ASP.NET泛型类型转换

        public List<T> RetrieveHtmlInput(HtmlForm form)
        {
            List<T> list = new List<T>();

            foreach (Control ctrl in form.Controls)
            {
                if (ctrl is T)
                {
                    T control = (T)Convert.ChangeType(ctrl, typeof(T));
                    list.Add(control);
                }
            }
            return list;
        }

T control = (T)Convert.ChangeType(ctrl, typeof(T));