的使用吧,先看从DataTable导出到excel,

  首先使用Nuget添加几个包:NPOI,log4net(其他的日志记录组件也可以),System.Text.Encoding.CodePages(为了支持gb2312),具体代码如下:

  class Program
{
static void Main(string[] args)
{
log4net.Config.XmlConfigurator.Configure();
       //用于支持gb2312
       Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
//测试dataTable数据源
DataTable dataTable = new DataTable();
dataTable.Columns.Add("id", typeof(int));
dataTable.Columns.Add("uname", typeof(string));
dataTable.Columns.Add("sex", typeof(string));
dataTable.Columns.Add("age", typeof(int));
dataTable.Columns.Add("pwd", typeof(string));
dataTable.Columns.Add("email", typeof(string));
dataTable.Columns.Add("address", typeof(string));
Random r = new Random();
for (int i = ; i < ; i++)
{
DataRow row = dataTable.NewRow();
row["id"] = i;
row["uname"] = "hellox" + i.ToString();
row["sex"] = r.Next() % == ? "男" : "女";
row["age"] = r.Next() + ;
row["pwd"] = "pwd" + r.Next().ToString();
row["email"] = r.Next() + "@qq.com";
row["address"] = $"北京市,西{r.Next(4) + 1}环,xx路{r.Next(100)}号";
dataTable.Rows.Add(row);
}
//DataTable的列名和excel的列名对应字典,因为excel的列名一般是中文的,DataTable的列名是英文的,字典主要是存储excel和DataTable列明的对应关系,当然我们也可以把这个对应关系存在配置文件或者其他地方
Dictionary<string, string> dir = new Dictionary<string, string>();
dir.Add("id", "编号");
dir.Add("uname", "用户");
dir.Add("sex", "性别");
dir.Add("age", "年龄");
dir.Add("pwd", "密码");
dir.Add("email", "邮箱");
dir.Add("address", "住址"); //使用helper类导出DataTable数据到excel表格中,参数依次是 (DataTable数据源; excel表名; excel存放位置的绝对路径; 列名对应字典; 是否清空以前的数据,设置为false,表示内容追加; 每个sheet放的数据条数,如果超过该条数就会新建一个sheet存储)
NPOIHelper.ExportDTtoExcel(dataTable, "考勤信息表", @"C:\Users\ZDZN\Desktop/Hello.xlsx", dir, false, ); }
}

  运行程序,当一个sheet的数目满了后会新生产一个sheet1来存储,效果如下:

NPOI使用教程附Helper

接下来测试读取excel中的数据到datatable中,我们就读取刚才生成的excel中的数据到DataTable中去:

 static void Main(string[] args)
{
log4net.Config.XmlConfigurator.Configure();
  //用于支持gb2312
       Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
//DataTable的列名和excel的列名对应字典
Dictionary<string, string> dir = new Dictionary<string, string>();
dir.Add("id", "编号");
dir.Add("uname", "用户");
dir.Add("sex", "性别");
dir.Add("age", "年龄");
dir.Add("pwd", "密码");
dir.Add("email", "邮箱");
dir.Add("address", "住址"); //读取数据到DataTable,参数依此是(excel文件路径,列名对应字典,列名所在行,sheet索引)
DataTable dt = NPOIHelper.ImportExceltoDt(@"C:\Users\ZDZN\Desktop/Hello11.xlsx", dir, , );
//遍历DataTable---------------------------
foreach (DataColumn item in dt.Columns)
{
//显示dataTable的列名
Console.Write(item.ColumnName + new string('-', ));
}
Console.WriteLine();
//遍历DataTable中的数据
foreach (DataRow row in dt.Rows)
{
for (int i = ; i < dt.Columns.Count; i++)
{
Console.Write(row[i].ToString() + new string(' ', )); }
Console.WriteLine();
} Console.WriteLine("ok");
Console.ReadKey();
}

程序运行如下:

NPOI使用教程附Helper

上边例子中的helper兼容了xls和xlsx两种格式,通过helper只需要一行代码就可以快速地进行excel和datatable间的数据转换,helper附件如下

