在更改内部文本之前检测 word 文档是否受密码保护

Question

我正在编写一个方法，该方法将进入一个目录，查找所有 doc 文件并替换其中的特定文本。因此，我的方法接受三个参数。

1. 目录路径
2. 我要替换的字符串
3. 新的替换字符串

我面临的问题是当我点击受密码保护的文档时。在打开文档之前，我无法检查文档是否受到保护。在这种情况下，每次我检查文档时，我都会收到一个对话框字窗口询问密码。我想检查文档是否受到保护，如果它只是继续使用 foreach。

这是我的代码：

private static void ReplaceString(string folderPath, string findText, string replaceText)
{
    // retrieve all doc files from the specified directory
    var wordFiles = Directory.GetFiles(folderPath, "*.doc", SearchOption.AllDirectories);
    var filtered = wordFiles.Where(f => !f.Contains('$'));
    foreach (var wordFilePath in filtered)
    {
        Console.WriteLine(wordFilePath);
        // start a new word application
        FileInfo fi = new FileInfo(wordFilePath);
        //  var wordDocument = new Document();
        //checking the current element if: is in use, is readonly, if is protected by password
        if (IsLocked(fi))
        {
            continue;
        }
        var wordApplication = new Application { Visible = false };

        //opening the word document
        Document wordDocument = null;
// I want to catch here if the document is protected just to contonie forward
        try
        {
            wordDocument = wordApplication.Documents.Open(wordFilePath, ReadOnly: false, ConfirmConversions: false);
        }
        catch (COMException e)
        {
            continue;
        }
        //Unfolding all fields in a document using ALT + F9
        wordDocument.ActiveWindow.View.ShowFieldCodes = true;

        // using range class to populate a list of all document members
        var range = wordDocument.Range();

        try
        {
            range.Find.Execute(FindText: findText, Replace: WdReplace.wdReplaceAll, ReplaceWith: replaceText);
        }
        catch (COMException e)
        {
            continue;
        }
        // replace searched text
        var shapes = wordDocument.Shapes;
        foreach (Shape shape in shapes)
        {
            var initialText = shape.TextFrame.TextRange.Text;
            var resultingText = initialText.Replace(findText, replaceText);
            shape.TextFrame.TextRange.Text = resultingText;
        }

        // Show original fields without code 
        wordDocument.ActiveWindow.View.ShowFieldCodes = false;

        // save and close the current document
        wordDocument.Save();
        wordDocument.Close();
        wordApplication.NormalTemplate.Saved = true;
        wordApplication.Quit();

        // Release this document from memory.
        Marshal.ReleaseComObject(wordApplication);
    }
}

Answer 1

Documents.Open() 方法有一个PasswordDocument 参数。如果您将其分配给随机密码（错误密码），如果文档没有密码保护，该方法将忽略您分配的密码。如果文档受密码保护，该方法将抛出 5408 异常，您可以捕获该异常。

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