_MailAutoSig书签缺失(Outlook 2010)

不久前，我为Outlook编写了一个插件，该插件在Outlook消息中的签名下方添加/删除了可选的标语。 此加载项工作没有问题。

我正在编写第二个加载项，该加载项可能需要在该加载项下方添加信息（无论是否存在可选签名），并再次从 Word 编辑器引用_MailAutoSig书签。 我遇到的问题是此书签似乎不再出现，其他加载项的书签也不再出现。

下面两段代码的一个区别是，第一段代码的 MailItem 是从 ItemSend 传递的对象转换而来的，而第二段代码是在 ItemSend 事件之前处理的。

这是我目前正在编写的代码：

            Word.Document toMsg = msg.GetInspector.WordEditor as Word.Document;
        foreach (Word.Bookmark b in toMsg.Bookmarks)
            Debug.Print(b.ToString());
        Word.Range r_toMsg;
        try
        {
            string oBookmark = "_MailAutoSig";  // Outlook internal bookmark for location of the e-mail signature`
            object oBookmarkObj = oBookmark;
            if (toMsg.Bookmarks.Exists(oBookmark) == true)
                Debug.Print("sigbookmark");
            r_toMsg = toMsg.Bookmarks.get_Item(ref oBookmarkObj).Range;
        }
        catch
        {
            string oOffsiteBookmark = "OffsiteBookmark";
            object oOffsiteBookmarkObj = oOffsiteBookmark;
            if (toMsg.Bookmarks.Exists(oOffsiteBookmark) == true)  // if the custom bookmark exists, remove it
                Debug.Print("offsite bookmark");
        }
        finally
        { 
            r_toMsg = toMsg.Range(missing,missing);
        }

这是我的工作加载项中的代码：

void InsertOffsiteSig(Outlook.MailItem oMsg)
{
    object oBookmarkName = "_MailAutoSig";  // Outlook internal bookmark for location of the e-mail signature
    string oOffsiteBookmark = "OffsiteBookmark";  // bookmark to be created in Outlook for the Offsite tagline
    object oOffsiteBookmarkObj = oOffsiteBookmark;
    Word.Document SigDoc = oMsg.GetInspector.WordEditor as Word.Document; // edit the message using Word
    string bf = oMsg.BodyFormat.ToString();  // determine the message body format (text, html, rtf)
    //  Go to the e-mail signature bookmark, then set the cursor to the very end of the range.
    //  This is where we will insert/remove our tagline, and the start of the new range of text
    Word.Range r = SigDoc.Bookmarks.get_Item(ref oBookmarkName).Range;
    object collapseEnd = Word.WdCollapseDirection.wdCollapseEnd;
    r.Collapse(ref collapseEnd);
    string[] taglines = GetRssItem();  // Get tagline information from the RSS XML file and place into an array

    // Loop through the array and insert each line of text separated by a newline
    foreach (string taglineText in taglines)
        r.InsertAfter(taglineText + "'n");
    r.InsertAfter("'n");
    // Add formatting to HTML/RTF messages
    if (bf != "olFormatPlain" && bf != "olFormatUnspecified")
    {
        SigDoc.Hyperlinks.Add(r, taglines[2]); // turn the link text into a hyperlink
        r.Font.Underline = 0;  // remove the hyperlink underline
        r.Font.Color = Word.WdColor.wdColorGray45;  // change all text to Gray45
        r.Font.Size = 8;  // Change the font size to 8 point
        r.Font.Name = "Arial";  // Change the font to Arial
    }
    r.NoProofing = -1;  // turn off spelling/grammar check for this range of text
    object range1 = r;
    SigDoc.Bookmarks.Add(oOffsiteBookmark, ref range1);  // define this range as our custom bookmark

    if (bf != "olFormatPlain" && bf != "olFormatUnspecified")
    {
        // Make the first line BOLD only for HTML/RTF messages
        Word.Find f = r.Find;
        f.Text = taglines[0];
        f.MatchWholeWord = true;
        f.Execute();
        while (f.Found)
        {
            r.Font.Bold = -1;
            f.Execute();
        }
    }
    else
    {
        // otherwise turn the plain text hyperlink into an active hyperlink
        // this is done here instead of above due to the extra formatting needed for HTML/RTF text
        Word.Find f = r.Find;

        f.Text = taglines[2];
            f.MatchWholeWord = true;
            f.Execute();
            SigDoc.Hyperlinks.Add(r, taglines[2]);
        }
        r.NoProofing = -1;  // disable spelling/grammar checking on the updated range
        r.Collapse(collapseEnd);
}