通过 C# 加密 XLSB 文件

// load the XLSB Excel file 
var book = new Aspose.Cells.Workbook("unlocked.xlsb");

// access the first worksheet
var worksheet = book.Worksheets[0];

// protect the worksheet with password
worksheet.Protect(Aspose.Cells.ProtectionType.All, "password", null);

// protect the whole workbook with password
book.Protect(Aspose.Cells.ProtectionType.All, "password");

// save the modified file in default format
book.Save("protected.xlsb");