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using NPOI.HSSF.UserModel;
using NPOI.SS.Formula.Eval;
using NPOI.SS.UserModel;
using System.Linq;
using NPOI.SS.Util;
using System.Text.RegularExpressions;
using NPOI.XSSF.UserModel;
using log4net; public class NPOIHelper
{
private static ILog loger = LogManager.GetLogger("myLogger"); #region 从DataTable导出到excel文件中,支持xls和xlsx格式
#region 导出为xls文件内部方法
/// <summary>
/// 从datatable 中导出到excel
/// </summary>
/// <param name="strFileName">excel文件名</param>
/// <param name="dtSource">datatabe源数据</param>
/// <param name="strHeaderText">表名</param>
/// <param name="sheetnum">sheet的编号</param>
/// <returns></returns>
static MemoryStream ExportDT(String strFileName, DataTable dtSource, string strHeaderText, Dictionary<string, string> dir, int sheetnum)
{
//创建工作簿和sheet
IWorkbook workbook = new HSSFWorkbook();
using (Stream writefile = new FileStream(strFileName, FileMode.OpenOrCreate, FileAccess.Read))
{
if (writefile.Length > && sheetnum > )
{
workbook = WorkbookFactory.Create(writefile);
}
} ISheet sheet = null;
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding().GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = ; i < dtSource.Rows.Count; i++)
{
for (int j = ; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding().GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = ;
foreach (DataRow row in dtSource.Rows)
{
#region 新建表,填充表头,填充列头,样式
if (rowIndex == )
{
string sheetName = strHeaderText + (sheetnum == ? "" : sheetnum.ToString());
if (workbook.GetSheetIndex(sheetName) >= )
{
workbook.RemoveSheetAt(workbook.GetSheetIndex(sheetName));
}
sheet = workbook.CreateSheet(sheetName);
#region 表头及样式
{
sheet.AddMergedRegion(new CellRangeAddress(, , , dtSource.Columns.Count - ));
IRow headerRow = sheet.CreateRow();
headerRow.HeightInPoints = ;
headerRow.CreateCell().SetCellValue(strHeaderText);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;
font.Boldweight = ;
headStyle.SetFont(font);
headerRow.GetCell().CellStyle = headStyle; rowIndex = ;
}
#endregion #region 列头及样式 if (rowIndex == )
{
IRow headerRow = sheet.CreateRow();//第二行设置列名
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;
font.Boldweight = ;
headStyle.SetFont(font);
//写入列标题
foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(dir[column.ColumnName]);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + ) * * );
}
rowIndex = ;
}
#endregion
}
#endregion #region 填充内容 IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String": //字符串类型
double result;
if (isNumeric(drValue, out result))
{
//数字字符串
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 = ;
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(drValue.ToString());
break;
} }
#endregion
rowIndex++;
} using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = ;
return ms;
} }
#endregion #region 导出为xlsx文件内部方法
/// <summary>
/// 从datatable 中导出到excel
/// </summary>
/// <param name="dtSource">datatable数据源</param>
/// <param name="strHeaderText">表名</param>
/// <param name="fs">文件流</param>
/// <param name="readfs">内存流</param>
/// <param name="sheetnum">sheet索引</param>
static void ExportDTI(DataTable dtSource, string strHeaderText, FileStream fs, MemoryStream readfs, Dictionary<string, string> dir, int sheetnum)
{ IWorkbook workbook = new XSSFWorkbook();
if (readfs.Length > && sheetnum > )
{
workbook = WorkbookFactory.Create(readfs);
}
ISheet sheet = null;
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = 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().GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = ; i < dtSource.Rows.Count; i++)
{
for (int j = ; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding().GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = ; foreach (DataRow row in dtSource.Rows)
{
#region 新建表,填充表头,填充列头,样式 if (rowIndex == )
{
#region 表头及样式
{
string sheetName = strHeaderText + (sheetnum == ? "" : sheetnum.ToString());
if (workbook.GetSheetIndex(sheetName) >= )
{
workbook.RemoveSheetAt(workbook.GetSheetIndex(sheetName));
}
sheet = workbook.CreateSheet(sheetName);
sheet.AddMergedRegion(new CellRangeAddress(, , , dtSource.Columns.Count - ));
