How can I create a more user-friendly string.format syntax?

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How about the following, which works both for anonymous types (the example below), or regular types (domain entities, etc):

static void Main()
{
    string s = Format("You are {age} years old and your last name is {name} ",
        new {age = 18, name = "Foo"});
}

using:

static readonly Regex rePattern = new Regex(
    @"(\{+)([^\}]+)(\}+)", RegexOptions.Compiled);
static string Format(string pattern, object template)
{
    if (template == null) throw new ArgumentNullException();
    Type type = template.GetType();
    var cache = new Dictionary<string, string>();
    return rePattern.Replace(pattern, match =>
    {
        int lCount = match.Groups[1].Value.Length,
            rCount = match.Groups[3].Value.Length;
        if ((lCount % 2) != (rCount % 2)) throw new InvalidOperationException("Unbalanced braces");
        string lBrace = lCount == 1 ? "" : new string('{', lCount / 2),
            rBrace = rCount == 1 ? "" : new string('}', rCount / 2);

        string key = match.Groups[2].Value, value;
        if(lCount % 2 == 0) {
            value = key;
        } else {
            if (!cache.TryGetValue(key, out value))
            {
                var prop = type.GetProperty(key);
                if (prop == null)
                {
                    throw new ArgumentException("Not found: " + key, "pattern");
                }
                value = Convert.ToString(prop.GetValue(template, null));
                cache.Add(key, value);
            }
        }
        return lBrace + value + rBrace;
    });
}

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