Я могу создать транзакцию отмены в Word или Excel? (VSTO)

Excel имеет некоторую (ограниченную) встроенную поддержку отмены и восстановления как часть его архитектуры VBA.

Я не знаком с vsto, таким образом, я не знаю, выручит ли это Вас, но можно смотреть на это ТАК вопрос для получения дополнительной информации.

Я долго пережевывал это. Вот моя попытка использовать скрытый документ, а затем захватить WordOpenXML из скрытого документа и поместить его в настоящий документ, когда это необходимо для выполнения любого количества действий VSTO за одну отмену.

//Usage from ThisDocument VSTO Document level project
public partial class ThisDocument
{   
    //Used to buffer writing text & formatting to document (to save undo stack)
    public static DocBuffer buffer;

    //Attached Template
    public static Word.Template template;

    private void ThisDocument_Startup(object sender, System.EventArgs e)
    {           
        //Ignore changes to template (removes prompt to save changes to template)
        template = (Word.Template)this.Application.ActiveDocument.get_AttachedTemplate();
        template.Saved = true;            

        //Document buffer
        buffer = new DocBuffer();

        //Start buffer
        ThisDocument.buffer.Start();

        //This becomes one "undo"
        Word.Selection curSel = Globals.ThisDocument.Application.Selection;
        curSel.TypeText(" ");
        curSel.TypeBackspace();
        curSel.Font.Bold = 1;
        curSel.TypeText("Hello, world!");
        curSel.Font.Bold = 0;
        curSel.TypeText(" ");

        //end buffer, print out text
        ThisDocument.buffer.End();
    }

    void Application_DocumentBeforeClose(Microsoft.Office.Interop.Word.Document Doc, ref bool Cancel)
    {
        buffer.Close();
    }

    private void ThisDocument_Shutdown(object sender, System.EventArgs e)
    {
        buffer.Close();         
    }
}

Вот класс DocBuffer:

public class DocBuffer
{
    //Word API Objects
    Word._Document HiddenDoc;
    Word.Selection curSel;
    Word.Template template;

    //ref parameters
    object missing = System.Type.Missing;
    object FalseObj = false; //flip this for docbuffer troubleshooting
    object templateObj;

    //Is docbuffer running?
    public Boolean started{ get; private set; }

    //Open document on new object
    public DocBuffer()
    {
        //Clear out unused buffer bookmarks
        Word.Bookmarks bookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks;
        bookmarks.ShowHidden = true;

        foreach (Word.Bookmark mark in bookmarks)
        {
            if (mark.Name.Contains("_buf"))
            {
                mark.Delete();
            }
        }

        //Remove trail of undo's for clearing out the bookmarks
        Globals.ThisDocument.UndoClear();

        //Set up template
        template = ThisDocument.template;
        templateObj = template;

        //Open Blank document, then attach styles *and update
        HiddenDoc = Globals.ThisDocument.Application.Documents.Add(ref missing, ref missing, ref missing, ref FalseObj);
        HiddenDoc.set_AttachedTemplate(ref templateObj);
        HiddenDoc.UpdateStyles();

        //Tell hidden document it has been saved to remove rare prompt to save document
        HiddenDoc.Saved = true;

        //Make primary document active
        Globals.ThisDocument.Activate();

    }

    ~DocBuffer()
    {
        try
        {
            HiddenDoc.Close(ref FalseObj, ref missing, ref missing);
        }
        catch { }
    }

    public void Close()
    {
        try
        {
            HiddenDoc.Close(ref FalseObj, ref missing, ref missing);
        }
        catch { }
    }

    public void Start()
    {
        try
        {
            //Make hidden document active to receive selection
            HiddenDoc.Activate(); //results in a slight application focus loss
        }
        catch (System.Runtime.InteropServices.COMException ex)
        {
            if (ex.Message == "Object has been deleted.")
            {
                //Open Blank document, then attach styles *and update
                HiddenDoc = Globals.ThisDocument.Application.Documents.Add(ref missing, ref missing, ref missing, ref FalseObj);
                HiddenDoc.set_AttachedTemplate(ref templateObj);
                HiddenDoc.UpdateStyles();
                HiddenDoc.Activate();
            }
            else
                throw;
        }

        //Remove Continue Bookmark, if exists
        Word.Bookmarks hiddenDocBookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks;
        if (hiddenDocBookmarks.Exists("Continue"))
        {
            object deleteMarkObj = "Continue";
            Word.Bookmark deleteMark = hiddenDocBookmarks.get_Item(ref deleteMarkObj);
            deleteMark.Select();
            deleteMark.Delete();
        }

        //Tell hidden document it has been saved to remove rare prompt to save document
        HiddenDoc.Saved = true;

