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Block.AsEnumerable()

Provides an easy solution to visit every node of the parsed markdown document and perform simple modifications.

// parse markdown into document structure
var document = CommonMarkConverter.Parse("[click this link](~/hello)");

// walk the document node tree
foreach (var node in document.AsEnumerable())
{
    if (
        // start and end of each node may be visited separately
        node.IsOpening
        // blocks are elemets like paragraphs and lists, inlines are
        // elements like emphasis, links, images.
        && node.Inline != null 
        && node.Inline.Tag == InlineTag.Link)
    {
        if (node.Inline.TargetUrl.StartsWith("~"))
            node.Inline.TargetUrl = "http://server/app/" +
                node.Inline.TargetUrl.Substring(1);
    }
}

using (var writer = new System.IO.StringWriter())
{
    // write the HTML output
    CommonMarkConverter.ProcessStage3(document, writer);
    Console.WriteLine(writer.ToString());
}