IRow headerRow = sheet.CreateRow();
headerRow.HeightInPoints = ;
headerRow.CreateCell().SetCellValue(strHeaderText); ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;
font.Boldweight = ;
headStyle.SetFont(font);
headerRow.GetCell().CellStyle = headStyle;
}
#endregion #region 列头及样式
{
IRow headerRow = sheet.CreateRow();
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = ;
font.Boldweight = ;
headStyle.SetFont(font); foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(dir[column.ColumnName]);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + ) * * );
}
} #endregion rowIndex = ;
}
#endregion #region 填充内容
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
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 = ;
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(drValue.ToString());
break;
}
}
#endregion
rowIndex++;
}
workbook.Write(fs);
fs.Close();
}
#endregion #region 导出excel表格
/// <summary>
/// DataTable导出到Excel文件,xls文件
/// </summary>
/// <param name="dtSource">数据源</param>
/// <param name="strHeaderText">表名</param>
/// <param name="strFileName">excel文件名</param>
/// <param name="dir">datatable和excel列名对应字典</param>
/// <param name="sheetRow">每个sheet存放的行数</param>
public static void ExportDTtoExcel(DataTable dtSource, string strHeaderText, string strFileName, Dictionary<string, string> dir, bool isNew, int sheetRow = )
{
int currentSheetCount = GetSheetNumber(strFileName);//现有的页数sheetnum
if (sheetRow <= )
{
sheetRow = dtSource.Rows.Count;
}
string[] temp = strFileName.Split('.');
string fileExtens = temp[temp.Length - ];
int sheetCount = (int)Math.Ceiling((double)dtSource.Rows.Count / sheetRow);//sheet数目
if (temp[temp.Length - ] == "xls" && dtSource.Columns.Count < && sheetRow < )
{
if (isNew)
{
currentSheetCount = ;
}
for (int i = currentSheetCount; i < currentSheetCount + sheetCount; i++)
{
DataTable pageDataTable = dtSource.Clone();
int hasRowCount = dtSource.Rows.Count - sheetRow * (i - currentSheetCount) < sheetRow ? dtSource.Rows.Count - sheetRow * (i - currentSheetCount) : sheetRow;
for (int j = ; j < hasRowCount; j++)
{
pageDataTable.ImportRow(dtSource.Rows[(i - currentSheetCount) * sheetRow + j]);
} using (MemoryStream ms = ExportDT(strFileName, pageDataTable, strHeaderText, dir, i))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{ byte[] data = ms.ToArray();
fs.Write(data, , data.Length);
fs.Flush();
}
}
}
}
else
{
if (temp[temp.Length - ] == "xls")
strFileName = strFileName + "x";
if (isNew)
{
currentSheetCount = ;
}
for (int i = currentSheetCount; i < currentSheetCount + sheetCount; i++)
{
DataTable pageDataTable = dtSource.Clone();
int hasRowCount = dtSource.Rows.Count - sheetRow * (i - currentSheetCount) < sheetRow ? dtSource.Rows.Count - sheetRow * (i - currentSheetCount) : sheetRow;
for (int j = ; j < hasRowCount; j++)
{
pageDataTable.ImportRow(dtSource.Rows[(i - currentSheetCount) * sheetRow + j]);
}
FileStream readfs = new FileStream(strFileName, FileMode.OpenOrCreate, FileAccess.Read);
MemoryStream readfsm = new MemoryStream();
readfs.CopyTo(readfsm);
readfs.Close();
using (FileStream writefs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{ ExportDTI(pageDataTable, strHeaderText, writefs, readfsm, dir, i);
}
readfsm.Close();
}
}
}
#endregion
#endregion #region 从excel文件中将数据导出到datatable/datatable
/// <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="dir">excel列名和DataTable列名的对应字典</param>
/// <returns></returns>
static DataTable ImportDt(ISheet sheet, int HeaderRowIndex, Dictionary<string, string> dir)
{
DataTable table = new DataTable();
IRow headerRow;
int cellCount;
try
{
//没有标头或者不需要表头用excel列的序号(1,2,3..)作为DataTable的列名
if (HeaderRowIndex < )
{
headerRow = sheet.GetRow();
cellCount = headerRow.LastCellNum; for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
DataColumn column = new DataColumn(Convert.ToString(i));
table.Columns.Add(column);
}
}
//有表头,使用表头做为DataTable的列名
else
{
headerRow = sheet.GetRow(HeaderRowIndex);
cellCount = headerRow.LastCellNum;
for (int i = headerRow.FirstCellNum; i <= cellCount; i++)
{
