Mvc Helpers – HtmlAttributes Extension

Just a quick not on how to pass and render HtmlAttributes in a helper:

public HtmlString Add(YourObject yourObject, object htmlAttributes = null)
{
    var attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
    //process you markup etc.
    attributes.ToHtmlAttributes()
}
public static class RouteValueDictionaryExtensions
{
    public static IHtmlString ToHtmlAttributes(this RouteValueDictionary dictionary)
    {
        var sb = new StringBuilder();
        foreach (var kvp in dictionary)
        {
            sb.Append(string.Format("{0}=\"{1}\" ", kvp.Key, kvp.Value));
        }
        return new HtmlString(sb.ToString());
    }
    public static void ToHtmlAttributes(this RouteValueDictionary dictionary, StringBuilder sb)
    {
        foreach (var kvp in dictionary)
        {
            sb.Append(string.Format("{0}=\"{1}\" ", kvp.Key, kvp.Value));
        }
    }
}