Render Macros in Umbraco UserControl

UmbracoMacroHelpers.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using System.Web.UI;
using umbraco;

namespace samandmoore
{
    public static class UmbracoMacroHelpers
    {
        public static string RenderMacros(string content, int pageId) {
            // load up the current "page" in umbraco speak, sort of like our umbraco request context
            var currentPage = new page(((System.Xml.IHasXmlNode)umbraco.library.GetXmlNodeById(pageId.ToString()).Current).GetNode());

            if (string.IsNullOrWhiteSpace(content))
                return string.Empty;

            // First parse for known umbraco tags
            // <?UMBRACO_MACRO/> - macros
            // <?UMBRACO_GETITEM/> - print item from page, level, or recursive
            var regex = new Regex("<\\?UMBRACO_MACRO[^>]*/>|<\\?UMBRACO_GETITEM[^>]*/>|<\\?(?<tagName>[\\S]*)[^>]*/>", RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
            return regex.Replace(content, tag => {
                try {
                    // parse the attributes from this tag
                    Hashtable attributes = helper.ReturnAttributes(tag.Value.ToString());

                    // if the tag is a macro, try to convert it into it's output string
                    if (tag.ToString().ToLower().IndexOf("umbraco_macro") > -1) {
                        string macroAlias = helper.FindAttribute(attributes, "macroalias");
                        if (!string.IsNullOrWhiteSpace(macroAlias)) {
                            return GetRenderedMacro(macroAlias, currentPage, attributes, pageId);
                        }
                    }

                    return tag.Value;

                } catch {
                    return tag.Value;
                }
            });
        }

        public static string GetRenderedMacro(string macroAlias, page umbPage, Hashtable attributes, int pageId) {
            var m = macro.ReturnFromAlias(macroAlias);
            Control c = m.renderMacro(attributes, umbPage.Elements, pageId);
            TextWriter writer = new StringWriter();
            var ht = new HtmlTextWriter(writer);
            c.RenderControl(ht);
            string result = writer.ToString();

            return result;
        }

        public static IEnumerable<macro> ParseMacros(string content) {
            // First parse for known umbraco tags
            // <?UMBRACO_MACRO/> - macros
            // <?UMBRACO_GETITEM/> - print item from page, level, or recursive
            MatchCollection tags = Regex.Matches(content, "<\\?UMBRACO_MACRO[^>]*/>|<\\?UMBRACO_GETITEM[^>]*/>|<\\?(?<tagName>[\\S]*)[^>]*/>", RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);

            foreach (Match tag in tags) {
                Hashtable attributes = helper.ReturnAttributes(tag.Value.ToString());

                if (tag.ToString().ToLower().IndexOf("umbraco_macro") > -1) {
                    String macroAlias = helper.FindAttribute(attributes, "macroalias");
                    if (!string.IsNullOrWhiteSpace(macroAlias)) {
                        yield return macro.ReturnFromAlias(macroAlias);
                    }
                }
            }
        }
    }
}