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原文地址:http://www.cnblogs.com/luxiaoxun/p/3374992.html
1、整个Excel表格叫做工作表:WorkBook(工作薄),包含的叫页(工作表):Sheet;行:Row;单元格Cell。
2、NPOI是POI的C#版本,NPOI的行和列的index都是从0开始
3、POI读取Excel有两种格式一个是HSSF,另一个是XSSF。 HSSF和XSSF的区别如下:
HSSF is the POI Project's pure Java implementation of the Excel '97(-2007) file format.
XSSF is the POI Project's pure Java implementation of the Excel 2007 OOXML (.xlsx) file format.
即:HSSF适用2007以前的版本,XSSF适用2007版本及其以上的。
下面是用NPOI读写Excel的例子:ExcelHelper封装的功能主要是把DataTable中数据写入到Excel中,或者是从Excel读取数据到一个DataTable中。
ExcelHelper类:
测试代码:
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Data;
- namespace NPOIExcelExample
- {
- class Program
- {
- static DataTable GenerateData()
- {
- DataTable data = new DataTable();
- for (int i = 0; i < 5; ++i)
- {
- data.Columns.Add("Columns_" + i.ToString(), typeof(string));
- }
- for (int i = 0; i < 10; ++i)
- {
- DataRow row = data.NewRow();
- row["Columns_0"] = "item0_" + i.ToString();
- row["Columns_1"] = "item1_" + i.ToString();
- row["Columns_2"] = "item2_" + i.ToString();
- row["Columns_3"] = "item3_" + i.ToString();
- row["Columns_4"] = "item4_" + i.ToString();
- data.Rows.Add(row);
- }
- return data;
- }
- static void PrintData(DataTable data)
- {
- if (data == null) return;
- for (int i = 0; i < data.Rows.Count; ++i)
- {
- for (int j = 0; j < data.Columns.Count; ++j)
- Console.Write("{0} ", data.Rows[i][j]);
- Console.Write("\n");
- }
- }
- static void TestExcelWrite(string file)
- {
- try
- {
- using (ExcelHelper excelHelper = new ExcelHelper(file))
- {
- DataTable data = GenerateData();
- int count = excelHelper.DataTableToExcel(data, "MySheet", true);
- if (count > 0)
- Console.WriteLine("Number of imported data is {0} ", count);
- }
- }
- catch (Exception ex)
- {
- Console.WriteLine("Exception: " + ex.Message);
- }
- }
- static void TestExcelRead(string file)
- {
- try
- {
- using (ExcelHelper excelHelper = new ExcelHelper(file))
- {
- DataTable dt = excelHelper.ExcelToDataTable("MySheet", true);
- PrintData(dt);
- }
- }
- catch (Exception ex)
- {
- Console.WriteLine("Exception: " + ex.Message);
- }
- }
- static void Main(string[] args)
- {
- string file = "..\\..\\myTest.xlsx";
- TestExcelWrite(file);
- TestExcelRead(file);
- }
- }
- }
复制代码
签于这篇文章阅读量较高,更新一下我使用Aspose.Cells的另一个版本:
PS:Aspose是要收费的
- using System;
- using System.Collections.Generic;
- using System.Data;
- using System.IO;
- using System.Linq;
- using System.Text;
- using Aspose.Cells;
- namespace NetUtilityLib
- {
- public static class ExcelHelper
- {
- public static int DataTableToExcel(DataTable data, string fileName, string sheetName, bool isColumnNameWritten)
- {
- int num = -1;
- try
- {
- Workbook workBook;
- Worksheet worksheet = null;
- if (File.Exists(fileName))
- workBook = new Workbook(fileName);
- else
- workBook = new Workbook();
- if (sheetName == null)
- {
- if (workBook.Worksheets.Count > 0)
- {
- worksheet = workBook.Worksheets[0];
- }
- else
- {
- sheetName = "Sheet1";
- workBook.Worksheets.RemoveAt(sheetName);
- worksheet = workBook.Worksheets.Add(sheetName);
- }
- }
- if (worksheet != null)
- {
- worksheet.Cells.Clear();
- num = worksheet.Cells.ImportDataTable(data, isColumnNameWritten, 0, 0, false);
- workBook.Save(fileName);
- }
- }
- catch (Exception ex)
- {
- Console.WriteLine(ex.Message);
- }
- return num;
- }
- public static void AddOneRowToExcel(DataRow dataRow, string fileName, string sheetName)
- {
- try
- {
- Workbook workBook;
- if (File.Exists(fileName))
- workBook = new Workbook(fileName);
- else
- workBook = new Workbook();
- Worksheet worksheet=null;
- if (sheetName == null)
- {
- worksheet = workBook.Worksheets[0];
- }
- else
- {
- worksheet = workBook.Worksheets[sheetName];
- }
- if (worksheet != null)
- {
- worksheet.Cells.ImportDataRow(dataRow, worksheet.Cells.MaxDataRow + 1,0);
- //worksheet.Cells.ImportArray(dataArray, worksheet.Cells.MaxDataRow+1, 0, false);
- workBook.Save(fileName);
- }
- }
- catch (Exception ex)
- {
- Console.WriteLine(ex.Message);
- }
- }
- public static DataTable ExcelToDataTable(string fileName, string sheetName, bool isFirstRowColumnName)
- {
- DataTable data = new DataTable();
- try
- {
- Workbook workbook = null;
- FileInfo fileInfo = new FileInfo(fileName);
- if (fileInfo.Extension.ToLower().Equals(".xlsx"))
- workbook = new Workbook(fileName, new LoadOptions(LoadFormat.Xlsx));
- else if (fileInfo.Extension.ToLower().Equals(".xls"))
- workbook = new Workbook(fileName, new LoadOptions(LoadFormat.Excel97To2003));
- if (workbook != null)
- {
- Worksheet worksheet = null;
- if (sheetName != null)
- {
- worksheet = workbook.Worksheets[sheetName];
- }
- else
- {
- worksheet = workbook.Worksheets[0];
- }
- if (worksheet != null)
- {
- data = worksheet.Cells.ExportDataTable(0, 0, worksheet.Cells.MaxRow+1, worksheet.Cells.MaxColumn+1,
- isFirstRowColumnName);
- return data;
- }
- }
- else
- {
- return data;
- }
- }
- catch (Exception ex)
- {
- Console.WriteLine(ex.Message);
- }
- return data;
- }
- }
- }
复制代码
Excel相关DLL下载:NPOI-Lib.rar
1.NPOI下载地址:http://npoi.codeplex.com/releases/view/38113
2.NPOI学习系列教程推荐:http://www.cnblogs.com/tonyqus/archive/2009/04/12/1434209.html
参考:
http://www.cnblogs.com/Erik_Xu/archive/2012/06/08/2541957.html
http://www.cnblogs.com/linzheng/archive/2010/12/20/1912137.html
http://www.cnblogs.com/knowledge ... /11/16/2772547.html
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