การรักษาความปลอดภัยเอกสาร Excel Sensitive ด้วย Aspose.Cells LowCode Spreadsheet Locker

public void ProtectExcelFile(string inputFile, string outputFile, string password)
{
    // Configure loading options
    LowCodeLoadOptions loadOptions = new LowCodeLoadOptions { InputFile = inputFile };
    
    // Configure saving options
    LowCodeSaveOptions saveOptions = new LowCodeSaveOptions {
        OutputFile = outputFile,
        SaveFormat = SaveFormat.Xlsx
    };
    
    // Apply file-level protection
    SpreadsheetLocker.Process(loadOptions, saveOptions, password, null);
}

public void ValidateFileProtection(string filePath)
{
    try
    {
        // Attempt to open the file with an incorrect password
        new Workbook(filePath, new LoadOptions { Password = "wrongpassword" });
        Console.WriteLine("Warning: File opened with incorrect password!");
    }
    catch (CellsException ex)
    {
        if (ex.Code == ExceptionType.IncorrectPassword)
            Console.WriteLine("Success: Incorrect password rejected.");
        else
            throw;
    }
}

public void ApplyMultiLayerProtection(string inputFile, string outputFile, string filePassword)
{
    // Configure loading options
    LowCodeLoadOptions loadOptions = new LowCodeLoadOptions { InputFile = inputFile };
    
    using (Workbook workbook = new Workbook(inputFile))
    {
        // Protect workbook structure
        workbook.Settings.WriteProtection.SetPassword("StructurePassword");
        
        // Protect worksheets
        foreach (Worksheet worksheet in workbook.Worksheets)
            worksheet.Protect(ProtectionType.All, "SheetPassword", true);
        
        // Save the intermediate workbook
        workbook.Save("intermediate.xlsx");
    }
    
    LowCodeSaveOptions saveOptions = new LowCodeSaveOptions {
        InputFile = "intermediate.xlsx",
        OutputFile = outputFile,
        SaveFormat = SaveFormat.Xlsx
    };
    
    // Apply file-level encryption
    SpreadsheetLocker.Process(loadOptions, saveOptions, filePassword, null);
    
    if (File.Exists("intermediate.xlsx"))
        File.Delete("intermediate.xlsx");
}

public void BatchProtectExcelFiles(string[] inputFiles, string outputDirectory, string password)
{
    if (!Directory.Exists(outputDirectory))
        Directory.CreateDirectory(outputDirectory);
    
    int totalFiles = inputFiles.Length;
    int processedFiles = 0;
    int successCount = 0;
    int failCount = 0;
    
    foreach (string inputFile in inputFiles)
    {
        try
        {
            string fileName = Path.GetFileName(inputFile);
            string outputPath = Path.Combine(outputDirectory, $"Protected_{fileName}");
            
            LowCodeLoadOptions loadOptions = new LowCodeLoadOptions { InputFile = inputFile };
            LowCodeSaveOptions saveOptions = new LowCodeSaveOptions {
                OutputFile = outputPath,
                SaveFormat = SaveFormat.Xlsx
            };
            
            SpreadsheetLocker.Process(loadOptions, saveOptions, password, null);
            successCount++;
            Console.WriteLine($"Protected {fileName} successfully");
        }
        catch (Exception ex)
        {
            failCount++;
            Console.WriteLine($"Failed to protect {Path.GetFileName(inputFile)}: {ex.Message}");
        }
        
        processedFiles++;
        double progressPercentage = (double)processedFiles / totalFiles * 100;
        Console.WriteLine($"Progress: {progressPercentage:F1}% ({processedFiles}/{totalFiles})
    }
    
    Console.WriteLine($"Batch protection complete. Success: {successCount}, Failed: {failCount}");
}