新版本的xlsx是使用新的存储格式，貌似是处理过的XML。

对于OpenXML我网上搜了一下，很多人没有介绍。所以我就这里推荐下，相信会成为信息系统开发的必备。

先写出个例子，会发现如此的简介：

复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Text;
using XFormular.config;
using System.IO;
using com.xtar.amfx;
using System.Runtime.Serialization.Formatters.Binary;
using System.Data;

namespace XFormular.test
{
class Class1
{
public void test()
{
DataTable table = new DataTable("1");
table.Columns.Add("2");
for (int i = 0; i < 10; i++)
{
DataRow row = table.NewRow();
row[0] = i;
table.Rows.Add(row);
}

List<DataTable> lsit = new List<DataTable>();
lsit.Add(table);

OpenXmlSDKExporter.Export(AppDomain.CurrentDomain.BaseDirectory + "\\excel.xlsx", lsit);
}
}
}

写出代码

复制代码 代码如下:
using System;
using System.IO;
using System.Windows.Forms;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
using DocumentFormat.OpenXml.Extensions;
using System.Collections.Generic;
using System.Data;
using System.Text.RegularExpressions;

namespace XFormular
{
class OpenXmlSDKExporter
{
private static string[] Level = {"A", "B", "C", "D", "E", "F", "G",
"H", "I", "G", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T",
"U", "V", "W", "X", "Y", "Z" };

public static List<DataTable> Import(string path)
{
List<DataTable> tables = new List<DataTable>();

if (path.EndsWith(ExcelHelper.POSTFIX_SVN))
return tables;

using (MemoryStream stream = SpreadsheetReader.StreamFromFile(path))
{
using (SpreadsheetDocument doc = SpreadsheetDocument.Open(stream, true))
{
foreach (Sheet sheet in doc.WorkbookPart.Workbook.Descendants<Sheet>())
{
DataTable table = new DataTable(sheet.Name.Value);

WorksheetPart worksheet = (WorksheetPart)doc.WorkbookPart.GetPartById(sheet.Id);

List<string> columnsNames = new List<string>();

foreach (Row row in worksheet.Worksheet.Descendants<Row>())
{
foreach (Cell cell in row)
{
string columnName = Regex.Match(cell.CellReference.Value, "[a-zA-Z]+").Value;

if (!columnsNames.Contains(columnName))
{
columnsNames.Add(columnName);
}

}
}

columnsNames.Sort(CompareColumn);

foreach (string columnName in columnsNames)
{
table.Columns.Add(columnName);
}

foreach (Row row in worksheet.Worksheet.Descendants<Row>())
{
DataRow tableRow = table.NewRow();
table.Rows.Add(tableRow);

foreach (Cell cell in row)
{
string columnName = Regex.Match(cell.CellReference.Value, "[a-zA-Z]+").Value;
tableRow[columnName] = GetValue(cell, doc.WorkbookPart.SharedStringTablePart);
}
}

if (table.Rows.Count <= 0)
continue;
if (table.Columns.Count <= 0)
continue;

tables.Add(table);
}
}
}

return tables;
}

public static String GetValue(Cell cell, SharedStringTablePart stringTablePart)
{

if (cell.ChildElements.Count == 0)

return null;

//get cell value

String value = cell.CellValue.InnerText;

//Look up real value from shared string table

if ((cell.DataType != null) && (cell.DataType == CellValues.SharedString))

value = stringTablePart.SharedStringTable

.ChildElements[Int32.Parse(value)]

.InnerText;

return value;

}

public static void Export(string path, List<DataTable> tables)
{
using (MemoryStream stream = SpreadsheetReader.Create())
{
using (SpreadsheetDocument doc = SpreadsheetDocument.Open(stream, true))
{
SpreadsheetWriter.RemoveWorksheet(doc, "Sheet1");
SpreadsheetWriter.RemoveWorksheet(doc, "Sheet2");
SpreadsheetWriter.RemoveWorksheet(doc, "Sheet3");

foreach (DataTable table in tables)
{
WorksheetPart sheet = SpreadsheetWriter.InsertWorksheet(doc, table.TableName);
WorksheetWriter writer = new WorksheetWriter(doc, sheet);

SpreadsheetStyle style = SpreadsheetStyle.GetDefault(doc);

foreach (DataRow row in table.Rows)
{
for (int i = 0; i < table.Columns.Count; i++)
{
string columnName = SpreadsheetReader.GetColumnName("A", i);
string location = columnName + (table.Rows.IndexOf(row) + 1);
writer.PasteText(location, row[i].ToString(), style);
}
}

writer.Save();
}
SpreadsheetWriter.StreamToFile(path, stream);//保存到文件中
}
}
}

private static int CompareColumn(string x, string y)
{
int xIndex = Letter_to_num(x);
int yIndex = Letter_to_num(y);
return xIndex.CompareTo(yIndex);
}

/// <summary>
/// 数字26进制，转换成字母，用递归算法
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
private static string Num_to_letter(int value)
{
//此处判断输入的是否是正确的数字，略（正在表达式判断）
int remainder = value % 26;
//remainder = (remainder == 0) ? 26 : remainder;
int front = (value - remainder) / 26;
if (front < 26)
{
return Level[front - 1] + Level[remainder];
}
else
{
return Num_to_letter(front) + Level[remainder];
}
//return "";
}

/// <summary>
/// 26进制字母转换成数字
/// </summary>
/// <param name="letter"></param>
/// <returns></returns>
private static int Letter_to_num(string str)
{
//此处判断是否是由A-Z字母组成的字符串，略（正在表达式片段）
char[] letter = str.ToCharArray(); //拆分字符串
int reNum = 0;
int power = 1; //用于次方算值
int times = 1; //最高位需要加1
int num = letter.Length;//得到字符串个数
//得到最后一个字母的尾数值
reNum += Char_num(letter[num - 1]);
//得到除最后一个字母的所以值,多于两位才执行这个函数
if (num >= 2)
{
for (int i = num - 1; i > 0; i--)
{
power = 1;//致1，用于下一次循环使用次方计算
for (int j = 0; j < i; j++) //幂，j次方，应该有函数
{
power *= 26;
}
reNum += (power * (Char_num(letter[num - i - 1]) + times)); //最高位需要加1，中间位数不需要加一
times = 0;
}
}
//Console.WriteLine(letter.Length);
return reNum;
}

/// <summary>
/// 输入字符得到相应的数字，这是最笨的方法，还可用ASIICK编码；
/// </summary>
/// <param name="ch"></param>
/// <returns></returns>
private static int Char_num(char ch)
{
switch (ch)
{
case 'A':
return 0;
case 'B':
return 1;
case 'C':
return 2;
case 'D':
return 3;
case 'E':
return 4;
case 'F':
return 5;
case 'G':
return 6;
case 'H':
return 7;
case 'I':
return 8;
case 'J':
return 9;
case 'K':
return 10;
case 'L':
return 11;
case 'M':
return 12;
case 'N':
return 13;
case 'O':
return 14;
case 'P':
return 15;
case 'Q':
return 16;
case 'R':
return 17;
case 'S':
return 18;
case 'T':
return 19;
case 'U':
return 20;
case 'V':
return 21;
case 'W':
return 22;
case 'X':
return 23;
case 'Y':
return 24;
case 'Z':
return 25;
}
return -1;
}
}
}

复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;

namespace xtar_biz_codegen
{
class ExcelHelper
{
public static string POSTFIX_97 = "XLS";

public static string POSTFIX_03 = "XLSX";
}
}