OpenXml获取被保护Sheet的密码并解除保护

最新推荐文章于 2024-10-19 10:56:43 发布

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本文提供了一个使用C#解锁Excel工作表保护的示例代码，展示了如何读取和移除SheetProtection元素来解除工作表的密码保护。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DocumentFormat.OpenXml.Spreadsheet;
using com.mksword.Net.OpenXmlTools;
using com.mksword.OpenXmlUtil_log4netTool;
using DocumentFormat.OpenXml.Packaging;

namespace ConsoleApplication5
{
    class Class1 : ExcelTool
    {
        public override void Action()
        {
            if (_Core.HandOpenSpreadsheetDocumentOnLoacl(UnProtectCell, true))
            {
                SetLog("UnProcted", OXULogType.INFO);
            }
            else
            {
                SetLog("Operation Failed", OXULogType.FATAL);
            }
        }

        private bool UnProtectCell(SpreadsheetDocument SSD)
        {
            bool result = false;
            WorkbookPart WBP = SSD.WorkbookPart;
            Workbook WB = WBP.Workbook;
            Sheet S = WB.Descendants<Sheet>().Where(SH => SH.Name == "Sheet1")
                .FirstOrDefault();
            if (S != null)
            {
                WorksheetPart WSP = WBP.GetPartById(S.Id) as WorksheetPart;
                Worksheet WS = WSP.Worksheet;
                SheetProtection SP = WS.Descendants<SheetProtection>()
                    .FirstOrDefault();
                if (SP != null)
                {
                    SetLog(SP.Password.Value, OXULogType.FATAL);
                    SP.Remove();
                    WS.Save();
                    result = true;

                }
                else
                    SetLog("SheetProtection in NULL", OXULogType.FATAL);
            }
            else
                SetLog("Sheet is NULL", OXULogType.FATAL);
            return result;
        }

        public String GetSheetPassword(String password)
        {
            Int32 pLength = password.Length;
            Int32 hash = 0;
            if (pLength == 0) return hash.ToString("X");

            for (Int32 i = pLength - 1; i >= 0; i--)
            {
                hash = hash >> 14 & 0x01 | hash << 1 & 0x7fff;
                hash ^= password[i];
            }
            hash = hash >> 14 & 0x01 | hash << 1 & 0x7fff;
            hash ^= 0x8000 | 'N' << 8 | 'K';
            hash ^= pLength;
            return hash.ToString("X");
        }
    }
}