C# Named token replacement as an alternative to the numerical tokens of String.Format - yet another attempt at performance

Haacked.StringLib.ZausFormatter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

/// via original discussion http://haacked.com/archive/2009/01/14/named-formats-redux.aspx
namespace Haacked.StringLib {

	/// <summary>
	/// Extension string methods for named token replacement
	/// </summary>
	public static class ZausFormatter {

		/// <summary>
		/// Turn a token into a token-mask
		/// </summary>
		/// <param name="token">the token</param>
		/// <returns></returns>
		private static string Tokenize(object token) {
			return string.Format("{{{0}}}", token);
		}

		/// <summary>
		/// Given a duplicating list of tokens, repeat and effect named replacements
		/// </summary>
		/// <param name="mask">the named token list</param>
		/// <param name="tokens">the list of tokens, given as (key, value) subsequent pairs.  Expects the "key" to be a string.</param>
		/// <returns></returns>
		public static string ZausFormat(this string mask, params object[] tokens) {
			var result = new StringBuilder(mask);
			for (int i = tokens.Length - 1; i > 0; i -= 2) {
				result.Replace(Tokenize(tokens[i - 1]), tokens[i].ToString());
			}
			return result.ToString();
		}

		#region ------------------ fancy-shmancy anonymous object source --------------------------

		/// <summary>
		/// Turn an anonymous object into a Dictionary; internally similar to <see cref="System.Web.Mvc.HtmlHelper.AnonymousObjectToHtmlAttributes"/>
		/// </summary>
		/// <remarks>http://aspnetwebstack.codeplex.com/SourceControl/changeset/view/5ac8586b78b3#src%2fSystem.Web.Mvc%2fHtmlHelper.cs</remarks>
		/// <param name="collection">the anonymous collection of property-values</param>
		/// <returns>A typecast dictionary from the object</returns>
		private static IDictionary<string, Tvalue> AnonymousObjectToDictionary<Tvalue>(object collection) {
			var result = new Dictionary<string, Tvalue>();

			if (collection != null) {
				foreach (System.ComponentModel.PropertyDescriptor property in System.ComponentModel.TypeDescriptor.GetProperties(collection)) {
					result.Add(property.Name,/*  (typeof(Tvalue).IsValueType ?  */(Tvalue)(property.GetValue(collection)));
				}
			}

			return result;
		}

		/// <summary>
		/// Given a duplicating list of tokens, repeat and effect named replacements
		/// </summary>
		/// <param name="mask">the named token list</param>
		/// <param name="tokens">the list of tokens, given as (key, value) subsequent pairs.  Expects the "key" to be a string.</param>
		/// <returns></returns>
		public static string ZausFormatObject(this string mask, object tokenList) {
			var tokens = AnonymousObjectToDictionary<object>(tokenList);
			var result = new StringBuilder(mask);
			foreach (var token in tokens) {
				result.Replace(Tokenize(token.Key), token.Value.ToString());
			}

			return result.ToString();
		}

		#endregion ------------------ fancy-shmancy anonymous object source --------------------------


	}
}