ToSelectListItems MVC Html Utility

using System;
using System.Collections.Generic;
using System.Web.Mvc;

namespace SingleWebPOC.Util
{
    public static class HtmlUtil
    {
        /*
         Examples using System.TimeZoneInfo in Model
         *
         * @Html.DropDownList("TimeZones",Model.TimeZones.ToSelectListItems())
         *
         * With text
         * @Html.DropDownList("TimeZones2",Model.TimeZones.ToSelectListItems(t => t.DaylightName))
         *
         * With text and value
         * @Html.DropDownList("TimeZones3",Model.TimeZones.ToSelectListItems(t => t.DaylightName,t => t.Id))
         *
         * With text, value and selected expression
         * @Html.DropDownList("TimeZones3",Model.TimeZones.ToSelectListItems(t => t.DaylightName,t => t.Id,t=>t.DaylightName == "Central America Daylight Time"))
         */

        /// <summary>
        /// Creates an <see cref="IEnumerable<SelectListItem>"/> base on the IEnumerable<T> items
        /// </summary>
        public static IEnumerable<SelectListItem> ToSelectListItems<T>(this IEnumerable<T> items,
            Func<T, string> textExpression = null,
            Func<T, string> valueExpression = null,
            Func<T, bool> selectedExpression = null)
        {
            foreach (T item in items)
            {
                SelectListItem li = new SelectListItem();
                if (textExpression != null)
                    li.Text = textExpression(item);
                else
                    li.Text = item.ToString();

                if (valueExpression != null)
                    li.Value = valueExpression(item);

                if (selectedExpression != null)
                    li.Selected = selectedExpression(item);

                yield return li;
            }
        }
    }
}