//如果excel某一列列名不存在:以该列的序号作为Datatable的列名,如果DataTable中包含了这个序列为名的列,那么列名为重复列名+序号
if (headerRow.GetCell(i) == null)
{
if (table.Columns.IndexOf(Convert.ToString(i)) > )
{
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);
} }
//excel中的某一列列名不为空,但是重复了:对应的Datatable列名为“重复列名+序号”
else if (table.Columns.IndexOf(headerRow.GetCell(i).ToString()) > )
{
DataColumn column = new DataColumn(Convert.ToString("重复列名" + i));
table.Columns.Add(column);
}
else
//正常情况,列名存在且不重复:用excel中的列名作为datatable中对应的列名
{
string colName = dir.Where(s => s.Value == headerRow.GetCell(i).ToString()).First().Key;
DataColumn column = new DataColumn(colName);
table.Columns.Add(column);
}
}
}
int rowCount = sheet.LastRowNum;
for (int i = (HeaderRowIndex + ); i <= sheet.LastRowNum; i++)//excel行遍历
{
try
{
IRow row;
if (sheet.GetRow(i) == null)//如果excel有空行,则添加缺失的行
{
row = sheet.CreateRow(i);
}
else
{
row = sheet.GetRow(i);
} DataRow dataRow = table.NewRow(); for (int j = row.FirstCellNum; j <= cellCount; j++)//excel列遍历
{
try
{
if (row.GetCell(j) != null)
{
switch (row.GetCell(j).CellType)
{
case CellType.String://字符串
string str = row.GetCell(j).StringCellValue;
if (str != null && str.Length > )
{
dataRow[j] = str.ToString();
}
else
{
dataRow[j] = default(string);
}
break;
case CellType.Numeric://数字
if (DateUtil.IsCellDateFormatted(row.GetCell(j)))//时间戳数字
{
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://公式
switch (row.GetCell(j).CachedFormulaResultType)
{
case CellType.String:
string strFORMULA = row.GetCell(j).StringCellValue;
if (strFORMULA != null && strFORMULA.Length > )
{
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)
{
loger.Error(exception.ToString());
}
}
table.Rows.Add(dataRow);
}
catch (Exception exception)
{
loger.Error(exception.ToString());
}
}
}
catch (Exception exception)
{
loger.Error(exception.ToString());
}
return table;
} /// <summary>
/// 读取Excel文件特定名字sheet的内容到DataTable
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <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="dir">excel列名和DataTable列名的对应字典</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, Dictionary<string, string> dir, string SheetName, int HeaderRowIndex = )
{
DataTable table = new DataTable();
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
if (file.Length > )
{
IWorkbook wb = WorkbookFactory.Create(file);
ISheet isheet = wb.GetSheet(SheetName);
table = ImportDt(isheet, HeaderRowIndex, dir);
isheet = null;
}
}
return table;
} /// <summary>
/// 读取Excel文件某一索引sheet的内容到DataTable
/// </summary>
/// <param name="strFileName">excel文件路径</param>
/// <param name="sheet">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="dir">excel列名和DataTable列名的对应字典</param>
/// <returns></returns>
public static DataTable ImportExceltoDt(string strFileName, Dictionary<string, string> dir, int HeaderRowIndex = , int SheetIndex = )
{
DataTable table = new DataTable();
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
if (file.Length > )
{
IWorkbook wb = WorkbookFactory.Create(file);
ISheet isheet = wb.GetSheetAt(SheetIndex);
table = ImportDt(isheet, HeaderRowIndex, dir);
isheet = null;
}
}
return table; }
#endregion /// <summary>
/// 获取excel文件的sheet数目
/// </summary>
/// <param name="outputFile"></param>
/// <returns></returns>
public static int GetSheetNumber(string outputFile)
{
int number = ;
using (FileStream readfile = new FileStream(outputFile, FileMode.OpenOrCreate, FileAccess.Read))
{
if (readfile.Length > )
{
IWorkbook wb = WorkbookFactory.Create(readfile);
number = wb.NumberOfSheets;
}
}
return number;
} /// <summary>
/// 判断内容是否是数字
/// </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 = -;
if (rex.IsMatch(message))
{
result = double.Parse(message);
return true;
}
else
return false;
} /// <summary>
/// 验证导入的Excel是否有数据
/// </summary>
/// <param name="excelFileStream"></param>
/// <returns></returns>
public static bool HasData(Stream excelFileStream)
{
using (excelFileStream)
{
IWorkbook workBook = new HSSFWorkbook(excelFileStream);
if (workBook.NumberOfSheets > )
{
ISheet sheet = workBook.GetSheetAt();
return sheet.PhysicalNumberOfRows > ;
}
}
return false;
}
}