        //Keep track when started
        started = true;
    }

    //Used for non-modal dialogs to bring active document back up between text insertion
    public void Continue()
    {
        //Exit quietly if buffer hasn't started
        if (!started) return;

        //Verify hidden document is active
        if ((HiddenDoc as Word.Document) != Globals.ThisDocument.Application.ActiveDocument)
        {
            HiddenDoc.Activate();
        }

        //Hidden doc selection
        curSel = Globals.ThisDocument.Application.Selection;

        //Hidden doc range
        Word.Range bufDocRange;

        //Select entire doc, save range
        curSel.WholeStory();
        bufDocRange = curSel.Range;

        //Find end, put a bookmark there
        bufDocRange.SetRange(curSel.End, curSel.End);
        object bookmarkObj = bufDocRange;

        //Generate "Continue" hidden bookmark
        Word.Bookmark mark = Globals.ThisDocument.Application.ActiveDocument.Bookmarks.Add("Continue", ref bookmarkObj);
        mark.Select();

        //Tell hidden document it has been saved to remove rare prompt to save document
        HiddenDoc.Saved = true;

        //Make primary document active
        Globals.ThisDocument.Activate();
    }

    public void End()
    {
        //Exit quietly if buffer hasn't started
        if (!started) return;

        //Turn off buffer started flag
        started = false;

        //Verify hidden document is active
        if ((HiddenDoc as Word.Document) != Globals.ThisDocument.Application.ActiveDocument)
        {
            HiddenDoc.Activate();
        }

        //Remove Continue Bookmark, if exists
        Word.Bookmarks hiddenDocBookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks;
        hiddenDocBookmarks.ShowHidden = true;
        if (hiddenDocBookmarks.Exists("Continue"))
        {
            object deleteMarkObj = "Continue";
            Word.Bookmark deleteMark = hiddenDocBookmarks.get_Item(ref deleteMarkObj);
            deleteMark.Delete();
        }

        //Hidden doc selection
        curSel = Globals.ThisDocument.Application.Selection;

        //Hidden doc range
        Word.Range hiddenDocRange;
        Word.Range bufDocRange;

        //Select entire doc, save range
        curSel.WholeStory();
        bufDocRange = curSel.Range;

        //If cursor bookmark placed in, move there, else find end of text, put a bookmark there
        Boolean cursorFound = false;
        if (hiddenDocBookmarks.Exists("_cursor"))
        {
            object cursorBookmarkObj = "_cursor";
            Word.Bookmark cursorBookmark = hiddenDocBookmarks.get_Item(ref cursorBookmarkObj);
            bufDocRange.SetRange(cursorBookmark.Range.End, cursorBookmark.Range.End);
            cursorBookmark.Delete();
            cursorFound = true;
        }
        else
        {
            //The -2 is done because [range object].WordOpenXML likes to drop bookmarks at the end of the range
            bufDocRange.SetRange(curSel.End - 2, curSel.End - 2);
        }

        object bookmarkObj = bufDocRange;

        //Generate GUID for hidden bookmark
        System.Guid guid = System.Guid.NewGuid();
        String id = "_buf" + guid.ToString().Replace("-", string.Empty);
        Word.Bookmark mark = Globals.ThisDocument.Application.ActiveDocument.Bookmarks.Add(id, ref bookmarkObj);

        //Get OpenXML Text (Text with formatting)
        curSel.WholeStory();
        hiddenDocRange = curSel.Range;
        string XMLText = hiddenDocRange.WordOpenXML;

        //Clear out contents of buffer
        hiddenDocRange.Delete(ref missing, ref missing); //comment this for docbuffer troubleshooting

        //Tell hidden document it has been saved to remove rare prompt to save document
        HiddenDoc.Saved = true;

        //Make primary document active
        Globals.ThisDocument.Activate();

        //Get selection from new active document
        curSel = Globals.ThisDocument.Application.Selection;

        //insert buffered formatted text into main document
        curSel.InsertXML(XMLText, ref missing);

        //Place cursor at bookmark+1 (this is done due to WordOpenXML ignoring bookmarks at the end of the selection)
        Word.Bookmarks bookmarks = Globals.ThisDocument.Application.ActiveDocument.Bookmarks;
        bookmarks.ShowHidden = true;

        object stringObj = id;
        Word.Bookmark get_mark = bookmarks.get_Item(ref stringObj);
        bufDocRange = get_mark.Range;

        if (cursorFound) //Canned language actively placed cursor
            bufDocRange.SetRange(get_mark.Range.End, get_mark.Range.End);
        else //default cursor at the end of text
            bufDocRange.SetRange(get_mark.Range.End + 1, get_mark.Range.End + 1);
        bufDocRange.Select();
}