Accept

CommentRangeStart.Accept method

Accepts a visitor.

public override bool Accept(DocumentVisitor visitor)
ParameterTypeDescription
visitorDocumentVisitorThe visitor that will visit the node.

Return Value

false if the visitor requested the enumeration to stop.

Remarks

Calls VisitCommentRangeStart.

For more info see the Visitor design pattern.

Examples

Shows how print the contents of all comments and their comment ranges using a document visitor.

public void CreateCommentsAndPrintAllInfo()
{
    Document doc = new Document();

    Comment newComment = new Comment(doc)
    {
        Author = "VDeryushev",
        Initial = "VD",
        DateTime = DateTime.Now
    };

    newComment.SetText("Comment regarding text.");

    // Add text to the document, warp it in a comment range, and then add your comment.
    Paragraph para = doc.FirstSection.Body.FirstParagraph;
    para.AppendChild(new CommentRangeStart(doc, newComment.Id));
    para.AppendChild(new Run(doc, "Commented text."));
    para.AppendChild(new CommentRangeEnd(doc, newComment.Id));
    para.AppendChild(newComment); 

    // Add two replies to the comment.
    newComment.AddReply("John Doe", "JD", DateTime.Now, "New reply.");
    newComment.AddReply("John Doe", "JD", DateTime.Now, "Another reply.");

    PrintAllCommentInfo(doc.GetChildNodes(NodeType.Comment, true));
}

/// <summary>
/// Iterates over every top-level comment and prints its comment range, contents, and replies.
/// </summary>
private static void PrintAllCommentInfo(NodeCollection comments)
{
    CommentInfoPrinter commentVisitor = new CommentInfoPrinter();

    // Iterate over all top-level comments. Unlike reply-type comments, top-level comments have no ancestor.
    foreach (Comment comment in comments.Where(c => ((Comment)c).Ancestor == null))
    {
        // First, visit the start of the comment range.
        CommentRangeStart commentRangeStart = (CommentRangeStart)comment.PreviousSibling.PreviousSibling.PreviousSibling;
        commentRangeStart.Accept(commentVisitor);

        // Then, visit the comment, and any replies that it may have.
        comment.Accept(commentVisitor);
        // Visit only start of the comment.
        comment.AcceptStart(commentVisitor);
        // Visit only end of the comment.
        comment.AcceptEnd(commentVisitor);

        foreach (Comment reply in comment.Replies)
            reply.Accept(commentVisitor);

        // Finally, visit the end of the comment range, and then print the visitor's text contents.
        CommentRangeEnd commentRangeEnd = (CommentRangeEnd)comment.PreviousSibling;
        commentRangeEnd.Accept(commentVisitor);

        Console.WriteLine(commentVisitor.GetText());
    }
}

/// <summary>
/// Prints information and contents of all comments and comment ranges encountered in the document.
/// </summary>
public class CommentInfoPrinter : DocumentVisitor
{
    public CommentInfoPrinter()
    {
        mBuilder = new StringBuilder();
        mVisitorIsInsideComment = false;
    }

    /// <summary>
    /// Gets the plain text of the document that was accumulated by the visitor.
    /// </summary>
    public string GetText()
    {
        return mBuilder.ToString();
    }

    /// <summary>
    /// Called when a Run node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitRun(Run run)
    {
        if (mVisitorIsInsideComment) IndentAndAppendLine("[Run] \"" + run.Text + "\"");

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a CommentRangeStart node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitCommentRangeStart(CommentRangeStart commentRangeStart)
    {
        IndentAndAppendLine("[Comment range start] ID: " + commentRangeStart.Id);
        mDocTraversalDepth++;
        mVisitorIsInsideComment = true;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a CommentRangeEnd node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitCommentRangeEnd(CommentRangeEnd commentRangeEnd)
    {
        mDocTraversalDepth--;
        IndentAndAppendLine("[Comment range end] ID: " + commentRangeEnd.Id + "\n");
        mVisitorIsInsideComment = false;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Comment node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitCommentStart(Comment comment)
    {
        IndentAndAppendLine(
            $"[Comment start] For comment range ID {comment.Id}, By {comment.Author} on {comment.DateTime}");
        mDocTraversalDepth++;
        mVisitorIsInsideComment = true;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when the visiting of a Comment node is ended in the document.
    /// </summary>
    public override VisitorAction VisitCommentEnd(Comment comment)
    {
        mDocTraversalDepth--;
        IndentAndAppendLine("[Comment end]");
        mVisitorIsInsideComment = false;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Append a line to the StringBuilder and indent it depending on how deep the visitor is into the document tree.
    /// </summary>
    /// <param name="text"></param>
    private void IndentAndAppendLine(string text)
    {
        for (int i = 0; i < mDocTraversalDepth; i++)
        {
            mBuilder.Append("|  ");
        }

        mBuilder.AppendLine(text);
    }

    private bool mVisitorIsInsideComment;
    private int mDocTraversalDepth;
    private readonly StringBuilder mBuilder;
}

See Also

CommentRangeStart.NodeType