吉米.NET

讓enum變成view來使用好像滿頻繁的，記錄一下擴充dropdownlist

public static MvcHtmlString DropDownEnumList<T>(this HtmlHelper htmlHelper, string name, string selectValue)
            where T : struct, IConvertible
        {
            return htmlHelper.DropDownList(name, GetSelectEnumListItems<T>(selectValue));
        }

        public static MvcHtmlString DropDownEnumList<T>(this HtmlHelper htmlHelper, string name,string selectValue, object htmlAttributes)
            where T : struct, IConvertible 
        {
            return htmlHelper.DropDownList(name, GetSelectEnumListItems<T>(selectValue), htmlAttributes);
        }

        public static MvcHtmlString DropDownEnumList<T>(this HtmlHelper htmlHelper, string name,string selectValue, IDictionary<string, object> htmlAttributes)
            where T : struct, IConvertible 
        {
            return htmlHelper.DropDownList(name, GetSelectEnumListItems<T>(selectValue), htmlAttributes);
        }

        public static MvcHtmlString DropDownEnumList<T>(this HtmlHelper htmlHelper, string name,string selectValue, string optionLabel)
            where T : struct, IConvertible 
        {
            return htmlHelper.DropDownList(name, GetSelectEnumListItems<T>(selectValue), optionLabel);
        }

        public static MvcHtmlString DropDownEnumList<T>(this HtmlHelper htmlHelper, string name, string selectValue, string optionLabel, object htmlAttributes)
            where T : struct, IConvertible 
        {
            return htmlHelper.DropDownList(name, GetSelectEnumListItems<T>(selectValue), optionLabel, htmlAttributes);
        }

        public static MvcHtmlString DropDownEnumList<T>(this HtmlHelper htmlHelper, string name,string selectValue, string optionLabel, IDictionary<string, object> htmlAttributes)
            where T : struct, IConvertible 
        {
            return htmlHelper.DropDownList(name, GetSelectEnumListItems<T>(selectValue), optionLabel, htmlAttributes);
        }

        public static IEnumerable<SelectListItem> GetSelectEnumListItems<T>(string selectValue)
            where T : struct, IConvertible
        {
            List<SelectListItem> items = new List<SelectListItem>();
            foreach (var e in Enum.GetNames(typeof(T)))
            {
                string val = ((int)Enum.Parse(typeof(T), e)).ToString();
                var selectlistItem = new SelectListItem() { Text = e, Value = val };
                if (!string.IsNullOrWhiteSpace(selectValue) && (val == selectValue))
                {
                    selectlistItem.Selected = true;
                }
                items.Add(selectlistItem);
            }
            return items;
        }