XSSFWorkbook write issue

[KoakiMiku]

NPOI Version

2.7.1

File Type

• XLSX
• XLS
• DOCX
• XLSM
• OTHER

Issue Description

I have a template excel file, when I use the following code and write to a new excel file, both "1.xlsx" and "2.xlsx" are modified.
Is this behavior correct?

var templateFile = "./1.xlsx";
var newFile = "./2.xlsx";

using var workbook = new XSSFWorkbook(templateFile);
var sheet = workbook.GetSheetAt(0);
var baseCell = sheet.GetRow(1).GetCell(0);
var cell = sheet.CreateRow(2).CreateCell(0);
cell.SetCellValue("Test");
cell.CellStyle = baseCell.CellStyle;

using var fileStream = new FileStream(newFile, FileMode.OpenOrCreate);
workbook.Write(fileStream, false);

Now I am using the following code to avoid this issue.

var templateFile = "./1.xlsx";
var newFile = "./2.xlsx";

File.Copy(templateFile, newFile, true);
using var workbook = new XSSFWorkbook(newFile);
var sheet = workbook.GetSheetAt(0);
var baseCell = sheet.GetRow(1).GetCell(0);
var cell = sheet.CreateRow(2).CreateCell(0);
cell.SetCellValue("Test");
cell.CellStyle = baseCell.CellStyle;

workbook.Write(Stream.Null, false);

[wuzxc1230123]

` public XSSFWorkbook(FileInfo file, bool readOnly = false)
: this(OPCPackage.Open(file, readOnly? PackageAccess.READ: PackageAccess.READ_WRITE))
{

}`

XSSFWorkbook READ_WRITE

[wuzxc1230123]

`
public XSSFWorkbook(FileInfo file, bool readOnly = false)
: this(OPCPackage.Open(file, readOnly? PackageAccess.READ: PackageAccess.READ_WRITE))
{

}
`

templateFile create set

` public XSSFWorkbook(FileInfo file, bool readOnly = false)
: this(OPCPackage.Open(file, readOnly? PackageAccess.READ: PackageAccess.READ_WRITE))
{

}`

XSSFWorkbook new set readOnly