如何使用 Open XML 密碼保護 Excel 文檔

Question

目前，我正在通過傳遞MemoryStream參數使用 Open XML 的SpreadsheetDocument類創建一個新的 Excel 文檔。 我現在需要在這個SpreadsheetDocument對象上設置密碼，但我嘗試的似乎不起作用。 無需輸入密碼即可打開 Excel 文檔。 以下是我到目前為止所嘗試的（ mem是MemoryStream參數）：

using (SpreadsheetDocument spreadsheet = SpreadsheetDocument.Open(mem, true))
{
    foreach (var sheet in spreadsheet.WorkbookPart.WorksheetParts)
    {
        sheet.Worksheet.Append(new SheetProtection() { Password = "test" });
    }
}

我也嘗試了以下但沒有成功：

using (SpreadsheetDocument spreadsheet = SpreadsheetDocument.Open(mem, true))
{
    spreadsheet.WorkbookPart.Workbook.WorkbookProtection = new WorkbookProtection
    {
        LockStructure = true,
        LockWindows = true,
        WorkbookPassword = "test"
    }
}

請問我錯過了什么？

Answer 1

Openxml 表保護密碼的輸入數據類型為“HexBinaryValue”。 所以輸入密碼要從字符串轉換為十六進制二進制。

foreach (var worksheetPart in spreadsheet.WorkbookPart.WorksheetParts)
     {
         //Call the method to convert the Password string "MyPasswordfor sheet" to hexbinary type
         string hexConvertedPassword =  HexPasswordConversion("MyPasswordfor sheet");
//passing the Converted password to sheet protection
          SheetProtection sheetProt = new SheetProtection() { Sheet = true, Objects = true, Scenarios = true, Password = hexConvertedPassword };
          worksheetPart.Worksheet.InsertAfter(sheetProt,worksheetPart.Worksheet.Descendants<SheetData>().LastOrDefault());
worksheetPart.Worksheet.Save();
     }


/* This method will convert the string password to hexabinary value */
 protected string HexPasswordConversion(string password)
        {
            byte[] passwordCharacters = System.Text.Encoding.ASCII.GetBytes(password);
            int hash = 0;
            if (passwordCharacters.Length > 0)
            {
                int charIndex = passwordCharacters.Length;

                while (charIndex-- > 0)
                {
                    hash = ((hash >> 14) & 0x01) | ((hash << 1) & 0x7fff);
                    hash ^= passwordCharacters[charIndex];
                }
                // Main difference from spec, also hash with charcount
                hash = ((hash >> 14) & 0x01) | ((hash << 1) & 0x7fff);
                hash ^= passwordCharacters.Length;
                hash ^= (0x8000 | ('N' << 8) | 'K');
            }

            return Convert.ToString(hash, 16).ToUpperInvariant();
        }

Answer 2

好吧，這不完全是我想要做的，但我最終放棄了 Open XML SDK 並使用 Office.Interop 程序集來保護文檔。 首先使用 Open XML 的原因是因為似乎無法使用流打開 Interop 工作簿，它需要一個實際文件。

Answer 3

你可以試試這個：

using (SpreadsheetDocument spreadsheet = SpreadsheetDocument.Open(mem, true))
{
     foreach (var worksheetPart in spreadsheet.WorkbookPart.WorksheetParts)
     {
          SheetProtection sheetProt = new SheetProtection() { Sheet = true, Objects = true, Scenarios = true, Password = "test" };
          worksheetPart.Worksheet.InsertAfter(sheetProt, worksheetPart.Worksheet.Descendants<SheetData>().LastOrDefault());
     }
}

Answer 4

禁止在超級圖書館（Libre）中使用坦帕拉姆語（OfficeOpenXml）禁止在任何情況下都可以使用永久性文件保護合同。 OpenXML的獨創性和檔案管理的差異性，反之亦然。

OfficeOpenXml的pequeñoproyecto產品

using OfficeOpenXml;
using System.IO;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a new ExcelPackage
            using (ExcelPackage excelPackage = new ExcelPackage())
            {
                //Set some properties of the Excel document
                excelPackage.Workbook.Properties.Author = "VDWWD";
                excelPackage.Workbook.Properties.Title = "Title of Document";
                excelPackage.Workbook.Properties.Subject = "EPPlus demo export data";


                //Create the WorkSheet
                ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

                //Add some text to cell A1
                worksheet.Cells["A1"].Value = "My first EPPlus spreadsheet!";
                //You could also use [line, column] notation:
                worksheet.Cells[1, 2].Value = "This is cell B1!";

                //Save your file
                FileInfo fi = new FileInfo(@"D:\PruebasXMLS\File.xlsx");
                excelPackage.SaveAs(fi, "123456789");
            }
        }
    }
}

參考： https : //riptutorial.com/epplus