NPOI用WorkbookFactory读写 2007以上格式文件(xlsx)

Posted 2020-09-22 dejex

//我用的最新的2.2.1版本

//第一步：引用DLL，5个全导入，包括ICSHARP.ZIP,是个开源压缩工具包。XLSX是压缩格式，需要它来解压

//第二部：

using NPOI.SS.UserModel;

//够了

//第三部：用IWorkbook 接口，+WorkbookFactory类

//第四步：读取xlsx文件内容

StringBuilder sb = new StringBuilder();
using (FileStream fs = new FileStream(@"D:\temp\temp.xlsx", FileMode.Open, FileAccess.Read))
{
IWorkbook sswb = WorkbookFactory.Create(fs);
for(int i=0;i<sswb.NumberOfSheets;i++)
{
sb.Append("\r\n\r\n"+sswb.GetSheetName(i)+"\r\n");

ISheet sh = sswb.GetSheetAt(i);
for (int j = 0; j < sh.LastRowNum; j++)
{
IRow row = sh.GetRow(j);//读取当前行
if(row!=null)
{
sb.Append("\r\n----------------line"+j.ToString()+"--------------------------\r\n");
for (int k = 0; k < row.LastCellNum; k++)
{
ICell cell = row.GetCell(k);
if(cell!=null)
{
sb.Append(cell.ToString()+"|");
}
}
}
}
}
}
textBox1.Text = sb.ToString();

//第五步：写入xlsx文件

string file = @"D:\temp\test.xlsx";
IWorkbook wb = null;
using (FileStream fs = File.Open(file, FileMode.Open, FileAccess.Read,FileShare.Read))
{
wb = WorkbookFactory.Create(fs);
fs.Close();
}
ISheet sh = wb.GetSheetAt(0);
IRow row = sh.CreateRow(8);
ICell cell = row.CreateCell(0);
cell.SetCellValue(1);
using (FileStream fs = File.Open(file, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
wb.Write(fs);
fs.Close();
}
System.Diagnostics.Process.Start(Path.GetFullPath(file));

//对不起大家，我撒谎了，NPOI不支持XLSX文件输出。

//不会有错误提示，但生成的文件打开会“发现不可读取内容, xxxOOO..."